3-p-bromobenzoyl-2,4-dihydro-1H-pyrrolo[2,1-c][1,4]benzoxazine-1,2,4-trione 、
3-phenylaminobut-2-enoic acid ethyl ester 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-phenyl-2,3-dihydro-1H-pyrrole-4-carboxylate)