In the presence of 1, 3-dimethylimidazolium iodide (1), 6-chloro-9-phenyl-9H-purine (7) and 4-chloro-5, 6-dimethylpyrrolo[2, 3-d]pyrimidines 40-42 undrwent uncleophilic aroylation with arenecarbaldehydes (5) to give the corresponding fused aroylpyrimidines 8 and 43-45. 1, 3-Dimethylbenzimidazolium iodide (2) was an effective catalyst for the similar synthesis of 7-aroyl-3-phenyl-3H-1, 2, 3-triazolo[4, 5-d]pyrimidines 16-21. In the synthesis of 4-aroyl-1H-pyrazolo[3, 4-d]pyrimidines 26-32, both azolium salts 1 and 2 were effective as catalysts. Moreover, 4-aroyl-7H-pyrrolo[2, 3-d]pyrimidines 43-45 were obtained in good yields via the 4-tosyl derivatives, in the presence of catalytic amounts of sodium p-toluenesulfinate (46) and the imidazolium salt 1. This catalytic aroylation was found to be a facile and useful method for the synthesis of 6-aroyl-9H-purines and their analogues.
在1, 3-二甲基
咪唑鎓
碘化物(1)的存在下,6-
氯-9-苯基-9H-
嘌呤(7)和4-
氯-5, 6-二甲基
吡咯并[2, 3-d]
嘧啶(40-42)与
芳烃醛(5)发生亲核芳酰化反应,生成相应的融合芳酰
嘧啶(8和43-45)。1, 3-二甲基
苯并咪唑鎓
碘化物(2)是合成7-酰基-3-苯基-3H-1, 2, 3-三唑并[4, 5-d]
嘧啶(16-21)的有效催化剂。在合成4-酰基-1H-
吡唑并[3, 4-d]
嘧啶(26-32)中,
咪唑盐(1和2)均表现出良好的催化效果。此外,通过4-托
磺酸衍
生物,在催化量的
对甲苯磺酸钠(46)和
咪唑盐(1)的存在下,获得了良好产率的4-酰基-7H-
吡咯并[2, 3-d]
嘧啶(43-45)。这种催化芳酰化反应被发现是一种简便而有效的方法,用于合成6-酰基-9H-
嘌呤及其类似物。