O-ethyl-O-(4-chlorophenyl)thiophosphorochloride 、
10-羟基喜树碱 在
sodium hydroxide 作用下,
以
乙腈 为溶剂,
以77.5%的产率得到(19S)-7-[(4-chlorophenoxy)-ethoxyphosphinothioyl]oxy-19-ethyl-19-hydroxy-17-oxa-3,13-diazapentacyclo[11.8.0.02,11.04,9.015,20]henicosa-1(21),2(11),3,5,7,9,15(20)-heptaene-14,18-dione