2-bromoethyl (2E,6E,10E)-13-((1R,2R,4aR,8aS)-2-hydroxy-2,5,5,8a-tetramethyl-6-oxodecahydronaphthalen-1-yl)-2,6,10-trimethyltrideca-2,6,10-trienoate 、
乙酰基-11-酮基-beta-乳香酸 在
potassium carbonate 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
以78%的产率得到2-(((2E,6E,10E)-13-((2R,8aS)-2-hydroxy-2,5,5,8a-tetramethyl-6-oxodecahydronaphthalen-1-yl)-2,6,10-trimethyltrideca-2,6,10-trienoyl)oxy)ethyl (3R,4R,6aR,6bS,8aR,11R,12S,12aR,14bS)-3-acetoxy-4,6a,6b,8a,11,12,14b-heptamethyl-14-oxo-1,2,3,4,4a,5,6,6a,6b,7,8,8a,9,10,11,12,12a,14,14a,14b-icosahydropicene-4-carboxylate