Effects of the β-methyl group at C-10 and some oxygen functions (=O, OH, OAc) at C-11, C-17, and C-20 on the rates of hydrogenation of 3-oxo-4-ene steroids have been studied with palladium catalyst in pyridine or THF/HBr as solvent. In contrast to the hydrogenation in pyridine, the rate in THF/HBr was greatly depressed by the presence of 10β-methyl group. The reactivity of the steroids was enhanced
C-10 处的 β-甲基和 C-11、C-17 和 C-20 处的一些氧官能团(=O、OH、OAc)对 3-oxo-4-ene 类
固醇加氢速率的影响已经在
吡啶或 THF/HBr 作为溶剂中用
钯催化剂进行了研究。与
吡啶中的氢化相反,10β-甲基的存在大大降低了 THF/HBr 中的氢化率。类
固醇的反应性通过氧官能团增强,特别是通过 11, 17-二氧代基团。基于获得的结果,从机理考虑讨论了取代基的影响。