Synthesis of Pyrazolo[3,4-<i>b</i>]Pyridine and Pyrido[2′,3′:3,4]Pyrazolo [1,5-<i>a</i>]Pyrimidine Derivatives
作者:Mervat M. El-Enany、Salwa E. M. El-Meligie、Nadia A. Abdou、Hala B. El-Nassan
DOI:10.3184/030823410x12811125049438
日期:2010.8
The synthesis of two series of 1-phenyl and 1H-pyrazolo[3,4-b]pyridine is described. Thus, reacting 5-amino-1-phenylpyrazole with chalcone analogues gave 4,6-diarylpyrazolo[3,4-b]pyridine derivatives. While, reacting the same starting material with benzylidene derivatives of ethyl cyanoacetate and malononitrile resulted in 4-oxo and 4-aminopyrazolo[3,4-b]pyridine derivatives, respectively. The synthesis
描述了1-苯基和1H-吡唑并[3,4-b]吡啶两个系列的合成。因此,5-氨基-1-苯基吡唑与查耳酮类似物反应得到4,6-二芳基吡唑并[3,4-b]吡啶衍生物。同时,将相同的原料与氰乙酸乙酯和丙二腈的亚苄基衍生物反应分别产生4-氧代和4-氨基吡唑并[3,4-b]吡啶衍生物。还描述了从吡啶开始合成 3-氨基-4,6-二芳基吡唑并[3,4-b]吡啶。因此,4,6-二芳基吡啶酮衍生物的氯化以及它们随后与肼水合物的环化得到3-氨基-4,6-二芳基吡唑并[3,4-b]吡啶。后一种化合物与乙酰丙酮、乙氧基亚甲基氰基乙酸乙酯和查耳酮类似物反应得到三环吡啶并[2',3':3,4]吡唑并[1,5-a]嘧啶。