3-Methoxy-7,8-dihydrobenzo[c]phenanthren-5-ol 、
ethyl N-[4-[1-[4-(ethoxycarbonylamino)phenyl]-1-hydroxyprop-2-ynyl]phenyl]carbamate 在
camphor-10-sulfonic acid 作用下,
以
甲苯 为溶剂,
反应 2.0h,
生成 ethyl N-[4-[5-[4-(ethoxycarbonylamino)phenyl]-10-methoxy-6-oxapentacyclo[12.8.0.02,7.08,13.015,20]docosa-1(14),2(7),3,8(13),9,11,15,17,19-nonaen-5-yl]phenyl]carbamate