The First Stereoselective Total Synthesis of Quinine · The First Stereoselective Total Synthesis...
Transcript of The First Stereoselective Total Synthesis of Quinine · The First Stereoselective Total Synthesis...
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The First Stereoselective TotalSynthesis of Quinine
Gilbert Stork, Deqiang Niu, A. Fujimoto, EmilR. Koft, James M. Balkovec, James R. Tata
and Gregory R. Dake
J. Am. Chem. Soc. 2001, 123, 3239 - 3242
N
OMeN
HOH
Presented by Jennifer Eddy
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Gilbert Stork
• Born in Brussels, Belgium on Dec. 31, 1921• 1939: Moved to U.S.• 1945: Ph.D. Univ. of Wisconsin
Advisor: S.M. McElvain• 1945-1946: Senior Research Chemist, Lakeside Laboratories• 1946- 1948: Instructor, Harvard University• 1948- 1953: Associate Professor, Harvard University• 1953-1955: Associate Professor, Columbia University• 1955- 1993: Professor, Columbia University• 1993- Present: Professor Emeritus, Columbia University
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Previous work
• 1907: The correct connectivity is “unraveled” by Rabe• 1918: Rabe and Kindler synthesize quinine from
quinotoxine• 1944: Woodward and Doering synthesize quinotoxine• 1978: Uskoković, Gutzwiller and collaborators at
Hoffmann- La Roche synthesize quinine using astereoselective approach However, only 3 of the 4 stereocenters
N
OMeN
HOH
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Retrosynthesis
N
OMeN
N
OMeN
HOH
N
MeO
NH
X
classic “Rabe”disconnection
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Retrosynthesis
N
OMeN
N
OMeNH
ORN
OMe
NH
HOR
N
OMeN
HOH
N
OMe
NOR
N
OMeN
OR
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Retrosynthesis
N
OMeN3
OR
O
N
OMeN3
OR
HO
N
OMe
Me + N3
RO
O
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Formal Total Synthesis
OO1. Et2NH/AlMe3
2. TBS-Cl/Imidazole/DMF Et2N OTBSO
LDAICH2CH2OTBDPS
O
TBDPSO
O
DIBAL-H
Ph3P CHOMeEt2NOTBS
O
TBDPSO
(PPTS)
SO3 NH
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Mechanism of Wittig
O
TBDPSO
O
DIBAl-H
O
TBDPSO
HO O
TBDPSO
OH
Ph3P CHOMe
TBDPSO
OHPh3P C
H
OMe
O
TBDPSO
OHOPh3P OMe
TBDPSO
OHMeO
PPh3O
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Formal Total Synthesis
TBDPSO
OHMeO
Ph3P/DEAD(PhO)2P(O)N3
TBDPSO
N3MeO
HCl
THF/CH2Cl2
TBDPSO
N3OHC
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Formal Total Synthesis
N
OMe
MeLDATHF
TBDPSO
N3OHC
NaHCO3
N
MeOOH N3
OTBDPS
DMSO, (ClCO)2
NEt3
N
MeON3
OTBDPS
OPh3P
THF
N
MeO
OTBDPS
N
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Staudinger/Aza-WittigMechanism
N
MeON
OTBDPS
O N NPPh3
N
MeON
OTBDPS
O N N PPh3
N
MeON
OTBDPS
O NPh3P N
N
MeON
OTBDPS
O PPh3
N
MeON
OTBDPS
O PPh3
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Staudinger/Aza-WittigMechanism
N
MeO
OTBDPS
NPPh3
O
N
MeO
OTBDPS
NO PPh3
PPh3O
N
MeO
OTBDPS
N
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Formal Total Synthesis
N
OMe
MeLDATHF
TBDPSO
N3OHC
NaHCO3
N
MeOOH N3
OTBDPS
DMSO, (ClCO)2
NEt3
N
MeON3
OTBDPS
OPh3P
THF
N
MeO
OTBDPS
N
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Formal Total Synthesis
N
MeO
OTBDPS
NNaBH4
MeOH/THF
N
MeO
OTBDPS
NHH
NOTBDPSAr
HH3B
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Formal Total Synthesis
N
MeO
OTBDPS
NHH HF/CH3CN
N
MeO
OH
NHH
MsCl/Py
CH2Cl2
N
MeO
OMs
NHH
N
OMeN
1. NaH/DMSO
2. O2 N
OMeN
HOH
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Formal Total Synthesis
N
OMeN
1. NaH/DMSO
2. O2
N
OMeN
HOH
Gutzwiller, J.; Uskoković, M.R. J. Am. Chem. Soc. 1978, 100, 576
NH
HAr
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Stork’s synthesis of quinine
• Unique retrosynthetic analysis provided firststereoselective synthesis of quinine
• Completed in 19 steps• The majority of steps were high yielding (70-
95%)
OO+
N
OMeN
HOH
N
OMe
Me