3-p-bromobenzoyl-2,4-dihydro-1H-pyrrolo[2,1-c][1,4]benzoxazine-1,2,4-trione 、
(E)-3-(4-甲基苯基)丁-2-烯酸乙酯 以
苯 为溶剂,
以90%的产率得到ethyl 3-(p-bromobenzoyl)-4-hydroxy-1-(o-hydroxyphenyl)-5-oxo-2,5-dihydro-1H-pyrrole-2-spiro-3'-(5-methyl-2-oxo-1-(p-tolyl)-2,3-dihydro-1H-pyrrole-4-carboxylate)