Enantioselective Allyltitanations and Metathesis Reactions. Application to the Synthesis of Piperidine Alkaloids (+)-Sedamine and (−)-Prosophylline
作者:Janine Cossy、Catherine Willis、Véronique Bellosta、Samir BouzBouz
DOI:10.1021/jo010653d
日期:2002.4.1
An enantioselective synthesis of the piperidine alkaloids (+)-sedamine and (-)-prosophylline is reported. The synthesis of (+)-sedamine has been achieved in 12 steps with an overall yield of 20% from benzaldehyde, and (-)-prosophylline was obtained in 15 steps with an overall yield of 9.2%, starting from D-glyceraldehyde acetonide 14. The key steps are enantioselective allyltitanation reactions and
报道了哌啶生物碱(+)-sedamine和(-)-prosophyllineline的对映选择性合成。从D-甘油醛丙酮化物开始,分12步合成了(+)-sedamine,总产率为20%(苯);以15步获得(-)-prosophylline的总产率为9.2%。关键步骤是对映选择性烯丙基化反应以及闭环或交叉复分解反应。