Synthesis of 1,3-oxazino(5,6-c)isoquinolines and related compounds.
作者:MIYOKO TOYAMA、HIROTAKA OTOMASU
DOI:10.1248/cpb.33.5543
日期:——
Mannich reaction of 1-chloro-4-isoquinolinol (1) with dimethylamine and formalin afforded the base, 1-chloro-3-dimethylaminomethyl-4-isoquinolinol (2), and a by-product, 1, 1'-dichloro-3, 3'-methylenedi-4-isoquinolinol (3). The reaction of 1 with formalin in H2SO4 gave 6-chloro-1, 3-dioxino [5, 6-c] isoquinoline (4). The reactions of 1 with formalin and primary amines, and of 1 with acetaldehyde ammonia afforded the corresponding products, 1, 3-oxazino [5, 6-c] isoquinolines (5-7), in fair yields. Methyl 4-hydroxy-1-oxo-1, 2-dihydroisoquinoline-3-carboxylate (8) was converted into the carboxamide (9), which, on heating with a mixture of POCl3 and PCl5, afforded two chloro-cyano compounds 10 and 11 in a ratio of ca. 1 : 2. The reaction of 11 with hydrazine hydrate gave the 1-hydrazino compound (13).
1-
氯-4-
异喹啉醇(1)与
二甲胺和
福尔马林发生曼尼希反应,生成了碱性产物1-
氯-3-
二甲氨基甲基-4-
异喹啉醇(2)和一种副产物
1,1'-二氯-3,3'-亚甲基二-4-异喹啉醇(3)。将1与
福尔马林在
硫酸(H2SO4)中反
应得到6-
氯-1,3-二
氧杂-[5,6-c]
异喹啉(4)。1与
福尔马林和初级胺反应,以及1与
乙醛氨反应,分别获得相应的产物1,3-
噁唑基-[5,6-c]
异喹啉(5-7),产率较好。
4-羟基-1-
氧-1,2-二
氢异
喹啉-3-羧酸甲酯(8)被转化为羧
酰胺(9),在POCl3和
PCl5混合物加热下,生成了两种
氯氰化合物10和11,比例约为1:2。11与
水合
肼反
应得到1-
肼基化合物(13)。