Asymmetric synthesis of 3,5-disubstituted indolizidines by intermolecular addition of an allylsilane on an N-acyliminium ion
摘要:
A diastereoselective synthesis of 3,5-disubstituted indolizidines based on an intermolecular addition of an allylsilane on an acyliminium ion derived from (S)-pyroglutamic acid is described. The synthetic potential of this methodology is demonstrated by the enantioselective synthesis of (-)-indolizidine 195B, (-)-indolizidine 223AB, (+)-monomorine and (-)-3-butyl-5-propyl indolizidine. (c) 2006 Elsevier Ltd. All rights reserved.
Asymmetric synthesis of 3,5-disubstituted indolizidines by intermolecular addition of an allylsilane on an N-acyliminium ion
摘要:
A diastereoselective synthesis of 3,5-disubstituted indolizidines based on an intermolecular addition of an allylsilane on an acyliminium ion derived from (S)-pyroglutamic acid is described. The synthetic potential of this methodology is demonstrated by the enantioselective synthesis of (-)-indolizidine 195B, (-)-indolizidine 223AB, (+)-monomorine and (-)-3-butyl-5-propyl indolizidine. (c) 2006 Elsevier Ltd. All rights reserved.
Enantioselective Syntheses of (−)- and (+)-Monomorine I
作者:Naoki Toyooka、Dejun Zhou、Hideo Nemoto
DOI:10.1021/jo800593n
日期:2008.6.1
A concise enantioselective total synthesis of unnatural (-)-monomorine I has been achieved starting from lactam 2 in 54% overall yield. Natural (+)-monomorine I was also synthesized.