Chiral spiroaminoborate ester as a highly enantioselective and efficient catalyst for the borane reduction of furyl, thiophene, chroman, and thiochroman-containing ketones
作者:Viatcheslav Stepanenko、Melvin De Jesús、Wildeliz Correa、Lorianne Bermúdez、Cindybeth Vázquez、Irisbel Guzmán、Margarita Ortiz-Marciales
DOI:10.1016/j.tetasy.2009.11.009
日期:2009.12
Prochiral heteroaryl ketones containing furan, thiophene, chroman, and thiochroman moieties were successfully reduced in the presence of 1-10 mol% of spiroaminoborate ester 1 with different borane sources to afford non-racemic alcohols in up to 99% ee. In addition, modest enantioselectivity, around 80% ee, was achieved in the reduction of linear alpha,beta-unsaturated heteroaryl ketones. (C) 2009 Elsevier Ltd. All rights reserved.