3-Ethyl-2,7,8-trimethyl-10H-dipyrrin-1-on 、
xanthobilirubinic acid methyl ester 在
2,3-二氯-5,6-二氰基-1,4-苯醌 作用下,
以
四氢呋喃 为溶剂,
反应 0.5h,
以85%的产率得到3-{5-[3-Ethyl-4-methyl-5-oxo-1,5-dihydro-pyrrol-(2Z)-ylidenemethyl]-2-[1-{5-[3-ethyl-4-methyl-5-oxo-1,5-dihydro-pyrrol-(2Z)-ylidenemethyl]-3,4-dimethyl-1H-pyrrol-2-yl}-meth-(Z)-ylidene]-4-methyl-2H-pyrrol-3-yl}-propionic acid methyl ester