3-phenylaminobut-2-enoic acid ethyl ester 、
3-benzoylpyrrolo[2,1-c][1,4]benzoxazine-1,2,4-trione 以
苯 为溶剂,
以80%的产率得到ethyl 3-benzoyl-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)