3-phenylaminobut-2-enoic acid ethyl ester 、
3-(4-Methoxy-benzoyl)-benzo[b]pyrrolo[1,2-d][1,4]oxazine-1,2,4-trione 以
苯 为溶剂,
以87%的产率得到ethyl 4-hydroxy-1-(o-hydroxyphenyl)-3-(p-methoxybenzoyl)-5-oxo-2,5-dihydro-1H-pyrrole-2-spiro-3'-(5-methyl-2-oxo-1-phenyl-2,3-dihydro-1H-pyrrole-4-carboxylate)