propyl (2Z)-3-amino-(4-pyridinyl)-2-butenoate 、
3-benzoylpyrrolo[2,1-c][1,4]benzoxazine-1,2,4-trione 以
苯 为溶剂,
以89%的产率得到isopropyl 3-benzoyl-4-hydroxy-1-(o-hydroxyphenyl)-5-oxo-2,5-dihydro-1H-pyrrolo-2-spiro-3'-(2-oxo-5-(3-pyridyl)-2,3-dihydro-1H-pyrrole-4-carboxylate)