描述:
lead(IV) tetraacetate 、 [(2Z)-2-[(8'R,9'S,10'R,13'S,14'S)-10',13'-dimethylspiro[1,3-dioxolane-2,3'-2,4,7,8,9,11,12,14,15,16-decahydro-1H-cyclopenta[a]phenanthrene]-17'-ylidene]-2-formamidoethyl] acetate 以80%的产率得到(8R,9S,10R,13S,14S,17R)-17-(2-acetoxy-1-(formylimino)ethyl)-10,13-dimethyl-1,2,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydrospiro[cyclopenta[a]phenanthrene-3,2'-[1,3]dioxolan]-17-yl acetate