methyl (1S,2S,4aS,4bR,10aS)-1-[(E)-3-methoxy-3-oxoprop-1-enyl]-2,4b-dimethyl-4-oxospiro[1,3,4a,5,6,9,10,10a-octahydrophenanthrene-7,2'-1,3-dithiolane]-2-carboxylate 在
甲醇 、
magnesium 作用下,
反应 2.5h,
以76%的产率得到methyl (1S,2S,4aS,4bR,10aS)-1-(3-methoxy-3-oxopropyl)-2,4b-dimethyl-4-oxospiro[1,3,4a,5,6,9,10,10a-octahydrophenanthrene-7,2'-1,3-dithiolane]-2-carboxylate