摘要:
The preparation of 5-substituted 2,3-methanopyrrolidines by the stereoselective cyclization of zincated alpha-amino nitriles derived from enantiopure alpha-branched homoallylamines has been investigated. The formation of trans adducts in excellent diastereoselectivities (up to > 98:2) and good yields (up to 71%) is observed. The absolute configuration and enantiomeric excess are dependent on the nitrogen protecting group.