9-ethyl-9-hydroxy-2,3,8,9-tetrahydro-5H-6-oxa-3a-azacyclohepta[f]indene-1,4,7-trione 、
N-(2-acetyl-3-aminophenyl)acetamide 在
对甲苯磺酸 作用下,
以
甲苯 为溶剂,
反应 10.5h,
以51%的产率得到N-(20-ethyl-20-hydroxy-10-methyl-14,18-dioxo-17-oxa-3,13-diazapentacyclo[11.9.0.02,11.04,9.015,21]docosa-1(22),2,4(9),5,7,10,15(21)-heptaen-8-yl)acetamide