benzyl (1S,4aR,6aS,7R,8R,10aR,10bR,12aR,14R,15R)-8-[(1R)-1,2-dimethylpropyl]-15-hydroxy-14-methoxy-1,6,6a,7,8,9,10,10a,10b,11,12,12a-dodecahydro-1,6a,8,10a-tetramethyl-4H-1,4a-propano-2H-phenanthro[1,2-c]pyran-7-carboxylate 、
1,1-dimethylethyl 4-ethyl-4-methyldihydro-1,2,3-oxathiazine-3(4H)-carboxylate 2,2-dioxide 在
18-冠醚-6 potassium hydride 作用下,
以
乙二醇二甲醚 为溶剂,
生成