Efficient Enantiomeric Synthesis of Pyrrolidine and Piperidine Alkaloids from Tobacco
作者:Felpin、Sandrine Girard、Giang Vo-Thanh、Richard J. Robins、Jean Villiéras、Jacques Lebreton
DOI:10.1021/jo010386b
日期:2001.9.1
An enantiomeric synthesis of six piperidine and pyrrolidine alkaloids, (S)-nornicotine 1, (S)-nicotine 2, (S)-anatabine 3, (S)-N-methylanatabine 4, (S)-anabasine 5, and (S)-N-methylanabasine 6, known as natural products in tobacco, was established from a common chiral homoallylic (S)-3-(1-azido-but-3-enyl)-pyridine 15. An intramolecular hydroboration-cycloalkylation of the homoallylic azide intermediate
对映体的六个哌啶和吡咯烷生物碱,(S)-去甲烟碱1,(S)-烟碱2,(S)-安那他滨3,(S)-N-甲基安那他滨4,(S)-天麻碱5和(S )-N-甲基天麻碱6,是烟草中的天然产物,是由一种常见的手性均聚物(S)-3-(1-叠氮基-丁-3-烯基)-吡啶15建立的。该均聚物的分子内氢硼化-环烷基化叠氮化物中间体15是吡咯烷环形成中的关键步骤。二亚乙基胺中间体(S)-烯丙基-(1-吡啶-3-基-丁-3-烯基)-氨基甲酸苄酯20的闭环复分解反应(RCM)是哌啶环形成中的关键步骤。从市售的3-吡啶甲醛13中,描述了一种简便,简便的烟草生物碱对映体合成方法:(S)-去甲烟碱1(5个步骤,