N-Trimethylsilyloxyenamines as new aldehyde enolate synthons: general,efficient and diastereoselective aldol reaction with ketals and acetals

摘要

(E)-N-Trimethylsilyloxyenamines, easily accessible from aldonitrones, proved to be excellent nucleophiles in TMSOTf-induced diastereoselective aldol reaction, both with ketals and acetals, proceeding via an extended transition state and leading to a new aldol C-C-bond in the aldonitrone products, that can be readily hydrolysed to the corresponding aldehydes.