3beta-胆甾烷醇 、
1-fluoro-2-O-methoxycarbonyl-D-desosamine 在
Cp
2HfCl
2*AgClO
4 作用下,
以
二氯甲烷 为溶剂,
反应 0.25h,
以92%的产率得到[(2S,3R,4S,6R)-4-(dimethylamino)-2-[[(3S,8R,9S,10S,13R,14S,17R)-10,13-dimethyl-17-[(2R)-6-methylheptan-2-yl]-2,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-3-yl]oxy]-6-methyloxan-3-yl] methyl carbonate