Patent ID: 9102660
Filing Date: 2015-08-11
Classification: A61P,C07C,C07D

Abstract:
1. A process for the preparation of a compound of Formula I, or a pharmaceutically acceptable salt thereof: the process comprising: coupling a meso anhydride of Formula III with an ester compound of Formula IV in the presence of a chiral ligand, to provide a compound of Formula V: coupling the compound of Formula V with a compound of Formula VI to form a thiol, hydrolyzing the thiol with a hydrolyzing agent to form a compound of Formula VIII; deprotecting the compound of Formula VIII to form the compound of Formula II: coupling the compound of Formula II with a PEG-maleimide compound to form the compound of Formula I; wherein X is O or CH Z is O or CH L is p=0 or 1; r=1-8; t=1, 2 or 3; w=1, 2, or 3; PEG is a polyethylene glycol moiety; R R