New Asymmetric Synthesis of Enantiomeric Pairs of the 2-Substituted Pyrrolidines Bgugaine and Irniine
摘要:
A new asymmetric route to 2-substituted pyrrolidines starting with the Sharpless asymmetric dihydroxylation (AD) of 4-pentenylphthalimide (5) followed by aminocyclization of the resultant amino alcohol is presented. The application to the asymmetric synthesis has been examined for two 2-substituted pyrrolidine alkaloids, bgugaine (1) and irniine (2).
New Asymmetric Synthesis of Enantiomeric Pairs of the 2-Substituted Pyrrolidines Bgugaine and Irniine
摘要:
A new asymmetric route to 2-substituted pyrrolidines starting with the Sharpless asymmetric dihydroxylation (AD) of 4-pentenylphthalimide (5) followed by aminocyclization of the resultant amino alcohol is presented. The application to the asymmetric synthesis has been examined for two 2-substituted pyrrolidine alkaloids, bgugaine (1) and irniine (2).
New synthesis of all the four stereoisomers of indolizidine 209D and their affinity for nicotinic acetylcholine receptor
作者:Hiroki Takahata、Minoru Kubota、Kozue Ihara、Naoki Okamoto、Takefumi Momose、Nehad Azer、Amira T. Eldefrawi、Mohyee E. Eldefrawi
DOI:10.1016/s0957-4166(98)00338-3
日期:1998.9
Both enantiomers of a 2-(4-pentenyl)pyrrolidine derivative 4 (65-90% ee), prepared via the asymmetric dihydroxylation (AD) of terminal olefin 2, underwent a second AD to provide all of the four stereoisomers of indolizidine 209D 1 with enantiomeric enhancement (92-98% ee). The affinity of 1 for nicotinic acetylcholine receptor was evaluated. (C) 1998 Elsevier Science Ltd. All rights reserved.
New Asymmetric Synthesis of Enantiomeric Pairs of the 2-Substituted Pyrrolidines Bgugaine and Irniine
A new asymmetric route to 2-substituted pyrrolidines starting with the Sharpless asymmetric dihydroxylation (AD) of 4-pentenylphthalimide (5) followed by aminocyclization of the resultant amino alcohol is presented. The application to the asymmetric synthesis has been examined for two 2-substituted pyrrolidine alkaloids, bgugaine (1) and irniine (2).