5-(2,5-dihydro-4-methyl-5-thioxo-1H-pyrrol-2-ylidenmethyl)-3-bromo-4-methyl-1H-pyrrol-2-carboxylic acid ethyl ester 、 在
1,8-二氮杂双环[5.4.0]十一碳-7-烯 作用下,
以
乙腈 为溶剂,
反应 2.0h,
以1.12 g的产率得到5-{5-[(t-butyloxycarbonyl)(5-cyano-2,3,4,5-tetrahydro-4,5-dimethyl-4-methoxycarbonylmethyl-1H-pyrrol-2-ylidene)methylthio]-4-methyl-2H-pyrrol-2-ylidenmethyl}-3-bromo-4-methyl-1H-pyrrol-2-carboxylic acid ethyl ester