Catalytic Action of Azolium Salts. II. Aroylation of 4-Chloroquinazolines with Aromatic Aldehydes Catalyzed by 1,3-Dimethylbenzimidazolium Iodide.
作者:Akira MIYASHITA、Hideaki MATSUDA、Chihoko IIJIMA、Takeo HIGASHINO
DOI:10.1248/cpb.40.43
日期:——
When a mixture of 4-chloroquinazoline (7), an aromatic aldehyde 6, sodium hydride, and a catalytic amount of 1, 3-dimethylbenzimidazolium iodide (1) in tetrahydrofuran (THF) was refluxed with stirring for an appropriate time, the chlorine atom of 7 was replaced with the aroyl group, and the 4-aroylquinazolines 10 were obtained in excellent yields. Similar treatments of 4-chloro-2-methylquinazoline (8) and 4-chloro-2-phenylquinazoline (9) led to the 4-aroyl-2-methylquinazolines 11 and the 4-aroyl-2-phenylquinazolines 12, respectively.Use of N, N-dimethylformamide (DMF) instead of THF as the reaction solvent in the above reaction reduced the reaction time and increased the yields of the ketones 10 and 12 as compared with those in THF.
当4-氯喹唑啉(7)、芳香醛6、氢化钠和催化量的1,3-二甲基苯并咪唑碘化物(1)在四氢呋喃(THF)中搅拌回流适当时间后,7中的氯原子被芳酰基取代,得到产率极佳的4-芳酰基喹唑啉10。类似地处理4-氯-2-甲基喹唑啉(8)和4-氯-2-苯基喹唑啉(9),分别得到4-芳酰基-2-甲基喹唑啉11和4-芳酰基-2-苯基喹唑啉12。在上述反应中使用N,N-二甲基甲酰胺(DMF)而非THF作为反应溶剂,相比THF,可以缩短反应时间并提高酮10和12的产率。