(S)-11-Chloro-4-ethyl-10-nitro-3,14-dioxo-3,4,12,14-tetrahydro-1H-pyrano[3',4':6,7]indolizino[1,2-b]quinolin-4-yl acetate 、
正丁胺 以
1,4-二氧六环 为溶剂,
以73%的产率得到[(19S)-10-(butylamino)-19-ethyl-8-nitro-14,18-dioxo-17-oxa-3,13-diazapentacyclo[11.8.0.02,11.04,9.015,20]henicosa-1(21),2,4(9),5,7,10,15(20)-heptaen-19-yl] acetate