total synthesis of lysergic acidgbdong.cm.utexas.edu/seminar/old/Total synthesis of... · ·...
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Total Synthesis of Lysergic Acid
Penghao Chen
Dong Group Seminar
N 14th 2012Nov 14th 2012
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Core Structure of Ergot AlkaloidsCo e St uctu e o got a o ds
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Epimerisation of lysergic/isolysergic acidp e sat o o yse g c/ so yse g c ac d
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E. C. Kornfeld & R. B. WoodwardC o e d & ood a d
J. Am. Chem. Soc. 1956, 78, 3087–3114.
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Direct Introduction of Nitrogen at C4ect t oduct o o t oge at C
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Addition of a Carbon Chain at C5
O O
O OR
Cl
OO
Br
dd t o o a Ca bo C a at C5
N
O
Br
O
OR
ZnN
hydrolysisCl
Cl
O
toluene
N3
DCM
HBr(aq)
NBBz BzBz
OO
OOH
O
ONMe
HO
OH
NaBH4
NB
N
NH2
100oCN
Bz Bz Bz
Yield is too low, abandoned
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Addition of a Carbon Chain at C5dd t o o a Ca bo C a at C5
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Unsaturated AldehydeU satu ated de yde
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Unsaturated AldehydeU satu ated de yde
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Unsaturated AldehydeU satu ated de yde
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Unsaturated AldehydeU satu ated de yde
NHOOC
H
NH
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R. Ramageg
NHOOC
H
epimerisation
NHOOC
H
NH NHNH
NH
HOOC
NH
Tetrahedron Letter No. 47, pp 4311‐4314, 1976
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R. Ramage
OCOOCH3
Ph P
H3COOCCOOH
g
N
O Ph3PCOOtBu
benzene/tBuOHreflux 4d
90% TFA
25oC, 2h
Bzreflux, 4d
NBz
H3COOCNH2
13
Curtius Degradation
NH2
methylationcyclization products
NBz
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J. Rebek, Jr.,
T t h d L tt V l 24 N 9 859 860 1983Tetrahedron Letters, Vol. 24, No. 9, pp 859‐860, 1983J. Am . Chem. Soc. 1984, 106, 1813‐1819
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J. Rebek, Jr.,
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James B. Hendrickson
Org. Lett., Vol. 6, No. 1, 2004
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Bondset b‐>a
X COOMe N
MeOOCN
MeOOC
O
NH
N
COCl
+OXEMgBr
ZnCl2
NH
O
COClNH
NH
N
MeOOCN
MeOOC
O
N
X -HX
O
N NH
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Bondset a‐>b
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Yanxing Jiag
(R)‐5
Org. Lett., Vol. 13, No. 18, 2011
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Yanxing Jiag
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Hiroaki Ohno & Nobutaka Fujiij
NHTs
NHOH
TsH
OH
NHTs
NTs N
HBr
NTs NTs
Org. Lett., Vol. 10, No. 22, 2008J Org Chem 2011 76 5506 5512J. Org. Chem. 2011, 76, 5506‐5512J. Org. Chem. 2011, 76, 2072‐2083
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Hiroaki Ohno & Nobutaka Fujii
Ph Ph
j
NTs
Pd(PPh3)4, InI TsHN OHaldehyde
PhCH(OMe)2CSA
DCE
O NTsNIS, AgNO3
THF
O NTs
IBr Pd(PPh3)4, Et3B
allyl alcohol
Br TsCl, NaOHn-Bu4NHSO4
Br
NH
allyl alcohol
NH
NTs
TsN Ph18
1) OsO4, NMOTHF/H2O
BrO
O
NTsPhI
BrO
2) NaIO4THF/H2O
NTs
NHK reactionNTs
OH
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Hiroaki Ohno & Nobutaka Fujii
BrO
TsN Ph
O
TsN Ph
j
NTs
Br
OH
Dess-Martinperiodinane
DCMN
Br
OTs N
Ts
BrO
TsN Ph
NsNHNH2DEAD Ph3P
BrH
NHTsPTSA
(R)-alpine-Borane
THFNTs
OH
THFNTs
HOHMeOH/DCM
H
1a
(S) l i B
BrO
TsN Ph
NsNHNH2DEAD Ph3P
Br
H
OH
NHTs
PTSA
H
(S)-alpine-Borane
THFNTs
OH
THFNTs
MeOH/DCM1b
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Hiroaki Ohno & Nobutaka Fujiij
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Hiroaki Ohno & Nobutaka Fujii
1) Dess-Martin periodinane, DCM2) NaClO2 NaH2PO4 2-methylbut-2-ene
j
NH
HOTs
2) NaClO2, NaH2PO4, 2 methylbut 2 enet-BuOH/THF/H2O
3) TMSCHN2, MeOH/toluene4) seperation
NH
MeOOC Ts
NTs NTs
1) sodium naphthalenide2) formalin, NaBH3CN
AcOH, MeOH
NH
MeOOCN
H
HOOC
hydrolysis,
NH NH
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Hiroaki Ohno & Nobutaka Fujiij
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Hiroaki Ohno & Nobutaka Fujii
ORPd-catalyzeddomino cyclization
Myers alleneformation
j
NH
Ts
Br
H
H
NHTs
OR
NTs NTs
H
BrH
OH
regioselectivereduction
O
NTs
BrOR
NHTNTs
BrOR
O
NHTs TsNHTs
BrOR
BrOH
Sonogashiracoupling
Br
NTs
NHTsNTs
NHTs
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Tohru Fukuyamay
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Tohru Fukuyamay
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Tohru Fukuyamay
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Tohru Fukuyamay
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Tohru Fukuyamay
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Albert Padwa’s Isomunchnone
N
OO
R1
N
OO
R1
N
R3
R2N
R3
R2
munchnone
OR1HOR1
NR3
R2
O NR3
R2
O
isomunchnone
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Albert Padwa’s Isomunchnone
O
NN2
ORh++
N
O
OO O O O
O COM
N
O COMeO
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Albert Padwa’s Isomunchnone
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Albert Padwa’s Isomunchnone
O H
I
O
NHMe1) H
TMS
PdCl (Ph P)
O
NHMe
H
1) Cl
O O
OEt HO
PdCl2(Ph3P)2CuI, Ph3P, Et3N
2) K2CO3, MeOH
2) MsN3, Et3NNO
N2
CO2Et
OONHMe
ONHMe O
Rh++NO
OO
EtO
HEt3SiH
BF3 Et2O
O H
O
EtO2C OO
EtO2C OEtO
+ +
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SummarySummary
1. Chirality of C2 is obtained by epimerisation
2. Chirality of C1 is obtained by resolution,2. Chirality of C1 is obtained by resolution, chiral starting substances or asymmetric cyclizationcyclization
3. Old methods always use indoline while recent methods can tolerate indole ring during total synthesisindole ring during total synthesis process
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AcknowledgementAcknowledgement
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COOHCOOH
alcoholic hydrogen
COOH
N
chlorideplatinic oxideconc. HCl
NHN
HH
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