A general approach to high-yielding asymmetric synthesis of chiral 3-alkyl-4-nitromethylchromans via cascade Barbas–Michael and acetalization reactions
作者:Dhevalapally B. Ramachary、M. Shiva Prasad、R. Madhavachary
DOI:10.1039/c0ob00861c
日期:——
A general approach to the high-yielding asymmetric synthesis of chiral 3-alkyl-4-nitromethylchromans as drug intermediates was achieved through cascade Barbas–Michael and acetalization (BMA) reactions on 2-(2-nitrovinyl)phenols with aldehydes in the presence of a catalytic amount of (R)-DPPOTMS and PhCO2H. Herein, we have also demonstrated the application of chiral BMA products in the synthesis of