Catalytic Action of Azolium Salts. IX. Synthesis of 6-Aroyl-9H-purines and Their Analogues by Nucleophilic Aroylation Catalyzed by Imidazolium or Benzimidazolium Salt.
作者:Akira MIYASHITA、Yumiko SUZUKI、Ken-ichi IWAMOTO、Takeo HIGASHINO
DOI:10.1248/cpb.46.390
日期:——
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。