rac-(4S*,5R*)-2-(4-Chloro-2-ethoxy-5-methanesulfonyl-phenyl)-4,5-bis-(4-chloro-phenyl)-4,5-dimethyl-4,5-dihydro-imidazole-1-carbonyl chloride 、
1-[2-((S)-2,2-Dimethyl-[1,3]dioxolan-4-yl)-ethyl]-piperazin-2-one 以to give rac-4-[(4S,5R)-2-(4-Chloro-2-ethoxy-5-methanesulfonyl-phenyl)-4,5-bis-(4-chloro-phenyl)-4,5-dimethyl-4,5-dihydro-imidazole-1-carbonyl]-1-((S)-3,4-dihydroxy-butyl)-piperazin-2-one after deprotection of the bis-acetonide intermediate with 2N hydrochloric acid的产率得到rac-4-[(4S,5R)-2-(4-chloro-2-ethoxy-5-methanesulfonylphenyl)-4,5-bis(4-chlorophenyl)-4,5-dimethyl-4,5-dihydroimidazole-1-carbonyl]-1-((S)-3,4-dihydroxybutyl)piperazin-2-one