作者:Iain Coldham、Richard Hufton、Richard E Rathmell
DOI:10.1016/s0040-4039(97)01808-x
日期:1997.10
Cyclization of alpha-amino-organolithiums onto unactivated alkenes results in the formation of 2,4-disubstituted pyrrolidines with high selectivities in favour of the cis isomers. The use of the alpha-methylbenzyl chiral auxiliary on the nitrogen atom gives rise to 3-substituted pyrrolidines with up to 58% d.e. Without the chiral auxiliary, enantioselectivities in the presence of (-)-sparteine are poor. (C) 1997 Elsevier Science Ltd.