Stereoselective Synthesis of Enantiomerically Pure Isoxa-zolidine-fused d-Lactams
摘要:
Enantiomerically pure isoxazolidine-fused delta-lactams have been obtained by intramolecular nitrone cycloaddition starting from homochiral amido aldehydes. The stereocenter of the homochiral precursor controls the stereochemical course of the process.
Stereoselective Synthesis of Enantiomerically Pure Isoxa-zolidine-fused d-Lactams
摘要:
Enantiomerically pure isoxazolidine-fused delta-lactams have been obtained by intramolecular nitrone cycloaddition starting from homochiral amido aldehydes. The stereocenter of the homochiral precursor controls the stereochemical course of the process.
Synthesis of carboxylic amides by ring-opening of oxazolidinones with Grignard reagents
作者:David Bensa、Iain Coldham、Pia Feinäugle、Ravindra B. Pathak、Roger J. Butlin
DOI:10.1039/b800849c
日期:——
including allyl, benzyl, alkyl and phenyl magnesium halides. The organomagnesium species attacks the carbonyl group and promotes ring-opening of the oxazolidinone. The product tertiary amides are useful substrates for stereoselective transformations and were applied to a highly selective enolate alkylation and to a ring-closing metathesis reaction to a six-membered lactam and hence a formal synthesis of the