Pseudokobusine 、
氯甲酸-2,2,2-三氯乙酯 在
sodium hydroxide 作用下,
以
二氯甲烷 为溶剂,
以78%的产率得到2,2,2-trichloroethyl (1R,4aR,5R,5aS,7R,9R,9aR,11aR,12S,13S)-9,13-dihydroxy-1-methyl-8-methylene-11-oxododecahydro-2H-4a,9a,7-(epiethane[1,1,2]triyl)-5,1-(epiminomethano)dibenzo[a,d][7]annulene-14-carboxylate