A highly efficient and practical new PEG-bound bi-cinchona alkaloid ligand for the catalytic asymmetric aminohydroxylation of alkenes
作者:Xi-Wen Yang、Han-Quan Liu、Ming-Hua Xu、Guo-Qiang Lin
DOI:10.1016/j.tetasy.2004.05.007
日期:2004.6
A new recyclable PEG-bound bi-cinchona alkaloid ligand has been developed for homogeneous catalyticasymmetricaminohydroxylation; it can be easily recovered by precipitation and reused more than five times without any significant loss in its catalytic efficiency.
Resolution of 2-hydroxy-3-amino-3-phenylpropionamide and its conversion
申请人:Chiragene, Inc.
公开号:US06025516A1
公开(公告)日:2000-02-15
The present invention provides an efficient route to the C-13 side chain of the anti-cancer drug paclitaxel (TAXOL) and its analogs. The process includes the resolution of racemic erythro 2-hydroxy-3-amino-3-phenylpropionamide by diastereomeric crystallization and its conversion via various intermediates to the threo-ethylester and threo-methylester isomers.