First Synthesis of Totally Orthogonal Protected α-(Trifluoromethyl)- and α-(Difluoromethyl)arginines
摘要:
The first synthesis of a series of totally orthogonal protected racemic alpha-(trifluoromethyl)- and alpha-(difluoromethyl)arginines is described. The key steps of the synthesis are the mild guanidinylation procedure and the selective hydrogenation of a CC triple bond in the presence of a Cbz-group.
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.