Enantioselective Syntheses
of 2-Substituted Pyrrolidines from Allylamines by Domino Hydroformylation-Condensation:
Short Syntheses of (<i>S</i>)-Nicotine and the
Alkaloid 225C
作者:Günter Helmchen、Pierre Dübon、Andreas Farwick
DOI:10.1055/s-0029-1217165
日期:——
2-substituted pyrrolidines based on rhodium-catalyzed hydroformylations of allylamines and their N-alkyl and N-acyl derivatives, which were prepared by asymmetric allylic substitutions, are described. The outcome of the hydrofonnylation reaction was controlled by the substituent at nitrogen, not by the substituent at carbon. In the case of N-alkylallylamines in situ reduction to the pyrrolidines occurred
描述了基于铑催化的烯丙胺及其 N-烷基和 N-酰基衍生物的氢甲酰化的手性 2-取代吡咯烷的短路线,这些衍生物是通过不对称烯丙基取代制备的。氢甲酰化反应的结果受氮上的取代基控制,而不是受碳上的取代基控制。在 N-烷基烯丙胺原位还原为吡咯烷的情况下,N-酰基衍生物形成半缩胺醛和伯胺环亚胺。介绍了 (S)-尼古丁和生物碱 225C 的非常短的合成过程。