3β-p-methoxyphenoxy-11,12-dioxo-ursa-28-oic acid 在
sodium tetrahydroborate 作用下,
以
甲醇 为溶剂,
反应 2.0h,
生成 (1S,2R,4aS,6aR,6aR,6bR,8aR,10S,12aS,13R,14S,14aR,14bS)-13,14-dihydroxy-10-(4-methoxyphenoxy)-1,2,6a,6b,9,9,12a-heptamethyl-2,3,4,5,6,6a,7,8,8a,10,11,12,13,14,14a,14b-hexadecahydro-1H-picene-4a-carboxylic acid 、 (1S,2R,4aS,6aR,6aR,6bR,8aR,10S,12aS,13S,14R,14aR,14bS)-13,14-dihydroxy-10-(4-methoxyphenoxy)-1,2,6a,6b,9,9,12a-heptamethyl-2,3,4,5,6,6a,7,8,8a,10,11,12,13,14,14a,14b-hexadecahydro-1H-picene-4a-carboxylic acid