Benzoic acid (2R,3S,6S)-2-[2-((2S,3S)-3-hydroxymethyl-3-methyl-oxiranyl)-ethyl]-3,6-dimethyl-tetrahydro-pyran-3-yl ester 在
titanium(IV) isopropylate 作用下,
以
苯 为溶剂,
反应 12.0h,
以56%的产率得到(2R,4aR,6S,8aS)-Octahydro-2-<(S)-1,2-dihydroxy-1-methylethyl>-6,8a-dimethylpyrano<3,2-b>pyran