4-[8-cyano-2-(3-ethyl-ureido)-9-methyl-9H-purin-6-yl]-piperazine-1-carboxylic acid tert-butyl ester 在
ammonium sulfide 作用下,
以
乙醇 为溶剂,
反应 18.0h,
以95.3%的产率得到4-[2-(3-ethyl-ureido)-9-methyl-8-thiocarbamoyl-9H-purin-6-yl]-piperazine-1-carboxylic acid tert-butyl ester