2-[(4-methylphenyl)iminomethyl]aniline 、
Isopropyl-carbamic acid 4-hydroxy-3,6,10-trioxo-3,4,6,7,8,10-hexahydro-1H-pyrano[3,4-f]indolizin-4-ylmethyl ester 在
对甲苯磺酸 作用下,
以
甲苯 为溶剂,
反应 4.0h,
生成 (19-hydroxy-14,18-dioxo-17-oxa-3,13-diazapentacyclo[11.8.0.02,11.04,9.015,20]henicosa-1(21),2,4,6,8,10,15(20)-heptaen-19-yl)methyl N-propan-2-ylcarbamate