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 在
对甲苯磺酸 作用下,
以
甲醇 为溶剂,
反应 72.0h,
以66%的产率得到2,2-Dimethyl-propionic acid (3S,9S,10S,13S,14S,17S)-3-acetoxy-10-hydroxymethyl-13-methyl-2,3,4,9,10,11,12,13,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-17-yl ester