Nickel-Catalyzed Site-Selective C−H Bond Difluoroalkylation · China, Tel:+86-561-3802-069,...
Transcript of Nickel-Catalyzed Site-Selective C−H Bond Difluoroalkylation · China, Tel:+86-561-3802-069,...
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Supporting Information
Nickel-Catalyzed Site-Selective C−H Bond Difluoroalkylation
of 8-Aminoquinolines on the C5-Position
Hao Chen,† Pinhua Li,*
† Min Wang, and Lei Wang*
†‡
† Department of Chemistry, Huaibei Normal University, Huaibei, Anhui 235000, P R
China, Tel:+86-561-3802-069, Fax:+86-561-3090-518, E-mail: [email protected]
‡ State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic
Chemistry, Chinese Academy of Sciences, Shanghai 200032, P R China
Table of Contents for Supporting Information
1. General considerations…………………………………………………………….…….2
2. General procedure for the reaction....................................................................................2
3. Free radical-trapping experiment.......................................................................................3
4. Characterization data for the products…………….….……………………………….....4
5. 1H and
13C NMR spectra of the products………….….………………………………....27
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1. General considerations
All 1H NMR and
13C NMR spectra were recorded on a 400 MHz Bruker FT-NMR
spectrometers (400 MHz or 100 MHz, respectively). All chemical shifts are given as δ
value (ppm) with reference to tetramethylsilane (TMS) as an internal standard. The peak
patterns are indicated as follows: s, singlet; d, doublet; t, triplet; m, multiplet; q, quartet.
The coupling constants, J, are reported in Hertz (Hz). High resolution mass
spectroscopy data of the product were collected on a Waters Micromass GCT instrument.
High resolution mass spectroscopy data of the product were collected on an Agilent
Technologies 6540 UHD Accurate-Mass Q-TOF LC/MS (ESI).
8-Aminoquinoline amides were prepared according to the literature (Zaitsev, V.;
Shabashov, D.; Daugulis, O. J. Am. Chem. Soc. 2005, 127, 13154–13155). The
chemicals and solvents were purchased from commercial suppliers either from Aldrich
(USA) or Shanghai Chemical Company (China) without further purification. All the
solvents were dried and freshly distilled prior to use. All the reactions were carried out
under air atmosphere. Products were purified by flash chromatography on 100–200
mesh silica gels, SiO2.
2. General procedure for the reaction
8-Aminoquinoline amide (1a, 0.25 mmol), BrCF2CO2Et (2a, 0.50 mmol),
Ni(dppf)Cl2 (10 mol %), KHCO3 (2 equiv) and 1,4-dioxane (1.0 mL) was added to a 15
mL Schlenk tube at the preheated oil bath under 150 oC for 12 h . After the reaction was
completed, the reaction mixture was cooled down to room temperature and the reaction
solution was concentrated under reduced pressure to yield crude product, which was
purified by flash chromatography (silica gel, petroleum ether/ethyl acetate = 9:1) to give
the desired product 3a in 80 % yield as a white solid.
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3. Free radical-trapping experiment
8-Aminoquinoline amide (1a, 0.25 mmol), BrCF2CO2Et (2a, 0.50 mmol),
Ni(dppf)Cl2 (0.025 mmol, 10 mol %), KHCO3 (2 equiv), 1,4-dioxane (1.0 mL) and
(2,2,6,6-tetramethylpiperidine)-1-oxyl (TEMPO, 0.5 mmol, 2.0 equiv) were added to a
15 mL Schlenk tube at the preheated oil bath under 150 oC for 12 h . After the reaction
was completed, no desired product 3a was detected by TLC, as well as HPLC-HRMS,
indicating that the reaction was completely inhibited. Meanwhile, a free radical-trapping
adduct of functionalized difluoromethyl radical with TEMPO was observed with
HPLC-HRMS analysis of the reaction solution (Figure S1).
Figure S1. HRMS analysis of the adduct of functionalized difluoromethyl radical with TEMPO
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4. Characterization data for the products
Ethyl 2-(8-benzamidoquinolin-5-yl)-2,2-difluoroacetate (3a). White solid (74.0 mg,
80% yield), m.p. 103–104 °C. 1H NMR (400 MHz, CDCl3) δ: 10.90 (s, 1H), 8.96 (d, J =
8.3 Hz, 1H), 8.88 (d, J = 3.9 Hz, 1H), 8.68 (d, J = 8.7 Hz, 1H), 8.07 (d, J = 6.9 Hz, 2H),
7.94 (d, J = 8.3 Hz, 1H), 7.617.53 (m, 4H), 4.29 (q, J = 7.1 Hz, 2H), 1.25 (t, J = 7.2 Hz,
3H); 13
C NMR (100 MHz, CDCl3) δ: 165.52, 164.16 (t, J = 35.0 Hz), 148.41, 138.58,
137.44, 134.66, 133.73 (t, J = 3.7 Hz), 132.10, 128.82, 127.28, 126.84 (t, J = 9.0 Hz),
124.72 (t, J = 2.1 Hz), 122.45, 122.09 (t, J = 24.4 Hz), 114.70, 114.03 (t, J = 251.1 Hz),
63.34, 13.78. HRMS (ESI) ([M+H]+) Calcd. For C20H17F2N2O3: 371.1202, Found:
371.1201.
Ethyl 2,2-difluoro-2-(8-(4-methylbenzamido)quinolin-5-yl)acetate (3b). White solid
(75.9 mg, 79% yield), m.p. 158–159 °C. 1H NMR (400 MHz, CDCl3) δ: 10.87 (s, 1H),
8.96 (d, J = 8.2 Hz, 1H), 8.87 (d, J = 3.5 Hz, 1H), 8.68 (d, J = 8.6 Hz, 1H), 7.96 (d, J =
7.9 Hz, 2H), 7.91 (d, J = 8.3 Hz, 1H), 7.55 (dd, J1 = 4.1 Hz, J2 = 8.6 Hz, 1H), 7.33 (d, J
= 7.8 Hz, 2H), 4.29 (q, J = 7.0 Hz, 2H), 2.44 (s, 3H), 1.25 (t, J = 7.1 Hz, 3H); 13
C NMR
(100 MHz, CDCl3) δ: 165.50, 164.18 (t, J = 35.0 Hz), 148.36, 142.68, 138.59, 137.57,
133.71 (t, J = 3.7 Hz), 131.86, 129.48, 127.30, 126.86 (t, J = 9.0 Hz), 124.73 (t, J = 2.0
Hz), 122.40, 121.90 (t, J = 24.4 Hz), 114.62, 114.06 (t, J = 251.1 Hz), 63.32, 21.46,
13.78. HRMS (ESI) ([M+H]+) Calcd. For C21H19F2N2O3: 385.1358, Found: 385.1354.
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Ethyl 2,2-difluoro-2-(8-(4-methoxybenzamido)quinolin-5-yl)acetate (3c). White
solid (77.0 mg, 77% yield), m.p. 148149 °C. 1H NMR (400 MHz, CDCl3) δ: 10.83 (s,
1H), 8.94 (d, J = 8.2 Hz, 1H), 8.87 (d, J = 3.6 Hz, 1H), 8.68 (d, J = 8.6 Hz, 1H), 8.04 (d,
J = 8.7 Hz, 2H), 7.91 (d, J = 8.3 Hz, 1H), 7.55 (dd, J1 = 4.1 Hz, J2 = 8.7 Hz, 1H), 7.03
(d, J = 8.7 Hz, 2H), 4.29 (q, J = 7.0 Hz, 2H), 3.88 (s, 3H), 1.25 (t, J = 7.1 Hz, 3H); 13
C
NMR (100 MHz, CDCl3) δ: 165.06, 164.20 (t, J = 35.0 Hz), 162.76, 148.33, 138.59,
137.65, 133.73 (t, J = 3.7 Hz), 129.22, 126.94, 126.89 (t, J = 8.9 Hz), 124.74 (t, J = 2.0
Hz), 122.40, 121.75 (t, J = 24.4 Hz), 114.51, 114.08 (t, J = 251.1 Hz), 114.04, 63.33,
55.42, 13.78. HRMS (ESI) ([M+H]+) Calcd. For C21H19F2N2O4: 401.1307, Found:
401.1305.
Ethyl 2-(8-(4-(tert-butyl)benzamido)quinolin-5-yl)-2,2-difluoroacetate (3d). White
solid (88.4 mg, 83% yield), m.p. 129–130 °C. 1H NMR (400 MHz, CDCl3) δ: 10.90 (s,
1H), 8.97 (d, J = 8.2 Hz, 1H), 8.88 (d, J = 3.1 Hz, 1H), 8.69 (d, J = 8.3 Hz, 1H), 8.02 (d,
J = 8.3 Hz, 2H), 7.92 (d, J = 8.3 Hz, 1H), 7.597.54 (m, 3H), 4.29 (q, J = 7.1 Hz, 2H),
1.38 (s, 9H), 1.25 (t, J = 7.2 Hz, 3H); 13
C NMR (100 MHz, CDCl3) δ: 165.57, 164.21 (t,
J = 35.0 Hz), 155.77, 148.37, 138.64, 137.63, 133.76 (t, J = 3.7 Hz), 131.91, 127.21,
126.91 (t, J = 8.9 Hz), 125.81, 124.78 (t, J = 2.0 Hz), 122.43, 121.94 (t, J = 24.4 Hz),
114.66, 114.08 (t, J = 251.0 Hz), 63.33, 35.02, 31.14, 13.81. HRMS (ESI) ([M+H]+)
Calcd. For C24H25F2N2O3: 427.1828, Found: 427.1825.
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Ethyl 2-(8-([1,1'-biphenyl]-4-ylcarboxamido)quinolin-5-yl)-2,2-difluoroacetate (3e).
White solid (78.1 mg, 70% yield), m.p. 115–118 °C. 1H NMR (400 MHz, CDCl3) δ:
10.96 (s, 1H), 8.99 (d, J = 8.2 Hz, 1H), 8.90 (d, J = 3.2 Hz, 1H), 8.70 (d, J = 8.5 Hz,
1H), 8.15 (d, J = 8.2 Hz, 2H), 7.93 (d, J = 8.3 Hz, 1H), 7.77 (d, J = 8.2 Hz, 2H), 7.65 (d,
J = 7.4 Hz, 2H), 7.57 (dd,J1 = 4.2 Hz, J2 = 8.7 Hz, 1H), 7.507.46 (m, 2H), 7.427.38
(m, 1H), 4.29 (q, J = 7.1 Hz, 2H), 1.26 (t, J = 7.1 Hz, 3H); 13
C NMR (100 MHz, CDCl3)
δ: 165.25, 164.19 (t, J = 35.0 Hz), 148.43, 144.93, 139.85, 138.61, 137.47, 133.78 (t, J
= 3.7 Hz), 133.29, 128.94, 128.11, 127.86, 127.47, 127.19, 126.89 (t, J = 9.0 Hz),
124.76 (t, J = 2.0 Hz), 122.48, 122.08 (t, J = 24.4 Hz), 114.74, 114.05 (t, J = 251.1 Hz),
63.37, 13.81. HRMS (ESI) ([M+H]+) Calcd. For C26H21F2N2O3: 447.1515, Found:
447.1513.
Ethyl 2,2-difluoro-2-(8-(4-fluorobenzamido)quinolin-5-yl)acetate (3f). White solid
(79.6 mg, 82% yield), m.p. 122–123 °C. 1H NMR (400 MHz, CDCl3) δ: 10.85 (s, 1H),
8.93 (d, J = 8.3 Hz, 1H), 8.88 (d, J = 3.1 Hz, 1H), 8.69 (d, J = 8.4 Hz, 1H), 8.108.07
(m, 2H), 7.92 (d, J = 8.3 Hz, 1H), 7.57 (dd, J1 = 4.2 Hz, J2 = 8.7 Hz, 1H), 7.22 (t, J =
8.5 Hz, 2H), 4.29 (q, J = 7.1 Hz, 2H), 1.26 (t, J = 7.2 Hz, 3H); 13
C NMR (100 MHz,
CDCl3) δ: 165.10 (d, J = 251.6 Hz), 164.40, 164.16 (t, J = 35.0 Hz), 148.45, 138.54,
137.29, 133.82 (t, J = 3.7 Hz), 130.86 (d, J = 3.1 Hz), 129.72 (d, J = 9.0 Hz), 126.84 (t,
J = 9.0 Hz), 124.74 (t, J = 2.1 Hz), 122.51, 122.24 (t, J = 24.4 Hz), 115.92 (d, J = 21.9
Hz), 114.73, 114.01 (t, J = 251.2 Hz), 63.38, 13.79. HRMS (ESI) ([M+H]+) Calcd. For
C20H16F3N2O3: 389.1108, Found: 389.1104.
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Ethyl 2-(8-(4-chlorobenzamido)quinolin-5-yl)-2,2-difluoroacetate (3g). White solid
(87.9 mg, 87% yield), m.p. 146–147 °C. 1H NMR (400 MHz, CDCl3) δ: 10.86 (s, 1H),
8.92 (d, J = 8.3 Hz, 1H), 8.88 (d, J = 3.2, 1H), 8.69 (d, J = 8.5 Hz, 1H), 8.00 (d, J = 8.5
Hz, 2H), 7.92 (d, J = 8.3 Hz, 1H), 7.57 (dd, J1 = 4.2 Hz, J2 = 8.7 Hz, 1H), 7.52 (d, J =
8.5 Hz, 2H), 4.29 (q, J = 7.1 Hz, 2H), 1.26 (t, J = 7.2 Hz, 3H); 13
C NMR (100 MHz,
CDCl3) δ: 164.42, 164.14 (t, J = 34.9 Hz), 148.49, 138.54, 138.48, 137.18, 133.84 (t, J
= 3.7 Hz), 133.04, 129.12, 128.73, 126.82 (t, J = 8.9 Hz), 124.75 (t, J = 2.1 Hz), 122.53,
122.36 (t, J = 24.4 Hz), 114.81, 113.99 (t, J = 251.2 Hz), 63.39, 13.80. HRMS (ESI)
([M+H]+) Calcd. For C20H16ClF2N2O3: 405.0812, Found: 405.0810.
Ethyl 2-(8-(4-bromobenzamido)quinolin-5-yl)-2,2-difluoroacetate (3h). White solid
(98.6 mg, 88% yield), m.p. 137–138 °C. 1H NMR (400 MHz, CDCl3) δ: 10.87 (s, 1H),
8.93 (d, J = 8.2 Hz, 1H), 8.89 (d, J = 3.2 Hz, 1H), 8.69 (d, J = 8.3 Hz, 1H), 7.957.91
(m, 3H), 7.69 (d, J = 8.4 Hz, 2H), 7.58 (dd, J1 = 4.1 Hz, J2 = 8.7 Hz, 1H), 4.29 (q, J =
7.1 Hz, 2H), 1.26 (t, J = 7.1 Hz, 3H); 13
C NMR (100 MHz, CDCl3) δ: 164.56, 164.15 (t,
J = 34.9 Hz), 148.51, 138.57, 137.20, 133.87 (t, J = 3.7 Hz), 133.56, 132.13, 128.91,
126.99, 126.85 (t, J = 9.0 Hz), 124.78 (t, J = 2.0 Hz), 122.55, 122.42 (t, J = 24.5 Hz),
114.86, 114.01 (t, J = 251.2 Hz), 63.39, 13.82. HRMS (ESI) ([M+H]+) Calcd. For
C20H16BrF2N2O3: 449.0307, Found: 449.0305.
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Ethyl 2,2-difluoro-2-(8-(4-iodobenzamido)quinolin-5-yl)acetate (3i). White solid
(100.4 mg, 81% yield), m.p. 117–118 °C. 1H NMR (400 MHz, CDCl3) δ: 10.86 (s, 1H),
8.92 (d, J = 8.2 Hz, 1H), 8.88 (d, J = 3.2 Hz, 1H), 8.69 (d, J = 8.5 Hz, 1H), 7.937.89
(m, 3H), 7.78 (d, J = 8.3 Hz, 2H), 7.57 (dd, J1 = 4.2 Hz, J2 = 8.7 Hz, 1H), 4.29 (q, J =
7.2 Hz, 2H), 1.26 (t, J = 7.1 Hz, 3H); 13
C NMR (100 MHz, CDCl3) δ: 164.76, 164.15 (t,
J = 34.9 Hz), 148.50, 138.56, 138.12, 137.18, 134.13, 133.86 (t, J = 3.8 Hz), 128.85,
126.84 (t, J = 8.9 Hz), 124.77 (t, J = 2.2 Hz), 122.55, 122.40 (t, J = 24.4 Hz), 114.85,
114.00 (t, J = 250.9 Hz), 99.32, 63.39, 13.82. HRMS (ESI) ([M+H]+) Calcd. For
C20H16IF2N2O3: 497.0168, Found: 497.0172.
Ethyl 2,2-difluoro-2-(8-(4-(trifluoromethyl)benzamido)quinolin-5-yl)acetate (3j).
White solid (99.7 mg, 91% yield), m.p. 159–160 °C. 1H NMR (400 MHz, CDCl3) δ:
10.95 (s, 1H), 8.95 (d, J = 8.2 Hz, 1H), 8.89 (d, J = 3.5 Hz, 1H), 8.71 (d, J = 8.6 Hz,
1H), 8.19 (d, J = 8.0 Hz, 2H), 7.94 (d, J = 8.2 Hz, 1H), 7.83 (d, J = 8.0 Hz, 2H), 7.59
(dd, J1 = 4.1 Hz, J2 = 8.6 Hz, 1H), 4.30 (q, J = 7.1 Hz, 2H), 1.26 (t, J = 7.1 Hz, 3H); 13
C
NMR (100 MHz, CDCl3) δ: 164.18, 164.13 (t, J = 34.9 Hz), 148.59, 138.54, 137.94 (d,
J = 1.0 Hz), 136.99, 134.26, 133.93, 133.90 (t, J = 3.8 Hz), 133.60, 133.28, 127.80,
126.80 (t, J = 9.0 Hz), 125.94 (q, J1 = 3.7 Hz, J2 = 7.4 Hz), 124.99, 124.77 (t, J = 2.1
Hz), 122.70 (t, J = 24.4 Hz), 122.63, 122.28, 114.98, 113.95 (t, J = 251.2 Hz), 63.44,
13.81. HRMS (ESI) ([M+H]+) Calcd. For C21H16F5N2O3: 439.1076, Found: 439.1076.
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Ethyl 2,2-difluoro-2-(8-(3-methylbenzamido)quinolin-5-yl)acetate (3k). White solid
(80.7 mg, 84% yield), m.p. 112–114 °C. 1H NMR (400 MHz, CDCl3) δ: 10.87 (s, 1H),
8.97 (d, J = 8.2 Hz, 1H), 8.89 (d, J = 3.5 Hz, 1H), 8.69 (d, J = 8.6 Hz, 1H), 7.92 (d, J =
8.3 Hz, 1H), 7.887.84 (m, 2H), 7.56 (dd, J1 = 4.2 Hz, J2 = 8.7 Hz, 1H), 7.457.39 (m,
2H), 4.29 (q, J = 7.1 Hz, 2H), 2.48 (s, 3H), 1.26 (t, J = 7.1 Hz, 3H); 13
C NMR (100
MHz, CDCl3) δ: 165.79, 164.19 (t, J = 35.0 Hz), 148.42, 138.76, 138.63, 137.54, 134.71,
133.75 (t, J = 3.7 Hz), 132.88, 128.68, 128.08, 126.88 (t, J = 9.0 Hz), 124.76 (t, J = 2.0
Hz), 124.23, 122.43, 122.04 (t, J = 24.4 Hz), 114.73, 114.07 (t, J = 251.1 Hz), 63.34,
21.41, 13.80. HRMS (ESI) ([M+H]+) Calcd. For C21H19F2N2O3: 385.1358, Found:
385.1356.
Ethyl 2,2-difluoro-2-(8-(3-methoxybenzamido)quinolin-5-yl)acetate (3l). White solid
(82.0 mg, 82% yield), m.p. 102–103 °C. 1H NMR (400 MHz, CDCl3) δ: 10.88 (s, 1H),
8.96 (d, J = 4.1 Hz, 1H), 8.888.87 (m, 1H), 8.68 (d, J = 8.1 Hz, 1H), 7.92 (d, J = 8.3
Hz, 1H), 7.627.61 (m, 2H), 7.55 (dd, J1 = 4.2 Hz, J2 = 8.6 Hz, 1H), 7.477.43 (m, 1H),
7.137.11 (m, 1H), 4.29 (q, J = 7.1 Hz, 2H), 3.90 (s, 3H), 1.26 (t, J = 7.1 Hz, 3H); 13
C
NMR (100 MHz, CDCl3) δ: 165.35, 164.15 (t, J = 35.0 Hz), 160.04, 148.43, 138.58,
137.42, 136.14, 133.71 (t, J = 3.7 Hz), 129.80, 126.82 (t, J = 8.9 Hz), 124.72 (t, J = 2.0
Hz), 122.44, 122.12 (t, J = 24.4 Hz), 119.04, 118.20, 114.70, 114.03 (t, J = 251.1 Hz),
112.78, 63.34, 55.44, 13.78. HRMS (ESI) ([M+H]+) Calcd. For C21H19F2N2O4:
401.1307, Found: 401.1308.
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Ethyl 2,2-difluoro-2-(8-(3-fluorobenzamido)quinolin-5-yl)acetate (3m). White solid
(66.0 mg, 68% yield), m.p. 124–126 °C. 1H NMR (400 MHz, CDCl3) δ: 10.87 (s, 1H),
8.92 (d, J = 8.2 Hz, 1H), 8.88 (d, J = 3.2 Hz, 1H), 8.69 (d, J = 8.5 Hz, 1H), 7.92 (d, J =
8.3 Hz, 1H), 7.83 (d, J = 7.7 Hz, 1H), 7.76 (d, J = 9.2 Hz, 1H), 7.57 (dd, J1 = 4.2 Hz, J2
= 8.7 Hz, 1H), 7.537.49 (m, 1H), 7.317.26 (m, 1H), 4.30 (q, J = 7.1 Hz, 2H), 1.26 (t,
J = 7.1 Hz, 3H); 13
C NMR (100 MHz, CDCl3) δ: 164.11 (t, J = 34.9 Hz), 164.09 (d, J =
2.6 Hz), 162.93 (d, J = 246.6 Hz), 148.51, 138.53, 137.11, 136.92 (d, J = 6.8 Hz),
133.80 (t, J = 3.8 Hz), 130.49 (d, J = 7.8 Hz), 126.78 (t, J = 9.0 Hz), 124.73 (t, J = 2.1
Hz), 128.70 (d, J = 3.0 Hz), 122.53, 122.45 (t, J = 24.4 Hz), 119.11 (d, J = 21.2 Hz),
114.84, 114.70 (d, J = 22.9 Hz), 113.99 (t, J = 251.2 Hz), 63.37, 13.78. HRMS (ESI)
([M+H]+) Calcd. For C20H16F3N2O3: 389.1108, Found: 389.1106.
Ethyl 2-(8-(3-chlorobenzamido)quinolin-5-yl)-2,2-difluoroacetate (3n). White solid
(73.7 mg, 73% yield), m.p. 133–135 °C. 1H NMR (400 MHz, CDCl3) δ: 10.86 (s, 1H),
8.93 (d, J = 8.2 Hz, 1H), 8.908.89 (m, 1H), 8.708.68 (m, 1H), 8.04 (s, 1H), 7.937.91
(m, 2H), 7.597.55 (m, 2H), 7.517.47 (m, 1H), 4.30 (q, J = 7.1 Hz, 2H), 1.26 (t, J =
7.2 Hz, 3H); 13
C NMR (100 MHz, CDCl3) δ: 164.13 (t, J = 34.9 Hz), 164.11, 148.55,
138.56, 137.11, 136.47, 135.13, 133.84 (t, J = 3.7 Hz), 132.14, 130.12, 127.74, 126.80
(t, J = 8.9 Hz), 125.25, 124.75 (t, J = 2.0 Hz), 122.55, 122.51 (t, J = 24.4 Hz), 114.92,
113.99 (t, J = 251.2 Hz), 63.39, 13.80. HRMS (ESI) ([M+H]+) Calcd. For
C20H16ClF2N2O3: 405.0812, Found: 405.0815.
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Ethyl 2-(8-(3-bromobenzamido)quinolin-5-yl)-2,2-difluoroacetate (3o). White solid
(80.6 mg, 72% yield), m.p. 127–128 °C. 1H NMR (400 MHz, CDCl3) δ: 10.82 (s, 1H),
8.928.88 (m, 2H), 8.68 (d, J = 8.5 Hz, 1H), 8.19 (s, 1H), 7.96 (d, J = 7.8 Hz, 1H), 7.91
(d, J = 8.3 Hz, 1H), 7.70 (d, J = 7.9 Hz, 1H), 7.56 (dd, J1 = 4.2 Hz, J2 = 8.7 Hz, 1H),
7.437.39 (m, 1H), 4.30 (q, J = 7.1 Hz, 2H), 1.26 (t, J = 7.1 Hz, 3H); 13
C NMR (100
MHz, CDCl3) δ: 164.10 (t, J = 34.9 Hz), 163.92, 148.53, 138.51, 137.07, 136.61, 135.04,
133.80 (t, J = 3.7 Hz), 130.64, 130.31, 126.77 (t, J = 9.0 Hz), 125.65, 124.71 (t, J = 2.0
Hz), 123.09, 122.53, 122.47 (t, J = 24.4 Hz), 114.89, 113.97 (t, J = 251.2 Hz), 63.37,
13.79. HRMS (ESI) ([M+H]+) Calcd. For C20H16BrF2N2O3: 449.0307, Found:
449.0304.
Ethyl 2,2-difluoro-2-(8-(3-(trifluoromethyl)benzamido)quinolin-5-yl)acetate (3p).
White solid (84.3 mg, 77% yield), m.p. 114–116 °C. 1H NMR (400 MHz, CDCl3) δ:
10.93 (s, 1H), 8.94 (d, J = 8.2 Hz, 1H), 8.90 (d, J = 3.2 Hz, 1H), 8.70 (d, J = 8.6 Hz,
1H), 8.34 (s, 1H), 8.24 (d, J = 7.6 Hz, 1H), 7.93 (d, J = 8.2 Hz, 1H), 7.86 (d, J = 7.6 Hz,
1H), 7.727.68 (m, 1H), 7.58 (dd, J1 = 4.1 Hz, J2 = 8.6 Hz, 1H), 4.30 (q, J = 7.1 Hz,
2H), 1.27 (t, J = 7.1 Hz, 3H); 13
C NMR (100 MHz, CDCl3) δ: 164.13 (t, J = 34.8 Hz),
164.01, 148.62, 138.57, 137.02, 135.59, 133.89 (t, J = 3.7 Hz), 131.59 (q, J1 = 32.6 Hz,
J2 = 65.3 Hz), 130.26 (d, J = 1.0 Hz), 129.48, 128.66 (q, J1 = 3.5 Hz, J2 = 7.1 Hz),
126.80 (t, J = 9.0 Hz), 125.05, 124.78 (t, J = 1.9 Hz), 124.61 (q, J1 = 3.8 Hz, J2 = 7.6
Hz), 122.70 (t, J = 24.4 Hz), 122.60, 122.34, 115.00, 114.00 (t, J = 251.4 Hz), 63.41,
13.80. HRMS (ESI) ([M+H]+) Calcd. For C21H16F5N2O3: 439.1076, Found: 439.1075.
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Ethyl 2,2-difluoro-2-(8-(2-methylbenzamido)quinolin-5-yl)acetate (3q). White solid
(74.9 mg, 78% yield), m.p. 126–128 °C. 1H NMR (400 MHz, CDCl3) δ: 10.40 (s, 1H),
8.98 (d, J = 8.2 Hz, 1H), 8.80 (d, J = 3.9 Hz, 1H), 8.67 (d, J = 8.6 Hz, 1H), 7.93 (d, J =
8.3 Hz, 1H), 7.68 (d, J = 7.5 Hz, 1H), 7.52 (dd, J1 = 4.1 Hz, J2 = 8.7 Hz, 1H), 7.417.37
(m, 1H), 7.327.28 (m, 2H), 4.29 (q, J = 7.1 Hz, 2H), 2.60 (s, 3H), 1.25 (t, J = 7.1 Hz,
3H); 13
C NMR (100 MHz, CDCl3) δ: 168.12, 164.06 (t, J = 35.0 Hz), 148.33, 138.34,
137.52, 136.74, 135.97, 133.57 (t, J = 3.7 Hz), 131.38, 130.50, 127.11, 126.70 (t, J =
9.0 Hz), 125.95, 124.64 (t, J = 2.1 Hz), 122.37, 122.10 (t, J = 24.4 Hz), 114.55, 113.97
(t, J = 251.1 Hz), 63.28, 20.08, 13.70. HRMS (ESI) ([M+H]+) Calcd. For C21H19F2N2O3:
385.1358, Found: 385.1362.
Ethyl 2,2-difluoro-2-(8-(2-methoxybenzamido)quinolin-5-yl)acetate (3r). White
solid (75.0 mg, 75% yield), m.p. 115–116 °C. 1H NMR (400 MHz, CDCl3) δ: 12.47 (s,
1H), 9.04 (d, J = 8.2 Hz, 1H), 8.84 (d, J = 3.3 Hz, 1H), 8.63 (d, J = 8.6 Hz, 1H), 8.30 (d,
J = 7.8 Hz, 1H), 7.89 (d, J = 8.3 Hz, 1H), 7.517.45 (m, 2H), 7.127.08 (m, 1H), 7.02
(d, J = 8.3 Hz, 1H), 4.28 (q, J = 7.1 Hz, 2H), 4.13 (s, 3H), 1.24 (t, J = 7.1 Hz, 3H); 13
C
NMR (100 MHz, CDCl3) δ: 164.21 (t, J = 35.1 Hz), 163.81, 157.71, 148.25, 139.00,
138.69, 133.37, 133.36 (t, J = 3.8 Hz), 132.32, 126.92 (t, J = 8.9 Hz), 124.74 (t, J = 2.0
Hz), 122.13, 121.86, 121.61 (t, J = 24.3 Hz), 121.22, 115.32, 114.16 (t, J = 250.8 Hz),
111.56, 63.26, 55.99, 13.75. HRMS (ESI) ([M+H]+) Calcd. For C21H19F2N2O4:
401.1307, Found: 401.1304.
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Ethyl 2,2-difluoro-2-(8-(2-fluorobenzamido)quinolin-5-yl)acetate (3s). White solid
(82.5 mg, 85% yield), m.p. 85–87 °C. 1H NMR (400 MHz, CDCl3) δ: 11.33 (d, J = 12.5
Hz, 1H), 9.00 (d, J = 8.3 Hz, 1H), 8.918.90 (m, 1H), 8.698.66 (m, 1H), 8.238.19 (m,
1H), 7.92 (d, J = 8.3 Hz, 1H), 7.577.53 (m, 2H), 7.367.32 (m, 1H), 7.267.22 (m,
1H), 4.29 (q, J = 7.2 Hz, 2H), 1.25 (t, J = 7.2 Hz, 3H); 13
C NMR (100 MHz, CDCl3) δ:
164.19 (t, J = 35.0 Hz), 161.88 (d, J = 3.3 Hz), 160.61 (d, J = 247.9 Hz), 148.61, 138.68
(d, J = 1.0 Hz), 137.76, 133.89 (d, J = 9.2 Hz), 133.61 (t, J = 3.7 Hz), 132.09 (d, J = 1.9
Hz), 126.80 (t, J = 9.0 Hz), 124.92 (t, J = 3.4 Hz), 124.75 (t, J = 2.1 Hz), 122.48 (t, J =
24.4 Hz), 122.46, 121.74 (d, J = 11.4 Hz), 116.38 (d, J = 24.3 Hz), 115.46, 114.05 (t, J =
251.1 Hz), 63.37, 13.81. HRMS (ESI) ([M+H]+) Calcd. For C20H16F3N2O3: 389.1108,
Found: 389.1103.
Ethyl 2-(8-(2-chlorobenzamido)quinolin-5-yl)-2,2-difluoroacetate (3t). White solid
(90.9 mg, 90% yield), m.p. 165–168 °C. 1H NMR (400 MHz, CDCl3) δ: 10.70 (s, 1H),
8.99 (d, J = 8.2 Hz, 1H), 8.84 (d, J = 3.4 Hz, 1H), 8.68 (d, J = 8.6 Hz, 1H), 7.94 (d, J =
8.3 Hz, 1H), 7.837.81 (m, 1H), 7.55 (dd, J1 = 4.1 Hz, J2 = 8.7 Hz, 1H), 7.527.50 (m,
1H), 7.477.40 (m, 2H), 4.29 (q, J = 7.0 Hz, 2H), 1.26 (t, J = 7.1 Hz, 3H); 13
C NMR
(100 MHz, CDCl3) δ: 165.04, 164.16 (t, J = 35.0 Hz), 148.53, 138.53, 137.29, 135.38,
133.69 (t, J = 3.7 Hz), 131.77, 131.16, 130.58, 130.20, 127.21, 126.79 (t, J = 9.0 Hz),
124.76 (t, J = 2.1 Hz), 122.63 (t, J = 24.4 Hz), 122.49, 115.14, 113.99 (t, J = 251.2 Hz),
63.39, 13.81. HRMS (ESI) ([M+H]+) Calcd. For C20H16ClF2N2O3: 405.0812, Found:
405.0810.
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Ethyl 2,2-difluoro-2-(8-(2-(trifluoromethyl)benzamido)quinolin-5-yl)acetate (3u).
White solid (81.0 mg, 74% yield), m.p. 170–171 °C. 1H NMR (400 MHz, CDCl3) δ:
10.35 (s, 1H), 8.96 (d, J = 8.2 Hz, 1H), 8.80 (d, J = 3.2 Hz, 1H), 8.69 (d, J = 8.5 Hz,
1H), 7.94 (d, J = 8.3 Hz, 1H), 7.81 (d, J = 7.7 Hz, 1H), 7.76 (d, J = 7.4 Hz, 1H),
7.727.68 (m, 1H), 7.667.62 (m, 1H), 7.54 (dd, J1 = 4.1 Hz, J2 = 8.7 Hz, 1H), 4.29 (q,
J = 7.1 Hz, 2H), 1.27 (t, J = 7.1 Hz, 3H); 13
C NMR (100 MHz, CDCl3) δ: 166.10,
164.14 (t, J = 34.9 Hz), 148.51, 138.36, 137.17, 135.80 (q, J1 = 2.2 Hz, J2 = 4.3 Hz),
133.77 (t, J = 3.8 Hz), 132.21 (d, J = 1.0 Hz), 130.36, 128.48, 127.71 (q, J1 = 31.9 Hz,
J2 = 63.9 Hz), 126.79 (t, J = 9.0 Hz), 126.73 (q, J1 = 4.9 Hz, J2 = 9.9 Hz), 124.93,
124.77 (t, J = 2.1 Hz), 122.87 (t, J = 24.4 Hz), 122.53, 122.21, 115.16, 113.98 (t, J =
251.2 Hz), 63.42, 13.81. HRMS (ESI) ([M+H]+) Calcd. For C21H16F5N2O3: 439.1076,
Found: 439.1080.
Ethyl 2-(8-(3,5-dimethylbenzamido)quinolin-5-yl)-2,2-difluoroacetate (3v). White
solid (83.6 mg, 84% yield), m.p. 136–139 °C. 1H NMR (400 MHz, CDCl3) δ: 10.82 (s,
1H), 8.97 (d, J = 8.2 Hz, 1H), 8.908.89 (m, 1H), 8.68 (d, J = 8.0 Hz, 1H), 7.92 (d, J =
8.3 Hz, 1H), 7.65 (s, 2H), 7.56 (dd, J1 = 4.1 Hz, J2 = 8.7 Hz, 1H), 7.21 (s, 1H), 4.29 (q,
J = 7.1 Hz, 2H), 2.43 (s, 6H), 1.26 (t, J = 7.2 Hz, 3H); 13
C NMR (100 MHz, CDCl3) δ:
166.00, 164.19 (t, J = 35.0 Hz), 148.40, 138.64, 138.54, 137.61, 134.75, 133.75, 133.72
(t, J = 3.7 Hz), 126.88 (t, J = 9.0 Hz), 125.05, 124.75 (t, J = 2.0 Hz), 122.40, 121.95 (t, J
= 24.4 Hz), 114.73, 114.08 (t, J = 251.1 Hz), 63.33, 21.29, 13.79. HRMS (ESI) ([M+H]+)
Calcd. For C22H21F2N2O3: 399.1515, Found: 399.1517.
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Ethyl 2-(8-(3,4-dichlorobenzamido)quinolin-5-yl)-2,2-difluoroacetate (3w). White
solid (70.1 mg, 64% yield), m.p. 166–167 °C. 1H NMR (400 MHz, CDCl3) δ: 10.84 (s,
1H), 8.918.90 (m, 2H), 8.70 (d, J = 8.4 Hz, 1H), 8.15 (s, 1H), 7.93 (d, J = 8.2 Hz, 1H),
7.88 (d, J = 8.0 Hz, 1H), 7.647.57 (m, 2H), 4.30 (q, J = 6.9 Hz, 2H), 1.26 (t, J = 6.9 Hz,
3H); 13
C NMR (100 MHz, CDCl3) δ: 164.12 (t, J = 34.9 Hz), 163.24, 148.62, 138.54,
136.94, 136.71, 134.52, 133.93 (t, J = 3.7 Hz), 133.53, 130.90, 129.63, 126.81 (t, J =
9.0 Hz), 126.28, 124.79 (t, J = 2.0 Hz), 122.73 (t, J = 24.5 Hz), 122.62, 115.01, 113.98
(t, J = 251.3 Hz), 63.42, 13.83. HRMS (ESI) ([M+H]+) Calcd. For C20H15Cl2F2N2O3:
439.0422, Found: 439.0419.
Ethyl 2-(8-(1-naphthamido)quinolin-5-yl)-2,2-difluoroacetate (3x). White solid (63.0
mg, 60% yield), m.p. 156–157 °C. 1H NMR (400 MHz, CDCl3) δ: 10.60 (s, 1H), 9.09 (d,
J = 8.2 Hz, 1H), 8.78 (d, J = 3.1 Hz, 1H), 8.69 (d, J = 8.7 Hz, 1H), 8.52 (d, J = 8.0 Hz,
1H), 8.027.97 (m, 2H), 7.92 (d, J = 7.2 Hz, 2H), 7.607.51 (m, 4H), 4.30 (q, J = 7.1
Hz, 2H), 1.27 (t, J = 7.2 Hz, 3H); 13
C NMR (100 MHz, CDCl3) δ: 167.84, 164.20 (t, J =
35.0 Hz), 148.44, 138.51, 137.69, 134.16, 133.91, 133.73 (t, J = 3.7 Hz), 131.44, 130.30,
128.44, 127.43, 126.86 (t, J = 9.0 Hz), 126.58, 125.62, 125.40, 124.80, 122.47, 122.41
(t, J = 24.4 Hz), 114.94, 114.06 (t, J = 251.1 Hz), 63.39, 13.83. HRMS (ESI) ([M+H]+)
Calcd. For C24H19F2N2O3: 421.1358, Found: 421.1356.
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Ethyl 2-(8-(2-naphthamido)quinolin-5-yl)-2,2-difluoroacetate (3y). White solid (60.9
mg, 58% yield), m.p. 134–135 °C. 1H NMR (400 MHz, CDCl3) δ: 11.03 (s, 1H), 9.01 (d,
J = 8.2 Hz, 1H), 8.91 (d, J = 3.1 Hz, 1H), 8.70 (d, J = 8.3 Hz, 1H), 8.57 (s, 1H),
8.118.08 (m, 1H), 8.02 (d, J = 7.2 Hz, 1H), 7.97 (d, J = 8.6 Hz, 1H), 7.94 (d, J = 8.3
Hz, 1H), 7.89 (d, J = 7.4 Hz, 1H), 7.617.55 (m, 3H), 4.30 (q, J = 7.1 Hz, 2H), 1.26 (t, J
= 7.1 Hz, 3H); 13
C NMR (100 MHz, CDCl3) δ: 165.58, 164.20 (t, J = 35.0 Hz), 148.45,
138.64, 137.52, 135.03, 133.78 (t, J = 3.7 Hz), 132.69, 131.87, 129.18, 128.76, 128.11,
128.00, 127.76, 126.90 (t, J = 9.0 Hz), 126.87, 124.77 (t, J = 1.9 Hz), 123.55, 122.47,
122.12 (t, J = 24.4 Hz), 114.80, 114.08 (t, J = 251.1 Hz), 63.36, 13.81. HRMS (ESI)
([M+H]+) Calcd. For C24H19F2N2O3: 421.1358, Found: 421.1355.
Ethyl 2,2-difluoro-2-(8-(furan-2-carboxamido)quinolin-5-yl)acetate (3z). White
solid (43.2 mg, 48% yield), m.p. 129–130 °C. 1H NMR (400 MHz, CDCl3) δ: 10.93 (s,
1H), 8.918.89 (m, 2H), 8.68 (d, J = 8.6 Hz, 1H), 7.91 (d, J = 8.3 Hz, 1H), 7.64 (s, 1H),
7.57 (dd, J1 = 4.1 Hz, J2 = 8.6 Hz, 1H), 7.33 (d, J = 3.1 Hz, 1H), 6.60 (s, 1H), 4.29 (q, J
= 7.0 Hz, 2H), 1.26 (t, J = 7.2 Hz, 3H); 13
C NMR (100 MHz, CDCl3) δ: 164.19 (t, J =
35.0 Hz), 156.45, 148.54, 148.06, 144.77, 138.51, 137.13, 133.69 (t, J = 3.8 Hz), 126.79
(t, J = 9.0 Hz), 124.78 (t, J = 2.1 Hz), 122.48, 122.25 (t, J = 24.4 Hz), 115.63, 114.83,
114.05 (t, J = 251.2 Hz), 112.55, 63.37, 13.81. HRMS (ESI) ([M+H]+) Calcd. For
C18H15F2N2O4: 361.0994, Found: 361.0994.
Ethyl 2,2-difluoro-2-(8-(thiophene-2-carboxamido)quinolin-5-yl)acetate (3aa).
White solid (47.9 mg, 51% yield), m.p. 112–113 °C. 1H NMR (400 MHz, CDCl3) δ:
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10.74 (s, 1H), 8.888.85 (m, 2H), 8.68 (d, J = 8.5 Hz, 1H), 7.90 (d, J = 8.2 Hz, 1H),
7.83 (d, J = 3.4 Hz, 1H), 7.60 (d, J = 4.8 Hz, 1H), 7.56 (dd, J1 = 4.1 Hz, J2 = 8.7 Hz,
1H), 7.207.17 (m, 1H), 4.29 (q, J = 7.1 Hz, 2H), 1.25 (t, J = 7.1 Hz, 3H); 13
C NMR
(100 MHz, CDCl3) δ: 164.15 (t, J = 35.0 Hz), 160.08, 148.45, 139.58, 138.35, 137.21,
133.77 (t, J = 3.8 Hz), 131.34, 128.80, 127.91, 126.84 (t, J = 9.0 Hz), 124.75 (t, J = 2.0
Hz), 122.49, 122.11 (t, J = 24.4 Hz), 114.67, 114.04, (t, J = 251.1 Hz), 63.35, 13.79.
HRMS (ESI) ([M+H]+) Calcd. For C18H15F2N2O3S: 377.0766, Found: 377.0767.
Ethyl 2-(8-acetamidoquinolin-5-yl)-2,2-difluoroacetate (3ab). White solid (69.3 mg,
90% yield), m.p. 163–164 °C. 1H NMR (400 MHz, CDCl3) δ: 9.96 (s, 1H), 8.83 (d, J =
3.4 Hz, 1H), 8.79 (d, J = 8.2 Hz, 1H), 8.66 (d, J = 8.5 Hz, 1H), 7.86 (d, J = 8.3 Hz, 1H),
7.54 (dd, J1 = 4.1 Hz, J2 = 8.7 Hz, 1H), 4.28 (q, J = 7.1 Hz, 2H), 2.37 (s, 3H), 1.25 (t, J
= 7.0 Hz, 3H); 13
C NMR (100 MHz, CDCl3) δ: 168.95, 164.19 (t, J = 34.9 Hz), 148.25,
138.10, 137.38, 133.72 (t, J = 3.7 Hz), 126.83 (t, J = 9.0 Hz), 124.69 (t, J = 2.0 Hz),
122.37, 121.91 (t, J = 24.4 Hz), 114.59, 114.05 (t, J = 251.0 Hz), 63.34, 25.11, 13.80.
HRMS (ESI) ([M+H]+) Calcd. For C15H15F2N2O3: 309.1045, Found: 309.1046.
Ethyl 2-(8-butyramidoquinolin-5-yl)-2,2-difluoroacetate (3ac). White solid (79.0 mg,
94% yield), m.p. 110–111 °C. 1H NMR (400 MHz, CDCl3) δ: 9.98 (s, 1H), 8.838.81
(m, 2H), 8.678.64 (m, 1H), 7.86 (d, J = 8.3 Hz, 1H), 7.53 (dd, J1 = 4.2 Hz, J2 = 8.7 Hz,
1H), 4.28 (q, J = 7.2 Hz, 2H), 2.57 (t, J = 7.4 Hz, 2H), 1.911.81 (m, 2H), 1.25 (t, J =
7.1 Hz, 3H), 1.07 (t, J = 7.4 Hz, 3H); 13
C NMR (100 MHz, CDCl3) δ: 171.93, 164.17 (t,
J = 35.0 Hz), 148.21, 138.16, 137.41, 133.65 (t, J = 3.7 Hz), 126.82 (t, J = 9.0 Hz),
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124.67 (t, J = 2.0 Hz), 122.31, 121.74 (t, J = 24.4 Hz), 114.54, 114.04 (t, J = 251.3 Hz),
63.29, 40.09, 18.95, 13.76, 13.69. HRMS (ESI) ([M+H]+) Calcd. For C17H19F2N2O3:
337.1358, Found: 337.1362.
Ethyl 2,2-difluoro-2-(8-pivalamidoquinolin-5-yl)acetate (3ad). White solid (74.4
mg, 85% yield), m.p. 78–79 °C. 1H NMR (400 MHz, CDCl3) δ: 10.45 (s, 1H),
8.868.83 (m, 2H), 8.678.64 (m, 1H), 7.87 (d, J = 8.3 Hz, 1H), 7.54 (dd, J1 = 4.2 Hz,
J2 = 8.7 Hz, 1H), 4.27 (q, J = 7.1 Hz, 2H), 1.43 (s, 9H), 1.24 (t, J = 7.1 Hz, 3H); 13
C
NMR (100 MHz, CDCl3) δ: 177.51, 164.24 (t, J = 35.1 Hz), 148.36, 138.68, 137.63 (t, J
= 2.2 Hz), 133.70 (t, J = 3.8 Hz), 126.89 (t, J = 9.0 Hz), 124.72 (t, J = 2.1 Hz), 122.32,
121.70 (t, J = 24.4 Hz), 114.45, 114.09 (t, J = 251.0 Hz), 63.30, 40.47, 27.65, 13.80.
HRMS (ESI) ([M+H]+) Calcd. For C18H21F2N2O3: 351.1515, Found: 351.1511.
Ethyl 2,2-difluoro-2-(8-(3-phenylpropanamido)quinolin-5-yl)acetate (3ae). White
solid (84.6 mg, 85% yield), m.p. 110–112 °C. 1H NMR (400 MHz, CDCl3) δ: 9.95 (s,
1H), 8.828.79 (m, 2H), 8.64 (d, J = 8.4 Hz, 1H), 7.86 (d, J = 8.3 Hz, 1H), 7.52 (dd, J1
= 4.1 Hz, J2 = 8.7 Hz, 1H), 7.307.29 (m, 4H), 7.227.19 (m, 1H), 4.27 (q, J = 7.1 Hz,
2H), 3.14 (t, J = 7.4 Hz, 2H), 2.90 (t, J = 8.2 Hz, 2H), 1.24 (t, J = 7.1 Hz, 3H); 13
C
NMR (100 MHz, CDCl3) δ: 170.99, 164.19 (t, J = 35.0 Hz), 148.22, 140.54, 138.14,
137.29, 133.69 (t, J = 3.8 Hz), 128.57, 128.36, 126.83 (t, J = 8.9 Hz), 126.30, 124.68 (t,
J = 2.1 Hz), 122.36, 121.92 (t, J = 24.4 Hz), 114.66, 114.05 (t, J = 251.1 Hz), 63.33,
39.68, 31.31, 13.80. HRMS (ESI) ([M+H]+) Calcd. For C22H21F2N2O3: 399.1515, Found:
399.1519.
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Ethyl 2-(8-(cyclopropanecarboxamido)quinolin-5-yl)-2,2-difluoroacetate (3af).
White solid (66.8 mg, 80% yield), m.p. 158–160 °C. 1H NMR (400 MHz, CDCl3) δ:
10.18 (s, 1H), 8.82 (d, J = 3.4 Hz, 1H), 8.76 (d, J = 8.2 Hz, 1H), 8.65 (d, J = 8.6 Hz,
1H), 7.85 (d, J = 8.3 Hz, 1H), 7.52 (dd, J1 = 4.1 Hz, J2 = 8.6 Hz, 1H), 4.28 (q, J = 7.1
Hz, 2H), 1.851.79 (m, 1H), 1.24 (t, J = 7.1 Hz, 3H), 1.181.16 (m, 2H), 0.950.92 (m,
2H); 13
C NMR (100 MHz, CDCl3) δ: 172.49, 164.15 (t, J = 35.3 Hz), 148.16, 138.01,
137.49, 133.60, 126.80 (t, J = 8.9 Hz), 124.65, 122.30, 121.54 (t, J = 24.5 Hz), 114.48,
114.04 (t, J = 251.2 Hz), 63.27, 16.25, 13.74, 8.35. HRMS (ESI) ([M+H]+) Calcd. For
C17H17F2N2O3: 335.1202, Found: 335.1198.
Ethyl 2-(8-(cyclohexanecarboxamido)quinolin-5-yl)-2,2-difluoroacetate (3ag).
White solid (67.7 mg, 72% yield), m.p. 149–153 °C. 1H NMR (400 MHz, CDCl3) δ:
10.07 (s, 1H), 8.848.82 (m, 2H), 8.65 (d, J = 8.5 Hz, 1H), 7.86 (d, J = 8.3 Hz, 1H),
7.53 (dd, J1 = 4.1 Hz, J2 = 8.6 Hz, 1H), 4.27 (q, J = 7.0 Hz, 2H), 2.522.46 (m, 1H),
2.102.07 (m, 2H), 1.891.86 (m, 2H), 1.751.73 (m, 1H), 1.681.60 (m, 2H),
1.441.28 (m, 3H), 1.24 (t, J = 7.1 Hz, 3H); 13
C NMR (100 MHz, CDCl3) δ: 174.99,
164.14 (t, J = 35.0 Hz), 148.19, 138.29, 137.51, 133.60 (t, J = 3.5 Hz), 126.79 (t, J = 9.0
Hz), 124.63, 122.27, 121.62 (t, J = 24.5 Hz), 114.53, 114.02 (t, J = 251.1 Hz), 63.25,
46.79, 29.61, 25.67, 25.62, 13.73. HRMS (ESI) ([M+H]+) Calcd. For C20H23F2N2O3:
377.1671, Found: 377.1668.
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Ethyl 2-(8-acetamido-2-methylquinolin-5-yl)-2,2-difluoroacetate (3ah). White solid
(62.0 mg, 77% yield), m.p. 151–152 °C. 1H NMR (400 MHz, CDCl3) δ: 9.98 (s, 1H),
8.74 (d, J = 8.2 Hz, 1H), 8.51 (d, J = 8.8 Hz, 1H), 7.76 (d, J = 8.3 Hz, 1H), 7.38 (d, J =
8.8 Hz, 1H), 4.27 (q, J = 7.1 Hz, 2H), 2.73 (s, 3H), 2.36 (s, 3H), 1.24 (t, J = 7.1 Hz, 3H);
13C NMR (100 MHz, CDCl3) δ: 168.85, 164.22 (t, J = 35.1 Hz), 157.48, 137.52, 136.71,
133.58 (t, J = 3.6 Hz), 125.61 (t, J = 9.0 Hz), 123.18, 122.73, 121.74 (t, J = 24.3 Hz),
114.51, 114.12 (t, J = 250.9 Hz), 63.23, 25.07, 24.96, 13.75. HRMS (ESI) ([M+H]+)
Calcd. For C16H17F2N2O3: 323.1202, Found: 323.1201.
Ethyl 2-(8-benzamido-2-methylquinolin-5-yl)-2,2-difluoroacetate (3ai). Yellow solid
(77.8 mg, 81% yield), m.p. 112–113 °C. 1H NMR (400 MHz, CDCl3) δ: 10.96 (s, 1H),
8.92 (d, J = 8.2 Hz, 1H), 8.55 (d, J = 8.8 Hz, 1H), 8.07-8.05 (m, 2H), 7.84 (d, J = 8.3 Hz,
1H), 7.597.53 (m, 3H), 7.41 (d, J = 8.8 Hz, 1H), 4.28 (q, J = 7.1 Hz, 2H), 2.77 (s, 3H),
1.25 (t, J = 7.0 Hz, 3H); 13
C NMR (100 MHz, CDCl3) δ: 165.38, 164.24 (t, J = 35.0 Hz),
157.54, 138.08, 136.79, 134.85, 133.72 (t, J = 3.5 Hz), 132.01, 128.83, 127.23, 125.72
(t, J = 8.9 Hz), 123.26, 122.82, 121.98 (t, J = 24.4 Hz), 114.70, 114.13 (t, J = 251.0 Hz),
63.27, 25.16, 13.78. HRMS (ESI) ([M+H]+) Calcd. For C21H19F2N2O3: 385.1358, Found:
385.1356.
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Ethyl 2-(8-acetamido-4-methylquinolin-5-yl)-2,2-difluoroacetate (3aj). Yellow solid
(41.9 mg, 52% yield), m.p. 130–131 °C. 1H NMR (400 MHz, CDCl3) δ: 10.20 (s, 1H),
8.74 (d, J = 8.4 Hz, 1H), 8.63 (d, J = 4.3 Hz, 1H), 7.86 (d, J = 8.4 Hz, 1H), 7.34 (d, J =
4.2 Hz, 1H), 4.40 (q, J = 7.1 Hz, 2H), 2.73 (s, 3H), 2.35 (s, 3H), 1.34 (t, J = 7.1 Hz, 3H);
13C NMR (100 MHz, CDCl3) δ: 168.94, 164.55 (t, J = 35.2 Hz), 147.53, 147.05, 144.50,
139.27, 138.04, 128.96 (t, J = 12.0 Hz), 126.19, 121.34 (t, J = 23.7 Hz), 114.98 (t, J =
248.8 Hz), 113.81, 63.39, 25.17, 23.88 (t, J = 9.3 Hz), 13.77. HRMS (ESI) ([M+H]+)
Calcd. For C16H17F2N2O3: 323.1202, Found: 323.1203.
Ethyl 2-(8-benzamido-4-methylquinolin-5-yl)-2,2-difluoroacetate (3ak). Yellow
solid (57.6 mg, 60% yield), m.p. 118–119 °C. 1H NMR (400 MHz, CDCl3) δ: 10.14 (s,
1H), 8.91 (d, J = 8.4 Hz, 1H), 8.65 (d, J = 4.2 Hz, 1H), 8.05 (d, J = 7.1 Hz, 2H), 7.92 (d,
J = 8.4 Hz, 1H), 7.567.50 (m, 3H), 7.34 (d, J = 4.1 Hz, 1H), 4.40 (q, J = 7.2 Hz, 2H),
2.73 (s, 3H), 1.34 (t, J = 7.1 Hz, 3H); 13
C NMR (100 MHz, CDCl3) δ: 165.42, 164.50 (t,
J = 34.9 Hz), 147.19, 144.51, 139.73, 138.07, 134.76, 131.95, 128.91 (t, J = 12.0 Hz),
128.72, 127.23, 126.25, 126.11, 121.54 (t, J = 23.8 Hz), 114.95 (t, J = 248.9 Hz), 113.92,
63.37, 23.83 (t, J = 9.1 Hz), 13.74. HRMS (ESI) ([M+H]+) Calcd. For C21H19F2N2O3:
385.1358, Found: 385.1360.
Ethyl 2-(8-acetamido-4-chloroquinolin-5-yl)-2,2-difluoroacetate (3al). Yellow solid
(59.9 mg, 70% yield), m.p. 134–135 °C. 1H NMR (400 MHz, CDCl3) δ: 10.02 (s, 1H),
8.85 (d, J = 8.5 Hz, 1H), 8.64 (d, J = 4.6 Hz, 1H), 8.13 (d, J = 8.6 Hz, 1H), 7.60 (d, J =
4.6 Hz, 1H), 4.35 (q, J = 7.2 Hz, 2H), 2.36 (s, 3H), 1.31 (t, J = 7.1 Hz, 3H); 13
C NMR
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(100 MHz, CDCl3) δ: 168.93, 164.18 (t, J = 34.2 Hz), 146.89, 140.31, 140.24, 137.72,
129.39 (t, J = 13.6 Hz), 124.96, 124.11, 121.00 (t, J = 23.2 Hz), 115.20, 113.60 (t, J =
248.8 Hz), 63.14, 25.14, 13.73. HRMS (ESI) ([M+H]+) Calcd. For C15H14F2N2O3:
343.0656, Found: 343.0654.
Ethyl 2-(8-benzamido-4-chloroquinolin-5-yl)-2,2-difluoroacetate (3am). Yellow
solid (63.6 mg, 63% yield), m.p. 128–129 °C. 1H NMR (400 MHz, CDCl3) δ: 10.97 (s,
1H), 9.03 (d, J = 8.5 Hz, 1H), 8.72 (d, J = 4.6 Hz, 1H), 8.20 (d, J = 8.6 Hz, 1H), 8.06 (d,
J = 7.00 Hz, 2H), 7.63 (d, J = 4.7 Hz, 1H), 7.607.53 (m, 3H), 4.37 (q, J = 7.1 Hz, 2H),
1.32 (t, J = 7.2 Hz, 3H); 13
C NMR (100 MHz, CDCl3) δ: 165.57, 164.21 (t, J = 34.0 Hz),
147.11, 140.82, 140.48, 137.85, 134.63, 132.22, 129.49 (t, J = 13.6 Hz), 128.88, 127.33,
125.08, 124.28, 121.28 (t, J = 23.4 Hz), 115.43, 113.64 (t, J = 249.0 Hz), 63.18, 13.78.
HRMS (ESI) ([M+H]+) Calcd. For C20H16ClF2N2O3:405.0812, Found: 405.0808.
Ethyl 2-(8-acetamido-6-methoxyquinolin-5-yl)-2,2-difluoroacetate (3an). Gray solid
(43.1 mg, 51% yield), m.p. 178–179 °C. 1H NMR (400 MHz, CDCl3) δ: 10.02 (s, 1H),
8.72 (d, J = 8.8 Hz, 1H), 8.65-8.63 (m, 2H), 7.45 (dd, J1 = 4.1 Hz, J2 = 8.8 Hz, 1H),
4.38 (q, J = 7.1 Hz, 2H), 3.92 (s, 3H), 2.35 (s, 3H), 1.35 (t, J = 7.2 Hz, 3H); 13
C NMR
(100 MHz, CDCl3) δ: 169.23, 164.09 (t, J = 32.5 Hz), 156.64 (t, J = 6.5 Hz), 145.93,
138.84, 134.07, 133.15 (t, J = 8.0 Hz), 126.62, 122.88, 114.42 (t, J = 245.5 Hz), 107.23
(t, J = 24.6 Hz), 103.30, 62.65, 56.95, 25.07, 13.92. HRMS (ESI) ([M+H]+) Calcd. For
C16H17F2N2O4: 339.1151, Found: 339.1146.
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Ethyl 2-(8-benzamido-6-methoxyquinolin-5-yl)-2,2-difluoroacetate (3ao). Yellow
solid (52.0 mg, 52% yield), m.p. 145–146 °C. 1H NMR (400 MHz, CDCl3) δ: 10.98 (s,
1H), 8.84 (s, 1H), 8.76 (d, J = 8.8 Hz, 1H), 8.70 (d, J = 3.7 Hz, 1H), 8.05 (d, J = 7.1 Hz,
2H), 7.587.52 (m, 3H), 7.48 (dd, J1 = 4.1 Hz, J2 = 8.8 Hz, 1H), 4.40 (q, J = 7.2 Hz,
2H), 3.98 (s, 3H), 1.37 (t, J = 7.1 Hz, 3H); 13
C NMR (100 MHz, CDCl3) δ: 165.61,
164.09 (t, J = 32.6 Hz), 156.68 (t, J = 6.3 Hz), 146.11, 138.90, 134.58, 134.28, 133.20 (t,
J = 8.0 Hz), 132,21, 128.81, 127.17, 126.69, 122.97, 114.46 (t, J = 245.3 Hz), 107.46 (t,
J = 24.5 Hz), 103.43, 62.66, 56.95, 13.93. HRMS (ESI) ([M+H]+) Calcd. For
C21H19F2N2O4: 401.1307, Found: 401.1303.
Ethyl 2,2-difluoro-2-(7-methyl-8-pivalamidoquinolin-5-yl)acetate (3ap). Yellow
solid (33.7 mg, 37% yield), m.p. 84–86 °C. 1H NMR (400 MHz, CDCl3) δ: 9.22 (s, 1H),
8.84-8.82 (m, 1H), 8.59-8.57 (m, 1H), 7.77 (s, 1H), 7.43 (dd, J1 = 4.2 Hz, J2 = 8.7 Hz,
1H), 4.26 (q, J = 7.2 Hz, 2H), 2.46 (s, 3H), 1.45 (s, 9H), 1.25 (t, J = 7.1 Hz, 3H); 13
C
NMR (100 MHz, CDCl3) δ: 177.16, 164.09 (t, J = 35.0 Hz), 149.13, 142.45, 135.06,
133.12 (t, J = 3.5 Hz), 131.44, 129.47 (t, J = 8.8 Hz), 124.27 (t, J =23.9 Hz), 123.03 (t, J
= 1.9 Hz), 121.28, 113.89 (t, J = 251.4 Hz), 63.35, 40.05, 27.72, 20.38, 13.76. HRMS
(ESI) ([M+H]+) Calcd. For C16H17F2N2O3: 365.1671, Found: 365.1668.
Ethyl 2-(8-benzamido-7-methylquinolin-5-yl)-2,2-difluoroacetate (3aq). White solid
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(39.4 mg, 41% yield), m.p. 141–142 °C. 1H NMR (400 MHz, CDCl3) δ: 9.75 (s, 1H),
8.80 (d, J = 3.2 Hz, 1H), 8.61 (d, J = 8.1 Hz, 1H), 8.08 (d, J = 7.2 Hz, 2H), 7.84 (s, 1H),
7.617.57 (m, 1H), 7.547.51 (m, 2H), 7.44 (dd, J1 = 4.2 Hz, J2 = 8.7 Hz, 1H), 4.28 (q,
J = 7.2 Hz, 2H), 2.57 (s, 3H), 1.27 (t, J = 7.1 Hz, 3H); 13
C NMR (100 MHz, CDCl3) δ:
165.68, 164.08 (t, J = 34.8 Hz), 149.12, 142.30, 135.03, 134.46, 133.29 (t, J = 3.5 Hz),
132,11, 131.43, 129.67 (t, J = 8.9 Hz), 128.74, 127.88, 124.57 (t, J = 24.1 Hz),123.12,
121.47,113.87 (t, J = 251.3 Hz), 63.44, 20.77, 13.80. HRMS (ESI) ([M+H]+) Calcd.
For C21H19F2N2O4: 385.1358, Found: 385.1353.
Methyl 2-(8-benzamidoquinolin-5-yl)-2,2-difluoroacetate (4a). White solid (35.6
mg, 40% yield), m.p. 151–152 °C. 1H NMR (400 MHz, CDCl3) δ: 10.92 (s, 1H), 8.98 (d,
J = 8.2 Hz, 1H), 8.90 (d, J = 3.2 Hz, 1H), 8.68 (d, J = 8.5 Hz, 1H), 8.08 (d, J = 6.9 Hz,
2H), 7.93 (d, J = 8.3 Hz, 1H), 7.617.55 (m, 4H), 3.84 (s, 3H); 13
C NMR (100 MHz,
CDCl3) δ: 165.61, 164.73 (t, J = 35.4 Hz), 148.48, 138.68, 137.60, 134.76, 133.74 (t, J
= 3.8 Hz), 132.16, 128.89, 127.36, 126.94 (t, J = 9.0 Hz), 124.80 (t, J = 2.1 Hz), 122.59,
121.98 (t, J = 24.4 Hz), 114.79, 114.08 (t, J = 251.0 Hz), 53.75. HRMS (ESI) ([M+H]+)
Calcd. For C19H15F2N2O3: 357.1045, Found: 357.1043.
Methyl 2-(8-acetamidoquinolin-5-yl)-2,2-difluoroacetate (4b). White solid (31.6 mg,
43% yield), m.p. 156–157 °C. 1H NMR (400 MHz, CDCl3) δ: 9.95 (s, 1H), 8.82 (d, J =
3.7 Hz, 1H), 8.78 (d, J = 8.3 Hz, 1H), 8.63 (d, J = 8.6 Hz, 1H), 7.85 (d, J = 8.3 Hz, 1H),
7.53 (dd, J1 = 4.1 Hz, J2 = 8.7 Hz, 1H), 3.83 (s, 3H), 2.37 (s, 3H); 13
C NMR (100 MHz,
CDCl3) δ: 168.95, 164.65 (t, J = 35.4 Hz), 148.23, 138.00, 137.41, 133.55, (t, J = 3.6
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Hz), 126.78 (t, J = 9.0 Hz), 124.60, 122.44, 121.64 (t, J = 24.3 Hz), 114.51, 114.00 (t, J
= 251.1 Hz), 53.71, 25.09. HRMS (ESI) ([M+H]+) Calcd. For C14H13F2N2O3: 295.0889,
Found: 295.0886.
N-(5-(1,1-difluoro-2-morpholino-2-oxoethyl)quinolin-8-yl)benzamide (4c). White
solid (74.0 mg, 72% yield), m.p. 160–161 °C. 1H NMR (400 MHz, CDCl3) δ: 10.93 (s,
1H), 8.96 (d, J = 8.2 Hz, 1H), 8.90 (d, J = 3.1 Hz, 1H), 8.66 (d, J = 8.2 Hz, 1H),
8.098.07 (m, 2H), 7.83 (d, J = 8.2 Hz, 1H), 7.627.54 (m, 4H), 3.71 (m, 4H),
3.593.53 (m, 4H); 13
C NMR (100 MHz, CDCl3) δ: 165.56, 162.00 (t, J = 30.3 Hz),
148.59, 138.63, 137.43, 134.56, 133.98, 132.13, 128.81, 127.26, 126.15 (t, J = 8.2 Hz),
125.04, 122.84 (t, J = 24.0 Hz), 122.57, 116.26 (t, J = 250.1 Hz), 114.26, 66.62, 66.36,
46.86, 43.62. HRMS (ESI) ([M+H]+) Calcd. For C22H20F2N3O3: 412.1467, Found:
412.1464.
N-(5-(1,1-Difluoro-2-morpholino-2-oxoethyl)quinolin-8-yl)acetamide (4d). White
solid (57.6 mg, 66% yield), m.p. 149–154 °C. 1H NMR (400 MHz, CDCl3) δ: 9.98 (s,
1H), 8.84 (d, J = 3.0 Hz, 1H), 8.78 (d, J = 8.2 Hz, 1H), 8.63 (d, J = 7.8 Hz, 1H), 7.77 (d,
J = 8.3 Hz, 1H), 7.54 (dd, J1 = 4.2 Hz, J2 = 8.7 Hz, 1H), 3.71 (br, 4H), 3.573.52 (m,
4H), 2.37 (s, 3H); 13
C NMR (100 MHz, CDCl3) δ: 168.99, 162.04 (t, J = 30.2 Hz),
148.42, 138.15, 137.39, 133.95, 126.14 (t, J = 8.3 Hz), 125.00, 122.67 (t, J = 24.0 Hz),
122.47, 116.29 (t, J = 250.1 Hz), 114.14, 66.64, 66.38, 46.88, 43.66, 25.08. HRMS (ESI)
([M+H]+) Calcd. For C17H18F2N3O3: 350.1311, Found: 350.1306.
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N-(5-(Perfluorohexyl)quinolin-8-yl)benzamide (4e). Yellow solid (80.6 mg, 57%
yield), m.p. 127–130 °C. 1H NMR (400 MHz, CDCl3) δ: 10.98 (s, 1H), 9.01 (d, J = 8.4
Hz, 1H), 8.89 (d, J = 3.3 Hz, 1H), 8.55 (d, J = 8.6 Hz, 1H), 8.08 (d, J = 7.0 Hz, 2H),
7.92 (d, J = 8.4 Hz, 1H), 7.627.54 (m, 4H); 13
C NMR (100 MHz, CDCl3) δ: 165.65,
148.48, 138.63, 138.46, 134.62, 133.82, 133.79, 132.25, 129.90 (t, J = 9.5 Hz), 128.90,
127.38, 125.70, 122.79, 117.84 (t, J = 22.9 Hz), 114.52. HRMS (ESI) ([M+H]+) Calcd.
For C22H12F13N2O: 567.0737, Found: 567.0739.
N-(5-(Perfluorohexyl)quinolin-8-yl)acetamide (4f). White solid (69.4 mg, 55% yield),
m.p. 90–91 °C. 1H NMR (400 MHz, CDCl3) δ: 10.06 (s, 1H), 8.868.84 (m, 2H), 8.53
(d, J = 6.9 Hz, 1H), 7.86 (d, J = 6.7 Hz, 1H), 7.57 (dd, J1 = 3.3 Hz, J2 = 7.0 Hz, 1H),
2.39 (s, 3H); 13
C NMR (100 MHz, CDCl3) δ: 169.13, 148.30, 138.47, 137.89, 133.74,
129.82 (t, J = 7.6 Hz), 125.60, 122.70, 117.64 (t, J = 18.4 Hz), 114.35, 25.13. HRMS
(ESI) ([M+H]+) Calcd. For C17H10F13N2O: 505.0580, Found: 505.0576.
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5. 1H and
13C NMR spectra of the products
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