ditert-butyl (3S)-piperazine-1,3-dicarboxylate 、 (1R,4r)-4-((3'R,4'S,5'R)-6''-chloro-4'-(2-chloro-3-fluoropyridin-4-yl)-4,4-dimethyl-2''-oxodispiro[cyclohexane-1,2'-pyrrolidine-3',3''-indoline]-5'-carboxamido)cyclohexane-1-carboxylic acid 在
双(2-氧代-3-恶唑烷基)次磷酰氯 、
三乙胺 作用下,
以
4-(dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran 为溶剂,
以3%的产率得到di-tert-butyl (S)-4-((1R,4S)-4-((3'R,4'S,5'R)-6''-chloro-4'-(2-chloro-3-fluoropyridin-4-yl)-4,4-dimethyl-2''-oxodispiro[cyclohexane-1,2'-pyrrolidine-3',3''-indoline]-5'-carboxamido)cyclohexane-1-carbonyl)piperazine-1,3-dicarboxylate