tert-butyl 3-[2-[(1R,4aR,8aR)-1-methyl-3,6-dioxo-1,4,4a,5,8,8a-hexahydropyrano[3,4-c]pyridin-7-yl]ethyl]indole-1-carboxylate 在
Bischler-Napieralski reaction 作用下,
生成 tert-butyl (1S,15R,16R,20R)-16-methyl-18-oxo-17-oxa-3,13-diazapentacyclo[11.8.0.02,10.04,9.015,20]henicosa-2(10),4,6,8-tetraene-3-carboxylate