23,23-Difluoro-3β-tetrahydropyranyloxychol-5-en-24-oic Acid Methyl Ester 在
lithium aluminium tetrahydride 作用下,
以
乙醚 为溶剂,
以86%的产率得到(R)-4-[(3S,8S,9S,10R,13R,14S,17R)-10,13-Dimethyl-3-(tetrahydro-pyran-2-yloxy)-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl]-2,2-difluoro-pentan-1-ol