PROCESS FOR PREPARING FIBRINOGEN RECEPTOR ANTAGONIST DERIVATIVES OF O-[4-(4-PIPERIDYNYL)BUTYL]-TYROSINE

摘要

The present invention relates to a process for preparing in 6 steps fibrinogen receptor antagonist derivatives of O-[4-(4-piperidynyl)butyl]-tyrosine of the formula: wherein R1 is a six- member saturated or unsaturated heterocyclic ring containing one or two heteroatoms, wherein the heteroatoms are N or NR6, wherein R6 is a C1-10 alkyl, m is an integer chosen from 2 to 6 ; and R4 is aryl, C1-10 alkyl or C4-10 aralkyl