Reaction of anthranilamides with levulinic acids. Synthesis of 2,3,3a,4-tetrahydropyrrolo(2,1-b)quinazoline-1,9-diones.
作者:MASATOSHI YAMATO、YASUO TAKEUCHI
DOI:10.1248/cpb.30.1036
日期:——
The reaction of 2-(methylamino) benzamide with levulinic acid gave 3a, 4-dimethyl-2, 3, 3a, 4-tetrahydropyrrolo [2, 1-b] quinazoline-1, 9-dione (2). 3a-Methyl-2, 3, 3a, 4-tetrahydropyrrolo [2, 1-b] quinazoline-1, 9-dione (6) was prepared by the method shown in Chart 3. The compounds 2 and 6 were different from authentic samples A and B prepared by the method reported by previous workers. The real structures of A and B were found to be 3a-methyl-2, 3, 3a, 4-tetrahydropyrrolo [1, 2-a] quinazoline-1, 5-dione (9) and 3-(2, 3-dimethyl-4-oxo-1, 2, 3, 4-tetrahydro-2-quinazolinyl) propionic acid (10), respectively.
2- (甲基氨基) 苯甲酰胺与乙酰丙酸反应生成 3a,4-二甲基-2,3,3a,4-四氢吡咯 [2,1-b] 喹唑啉-1,9-二酮 (2)。3a-甲基-2,3,3a,4-四氢吡咯并[2,1-b]喹唑啉-1,9-二酮(6)按图 3 所示方法制备。化合物 2 和 6 与前人报道的方法制备的真实样品 A 和 B 不同。发现 A 和 B 的真实结构分别为 3a-甲基-2,3,3a,4-四氢吡咯并[1,2-a] 喹唑啉-1,5-二酮(9)和 3-(2,3-二甲基-4-氧代-1,2,3,4-四氢-2-喹唑啉基)丙酸(10)。