5-Benzoylamino-2-(5H-[1,3]dioxolo[4,5-f]indol-6-yl)-6-oxo-6H-pyran-3-carboxylic acid ethyl ester 在
potassium carbonate 作用下,
以
乙腈 为溶剂,
反应 10.0h,
以59%的产率得到Ethyl 4-benzamido-7-hydroxy-3-oxo-13,15-dioxa-2-azatetracyclo[8.7.0.02,8.012,16]heptadeca-1(17),4,6,8,10,12(16)-hexaene-6-carboxylate