[5aR-(5aα,6α,7β,9aα,9bα)]-3b,4,5,5a,6,7,9a,9b,10,11-decahydro-5a,6,7,9a-tetrahydroxy-9b-methyl-7-(1-methylethyl)-phenanthro[1,2-c]furan-1(3H)-one 在
吡啶 、
丁二酸酐 、
4-二甲氨基吡啶 作用下,
以
DMF (N,N-dimethyl-formamide) 为溶剂,
反应 24.0h,
生成 [3bS-(3bα,5α,5aβ,6β,7α,9aβ,9bβ)]-mono[1,3,3b,4,5,5a,6,7,9a,9b,10,11-dodecahydro-5a,9a-dihydroxy-9b-methyl-7-(1-methylethyl)-1-oxo-5,7-epoxyphenanthro[1,2-c]furan-6-yl] ester of butanedioic acid