(+/-)-7-methoxy-8,10a-dimethyl-3-oxo-(4a
r,10a
t)-1,2,3,4,4a,9,10,10a-octahydro-phenanthrene-2-carboxylic acid methyl ester 、
碘甲烷 在
sodium methylate 作用下,
生成
(+-)-7-methoxy-2,8,10a-trimethyl-3-oxo-(4ar,10at)-1,2,3,4,4a,9,10,10a-octahydro-phenanthrene-2c-carboxylic acid methyl ester 、 (+-)-7-methoxy-2,8,10a-trimethyl-3-oxo-(4ar,10at)-1,2,3,4,4a,9,10,10a-octahydro-phenanthrene-2c-carboxylic acid methyl ester