Synthesis of Dendrimer-Supported Prolinols and Their Application in Enantioselective Reduction of Ketones
作者:Gang Zhao、Guang-yin Wang、Xin-yuan Liu
DOI:10.1055/s-2006-926253
日期:——
Optically active dendritic amino alcohols were synthesized and applied to catalyze the enantioselective borane reduction of various ketones with good yield and high enantiomeric excesses.
A series of chiral pyrrolidinylmethanol-based dendritic ligands were synthesized for application in enantioselectivearyltransferreactions to aldehydes with the (ArBO)3/ZnEt2 system in up to 98% ee.
An operationally simple and mild protocol for the catalytic enantioselective epoxidation of enones has been established using a series of chiral pyrrolidinylmethanol-based dendritic catalysts and tert-butyl hydroperoxide (TBHP) as an oxidant. The epoxides have been obtained in good yields and ee up to 78%. (c) 2006 Published by Elsevier Ltd.