Evaluation of Electrophilic Heteroaromatic Substitution: Synthesis of Heteroaromatic-Fused Pyrimidine Derivatives via Sequential Three-Component Heterocyclization
作者:Fung Fuh Wong、Yu-Ying Huang、Chun-Hsi Chang
DOI:10.1021/jo301463m
日期:2012.10.5
A new sequential three-component heterocyclization was developed by reacting aromatic and heterocyclic substrates, including aminobenzenes, 1-aminonaphthalene, 2-aminopyrazines, 5-aminopyrazoles, 3-aminopyridine, 5-aminopyrimidine, 5-aminoquinoline, and 8-aminoquinoline, with formamide in the presence of PBr3. The reaction gave the corresponding pyrazolo[3,4-d]pyrimidines in good yields (59–96%), except
通过使芳香族和杂环底物(包括氨基苯,1-氨基萘,2-氨基吡嗪,5-氨基吡唑,3-氨基吡啶,5-氨基嘧啶,5-氨基喹啉和8-氨基喹啉)与甲酰胺反应,开发了一种新的顺序三组分杂环化方法在PBr 3存在下。除氨基苯和3-氨基吡啶外,该反应以较高的收率(59-96%)得到了相应的吡唑并[3,4- d ]嘧啶。提出了包括三步酰胺化,亲电取代亚胺化和氧化环化的合理反应机理,以解决杂环化问题。发现反应的反应性与芳族或杂环底物的亲电子性成比例。