ethyl (5β,8α,9β,10α,13α)-8-ethenyl-13-methyl-13-{(E)-[2-(4-nitrophenyl)hydrazinylidene]methyl}podocarpan-15-oate 在
三氟化硼乙醚 作用下,
以
乙醚 、
甲苯 为溶剂,
反应 2.0h,
以75%的产率得到ethyl (3S,6aR,6bS,8aS,9R,12aS,12bS)-1,3,5,6,6a,7,8,8a,9,10,11,12,12a,12b-tetradecahydro-3,9,12a-trimethyl-5-(4-nitrophenyl)-2H-3,6b-methanonaphtho[2',1': 3,4]cyclohepta[1,2-c]pyrazole-9-carboxylate