Enantioselective Total Syntheses of Manzamine A and Related Alkaloids John M. Humphrey, Yusheng...
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Enantioselective Total Syntheses of Manzamine A and Related Alkaloids
John M. Humphrey, Yusheng Liao, Amjad Ali, Tobias Rein, Yue-Ling Wong,
Hui-Ju Chen, Anne K. Courtney, and Stephen F. Martin*
Presented by: Jixin Liu
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Stephen F. Martin
M. June and J. Virgil Waggoner Regents Chair in Chemistrynow at The University of Texas at Austin
B.S. University of New Mexico (1968)Ph.D. Princeton University (1972) with Professor Edward C. TaylorPostdoctoral work at the University of Munich with Professor Rudolf
Gompper, and further work with Professor George Büchi at the MIT.
Known for his work in alkaloid synthesis;Current research is directed toward the syntheses of natural and
unnatural products that are of biological or structural interest
J. AM. CHEM. SOC. 2002, 124, 8584 8592
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Manzamine A, a structurally unique β-carboline alkaloid derived from marine sponge Haliclona sp., exhibiting a high level of antimalarial activity in vivo when tested in
Plasmodium berghei (ANKA)-infected mice.
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Manzamine A
N
H
N
H
H
OH
NNH
1
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3D
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Manzamine A
N
H
N
H
H
OH
NNH
A B
D C
E
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Retro synthesis
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Key Steps
• Intramolecular Diels Alder reactions to produce the tricyclic ABC core of the manzamines
• Ring-Closing Metathesis of E ring
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Key steps
D-A reaction
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Key steps Ring-Closing
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Ring Closing
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Ring-Closing
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Forward Synthesis
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Forward Synthesis
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Forward Synthesis
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Forward Synthesis
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N
H
HN O
CH(OMe)2
O
OO
N
H
HN O
CH(OMe)2
O
OO
CH2CH2CH CH2LiN
H
HN O
CH(OMe)2
O
OO
N
H
H
N O
CH(OMe)2
O
O
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Forward Synthesis
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Forward Synthesis
NH
N
H
H
OH
N NH
1
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H2N
HNN
CHO
H
N
H
H
OH
5
NH
NH
OH
HN
NH
H2O
CF3CO2H
NH
NH
OH
NH
NHN
H
N
H
H
OH
HN NHH
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NH
N
H
H
OH
HN NHH
NH
N
H
H
OH
HN NH
NC
NC
Cl
Cl
O
O
NC
NC
Cl
Cl
OH
OH
-
NH
N
H
H
OH
N NH
1
Pictet-Spengler
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Conclusion
• The longest linear sequence was 21 steps• The concise approach highlights a novel
strategy for assembling the tricyclic ABC ring core by a Diels Alder reaction.
• 13- and 8-membered heterocyclic rings were synthesized via RCM.