A convenient enantioselective synthesis of 3-asymmetrically substituted oxindoles as progesterone receptor antagonists
作者:S. Alluri、H. Feng、M. Livings、L. Samp、D. Biswas、T.W. Lam、E. Lobkovsky、A.K. Ganguly
DOI:10.1016/j.tetlet.2011.05.120
日期:2011.7
A convenient enantioselective synthesis of 3-asymmetrically substituted oxindoles is reported. Compound (2) prepared by radical cyclisation of (1) was used for the synthesis of racemic and enantiomerically pure 3-asymmetrically substituted oxindoles. Desulfurisation of (2) using Raney Ni yielded the racemate (5). Addition of (S)-1-phenylethanol to compound (2) yielded the diastereoisomer (21) the structure of which was determined using X-ray crystallography. Using a sequence of steps (21) was converted to the enantiomer (8). The enantiomer (9) was similarly prepared from (2) using (R)-1-phenylethanol. (C) 2011 Elsevier Ltd. All rights reserved.