专利号:US-5312923-A 优先权日:1992-02-28 标 题 :Process for preparing fibrinogen receptor antagonists 发明人:CHUNG JOHN Y L; HUGHES DAVID L; ZHAO DALIAN 权利人:MERCK & CO INC 摘要:The invention is a highly efficient synthesis for making compounds of the formula: wherein: R1 is a six membered saturated or unsaturated heterocyclic ring containing one or two heteroatoms wherein the heteroatoms are N; or NR6, wherein R6 is H or C1-10 alkyl; m is an integer from two to six; and R4 is aryl, C1-10 alkyl, or C4-10 aralkyl.