Asymmetric Vinylogous Mannich Reaction of Silyloxy Furans with <i>N</i>-<i>tert</i>-Butanesulfinyl Ketimines
作者:V. U. Bhaskara Rao、Amol P. Jadhav、Dnyaneshwar Garad、Ravi P. Singh
DOI:10.1021/ol4037117
日期:2014.2.7
A highly regio- and diastereoselective TMSOTf promoted vinylogousMannichreaction for the synthesis of chiral quaternary 3-aminooxindole butenolides from 2-silyloxy furans and chiral ketimines is described. The method is found to be very efficient and also provides a facile access to sterically challenging 3-aminooxindole butenolides bearing two quaternary centers in continuation. Further, the versatility