Diastereoselective Cyclisation ofN-Alkenylideneamines into 3,4-Dihydro-2H-pyrrol-1-ium Halides
作者:Daniela Schley、Jürgen Liebscher
DOI:10.1002/ejoc.200601081
日期:2007.6
2-(α-bromoalkyl)pyrrolinium salts and 2-(α-selenoalkyl)pyrrolidines were synthesized by the halocyclisation and selenocyclisation, respectively, of N-(alkenylidene)alkylamines and subsequent reduction. These cyclisations were implemented in a diastereomeric fashion for the first time. Substrate control (starting imines possessing chirality in the N-alkyl or the N-alkenyl substituent) and reagent control (chiral
许多新的手性 2-(α-溴烷基)吡咯啉盐和 2-(α-硒烷基)吡咯烷分别通过 N-(亚烯基)烷基胺的卤环化和硒环化以及随后的还原反应合成。这些环化首次以非对映体的方式进行。应用底物对照(在 N-烷基或 N-烯基取代基中具有手性的起始亚胺)和试剂对照(手性有机硒基溴)。亚烯基立体中心的不对称诱导或手性硒基溴对具有手性 N-烷基的不饱和亚胺的双重不对称诱导导致高达 84:16 的非对映选择性。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)