Organocatalytic enantioselective amination of Morita-Baylis-Hillman carbonates with masked ammonia: A facile method for the synthesis of unprotected α-methylene-β-amino esters

摘要

Amination under the mask: The asymmetric allylic amination of MBH carbonates was achieved with masked ammonia (benzophenone imine) under the catalysis of modified cinchona alkaloids to give good yields with excellent enantioselectivities (up to 99% ee) for a wide range of MBH carbonates (see scheme).