Brønsted acid-catalyzed C–C bond forming reaction for one step synthesis of oxazinanones
摘要:
An efficient Bronsted acid-catalyzed synthesis of oxazinanones (2) from corresponding Boc-imines (1) in one-step has been developed. Oxazinanones are obtained via an unprecedented tandem elimination-cycloaddition reaction. The reaction is remarkably significant given its novelty, mild reaction conditions, simplicity and low cost of the catalyst system. (C) 2011 Elsevier Ltd. All rights reserved.
An enantioselective direct Mannichreaction of acetyl-acetone with enecarbamates via protonation by a chiral monophosphoric acid catalyst is achieved, demonstrating the utility of in situ generation of unstable aliphaticimines.