Stereoselectivity in the synthesis of 2,5-disubstituted pyrrolidines
Abstract
Under homogeneous conditions, the silver(I)-catalysed cyclisation of the allenic amine derivatices (3a–c), thogh not (3d), is stereoselective giving cis-2,5-disubstituted pyrrolidines in high yield; cyclisation on (3a), using a heterogeneous silver(I)-catalyst, is nonstereoselective.