A novel C3-symmetric prolinol-squaramide catalyst for the asymmetric reduction of ketones by borane
作者:Xiang-Fei Wu、Chang Min、Enkhtsetseg Nyamzundui、Hai-Bing Zhou、Chune Dong
DOI:10.1016/j.tetasy.2011.09.020
日期:2011.9
A novel C-3-symmetric prolinol-squaramide has been developed for the asymmetric reduction of ketones by borane. By using only 5 mol % catalyst la for the reaction, high yields and excellent enantioselectivities (up to 95% yield, 93% ee) were obtained. Moreover, la can be easily recovered by simple precipitation and re-used for four cycles without losing the selectivity. (C) 2011 Elsevier Ltd. All rights reserved.