Enolizable ketones react with m-nitroaniline in the presence of strong base such as t-BuOK to give 4- and 6-substituted nitroindoles. The reaction proceeds via oxidative nucleophilic substitution of hydrogen in m-nitroaniline with enolate anions in positions ortho to the amino group giving anionic σH adducts that are additionally stabilized by intramolecular interaction between the amino and the carbonyl
Asymmetric reduction of aryl imines using Candida parapsilosis ATCC 7330
作者:T. Vaijayanthi、Anju Chadha
DOI:10.1016/j.tetasy.2007.11.039
日期:2008.1
A highly enantioselective one pot, novel biocatalytic method for the asymmetric reduction of arylimines is reported. Treatment of arylimines with Candida parapsilosis ATCC 7330 in aqueous medium produces the enantiomerically pure (R)-secondary amines in moderate to good yields (55–80%) with excellent enantiomeric excesses (95–>99%).