3-amino-β-digitoxosyl derivatives of cardioactive steroids. A 1,3 participation procedure, used under acid or mercury salt catalysis, and the imidate procedure were investigated. A careful fine tuning of the glycosylation conditions was necessary in order to obtain significant β-d-stereoselectivity, which proved to be mainly dependent on the polarity of the solvent and the relative reactivity of the sugar and the
摘要合成了3-
氨基数字氧糖(d-ristosamine)的
氨基甲酸酯衍
生物,目的是合成具有心脏活性的甾族化合物的3-
氨基-β-数字臭糖基衍
生物。研究了在酸或
汞盐催化下使用的1,3参与程序和亚
氨酸盐程序。为了获得显着的β-d-立体选择性,必须对糖基化条件进行仔细的微调,这被证明主要取决于溶剂的极性以及糖和亲核试剂的相对反应性。