Asymmetric synthesis of oxindoles containing a quaternary stereogenic centre by catalytic O/C-carboxyl rearrangement
作者:Muhammad Ismail、Huy V. Nguyen、Gennadiy Ilyashenko、Majid Motevalli、Christopher J. Richards
DOI:10.1016/j.tetlet.2009.08.122
日期:2009.11
A catalysed O/C-carboxyl rearrangement generates the all-carbon stereogeniccentre in phenyl 1,3-dimethyl-5-methoxy-2-oxoindoline-3-carboxylate (up to 57% ee). Crystallisation and removal of racemic crystals enhance the ee to 95%. The X-ray crystal structure of the cobalt metallocene–pyrrolidinopyridine nucleophilic catalyst employed is reported.