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