反应详情

Following a procedure similar to that described in Example 78(a), but using 2.25 g of ethyl 2-ethyl-4-(1-hydroxy-1-methylethyl)-1-{4-[2-(trityltetrazole-5-yl)phenyl]phenyl}methylimidazole-5-carboxylate [prepared as described in Example 68(a)] and using 203 mg of lithium hydroxide monohydrate for hydrolysis and 0.90 g of pivaloyloxymethylchloride for esterification, 2.53 g of the title compound wet obtained as a glass (purified by column chromatography through silica gel using a 1:1 by volume mixture o f ethyl acetate and hexane as the eluent).