乙酸酐 、
(2R,3S)-3-Methoxycarbonyl-2-((1S,4aS,8aS)-5,5,8a-trimethyl-2-oxo-decahydro-naphthalen-1-ylmethoxy)-pentanedioic acid dimethyl ester 在
吡啶 、 lithium aluminium tetrahydride 作用下,
生成 Acetic acid (2R,3R)-5-acetoxy-3-acetoxymethyl-2-((1S,4aS,8aS)-5,5,8a-trimethyl-2-methylene-decahydro-naphthalen-1-ylmethoxy)-pentyl ester