3-Trifluoromethyl- and 3-difluoromethyl-thalidomides
摘要:
Syntheses of racemic 3-trifluoromethyl- and 3-difluoromethyl-thalidomide starting from 2-(tert-butyloxycarbonylimino)-3,3,3-trifluoropropionate or -3,3-difluoropropionate as fluorine-containing building blocks are described. (C) 2003 Published by Elsevier Ltd.
New efficient syntheses of α-diflyoromethyl- and α-trifluoromethyl-ornithine
摘要:
A new efficient method far the preparation of ornithine derivatives 3-5 is described. The key step of the synthesis is the regioselective alkylation of imine 2 with propargyl amine 1. (C) 1997 Elsevier Science Ltd.