Convenient syntheses of 1, 2, 3, 4, 6, 7, 12, 12b-octahydroindolo[2, 3-α]quinolizine derivatives (4a, b) and a relatd unsaturated lactam (14) are described. The condensation of tryptamine (1) with 8a, b (prepared from 7a, b by decarboethoxylation), followed by treatment with alkali gave the lactams (4a, b), respectively. The stereochemistry of 4b was determined by conversion to the known cis- and trans-compounds (5b). The condensation of 1 with the sulfenylated ester (10), which was prepared in two ways, followed by treatment with alkali gave the lactams (12a, b). Oxidation of 12a, b with m-chloroperbenzoic acid gave the sulfoxides (13) which were heated at 50°C to give the lactams (14, 15) and the pyridone (16).
描述了一种便利的合成方法,可用于制备1、2、3、4、6、7、12和12b-八氢
吲哚[2, 3-α]
喹啉衍
生物(4a, b)及相关的不饱和内酰胺(14)。色
氨酸胺(1)与通过脱羧醇基化得到的8a, b进行缩合,随后用碱处理,分别得到内酰胺(4a, b)。通过转化为已知的顺式和反式化合物(5b),确定了4b的立体
化学。1与通过两种方式制备的含
硫酯(10)缩合,随后用碱处理得到内酰胺(12a, b)。用
氯过
苯甲酸(m-chloroperbenzoic acid)氧化12a, b,得到亚砜(13),在50°C加热后得到内酰胺(14, 15)和
吡啶酮(16)。