Substitution of the angular aldehyde by halogen in cardiosteroids in two steps was studied. The first step was oxidation of the aldehyde and production of the cooresponding 19-carboxylic acids; the second, decarboxylation of the 19-carboxylic acids using N-chlorosuccinimide or chloride salts. The 10-chloro-19norcardiosteroids: 10-chloro-19-norstrophanthidine (1), 10-chloro-19-norcymarin (2), 10-chloro-19norconvallatoxin (3), 10-chloro-19-norstrophalloside (4), and 10-chloro-19-norbovoside A (5) were prepared for the first time. The intermediates strophalloside-19-carboxylic acid and bovoside A-19-carboxylic acid were also prepared for the first time and characterized.
研究人员分两步对心血类
固醇中的角醛进行了卤素取代。第一步是氧化醛,生成相应的 19
羧酸;第二步是使用 N-
氯代琥珀
酰亚胺或
氯化物盐对 19
羧酸进行脱羧。首次制备出了 10-
氯-19-去甲心甾烷类化合物:10-
氯-19-去甲托烷(1)、10-
氯-19-去甲
香豆素(2)、10-
氯-19-去甲
金刚烷毒素(3)、10-
氯-19-去甲托叶苷(4)和 10-
氯-19-去甲托叶苷 A(5)。此外,还首次制备出了中间体 Strophalloside-19-carboxylic acid 和 bovoside A-19-carboxylic acid,并对其进行了表征。