Chemoselective trifluoromethylation of the C N group of α-iminoketones derived from arylglyoxals
作者:Emilia Obijalska、Marcin K. Kowalski、Grzegorz Mlostoń、Anthony Linden、Heinz Heimgartner
DOI:10.1016/j.jfluchem.2014.09.002
日期:2014.12
Chemoselective addition of (trifluoromethyl)trimethylsilane to the C=N group of N-(tert-butyl)-alpha-iminoketones in the presence of a fluoride ion as a catalyst was achieved under acidic conditions. Subsequent diastereoselective reductions of the obtained alpha-amino-alpha-(trifluoromethyl)ketones led to beta-amino-beta-(trifluoromethyl) alcohols in very good yields and high diastereoselectivities. Different reducing agents were tested; the reduction performed with LiAlH4 and Raney-Ni, respectively, afforded the desired diastereoisomers in a reversed ratio. (C) 2014 Elsevier B.V. All rights reserved.