【摘要】 <正>据文献报道,具有雌甾-4.9-二烯-3-酮结构单元的甾体化合物之乙酰溴-乙酸酐的作用下~[1]或在钯一炭催化的条件下~[2],可导致A环的芳构化.此反应已被用以制备具有雌激素活性的更多还原

【Abstract】 The Ring-A aromatization of 11β-hydroxyl or 11β-methoxyl estra-4,9-diene deriva- tives was studied.. It was found that these estradiene derivatives would give rise to estra-1,3,5(10), 9(11)-tetraens when treated with acidic catalyst in protonic solvents. A estra-4,9,11-Irene-3, 17-dione intermediate mechanism was suggested and partly confirmed by further investigation. The aromatization process can also be catalyzed by Iodine.更多还原