2,2-Dimethyl-propionic acid (3S,9S,10S,13S,14S,17S)-3-acetoxy-13-methyl-10-(tetrahydro-pyran-2-yloxymethyl)-2,3,4,9,10,11,12,13,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-17-yl ester 以
乙醚 为溶剂,
以38 mg的产率得到2,2-Dimethyl-propionic acid (1S,3aS,7aS)-4-[2-[(S)-5-acetoxy-2-[1-(tetrahydro-pyran-2-yloxy)-meth-(E)-ylidene]-cyclohex-(Z)-ylidene]-eth-(E)-ylidene]-7a-methyl-octahydro-inden-1-yl ester