Efficient preparation of Ellman’s imines from trifluoromethyl ketones promoted by zirconium(IV) tert-butoxide
作者:Toshio Kawanami、Alexander S. Karns、Christopher M. Adams、Michael Serrano-Wu
DOI:10.1016/j.tetlet.2013.10.136
日期:2013.12
An efficient synthesis of chiral N-tert-butanesulfinyl trifluoromethyl ketimines by using zirconium(IV) tert-butoxide is described. Compared to conventional titanium(IV) ethoxide, this protocol gave better result especially for sterically hindered ketones. In addition to the high reactivity, a high degree of enantiopurity of the N-tert-butanesulfinyl group is retained. (C) 2013 Elsevier Ltd. All rights reserved.