15-ethyl-21-methyl-17-oxa-3,21-diazapentacyclo[11.8.0.02,11.04,9.014,19]henicosa-1(13),2,4,6,8,10,14(19)-heptaene-16,20-dione 在
copper diacetate 、
氧气 、
三乙胺 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
反应 4.0h,
以42%的产率得到15-Ethyl-15-hydroxy-21-methyl-17-oxa-3,21-diazapentacyclo[11.8.0.02,11.04,9.014,19]henicosa-1(13),2,4,6,8,10,14(19)-heptaene-16,20-dione