Stereoselective synthesis of (R)- and (S)-α-trifluoromethyl aspartic acid via titanium enolate addition to a sulfinimine of trifluoropyruvate
摘要:
The reaction of an enantiomerically pure sulfinimine of trifluoropyruvate with several metal enolates is described. The use of TiCl(O-iPr)(3)/LDA produced the corresponding sulfinamides with high stereocontrol. The latter could be smoothly transformed into each enantiomer of alpha-trifluoromethyl aspartic acid with high ee, which has been previously synthesized only in racemic form. (C) 2004 Elsevier Ltd. All rights reserved.