Stereoselective synthesis of trans-2,3-disubstituted pyrrolidines via addition to N-acyliminium ions
摘要:
An efficient and stereoselective synthesis of trans-2,3-disubstituted pyrrolidines is described. The intermolecular alkylation of racemic N-acyliminium ions generated in situ from the corresponding 3-substituted lactams proceeds stereoselectively and in high yield. (c) 2006 Elsevier Ltd. All rights reserved.
Synthetic Versatility of<i>N</i>-(Silylmethyl)imines: Water-Induced Generation of<i>N</i>-Protonated Azomethine Ylides of Nonstabilized Type and Fluoride-Induced Generation of 2-Azaallyl Anions
N-(Silylmethyl)imines generateN-protonatedazomethineylides of nonstabilized type when treated with water in HMPA, which undergo stereospecific and regioselectivecycloadditions with electron-poo...
Transmetallation of n-(trialkylstannyl)methylimines. A new method for the generation and cycloaddition of 2-azaallyl anions.
作者:William H. Pearson、Daniel P. Szura、William G. Harter
DOI:10.1016/s0040-4039(00)80203-8
日期:1988.1
Transmetallation of imines 1 at −78° with RLi provided 2-azaallylanions 2, which readily undergo cycloaddition with olefinic anionophiles, providing pyrrolidines. Of particular note is the generation of unstabilized 2-azaallylanions for the first time (Table 1, entries 1–3).