(3a,5b,12a)-3-(Benzoyloxy)-12-[(methylsulfonyl)oxy]-cholan-24-oic Acid Methyl Ester 在
N,N-二甲基丙烯基脲 、
potassium acetate 作用下,
反应 4.0h,
以88%的产率得到[(3R,5R,8S,9S,10S,13R,14S,17R)-17-[(2R)-5-methoxy-5-oxopentan-2-yl]-10,13-dimethyl-2,3,4,5,6,7,8,9,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-3-yl] benzoate