The Flögel-three-component reaction with dicarboxylic acids – an approach to bis(β-alkoxy-β-ketoenamides) for the synthesis of complex pyridine and pyrimidine derivatives
作者:Mrinal K Bera、Moisés Domínguez、Paul Hommes、Hans-Ulrich Reissig
DOI:10.3762/bjoc.10.37
日期:——
carboxylic acids is presented. The use of dicarboxylic acids allowed the preparation of symmetrical bis(beta-ketoenamides) from simple starting materials in moderate yields. Cyclocondensations of these enamides to 4-hydroxypyridine derivatives or to functionalized pyrimidines efficiently provided symmetrically and unsymmetrically substituted fairly complex (hetero)aromatic compounds containing up to six conjugated
介绍了锂化烷氧基丙二烯、腈和羧酸的 Flogel-三组分反应的底物范围的扩展。二元羧酸的使用允许以中等产率从简单的起始材料制备对称的双(β-酮烯酰胺)。这些烯酰胺与 4-羟基吡啶衍生物或官能化嘧啶的环缩合有效地提供了对称和不对称取代的相当复杂的(杂)芳族化合物,其中包含多达六个共轭芳基和杂芳基。此外,还报道了通过钯催化偶联或氧化对所得杂环进行的后续功能化。我们还描述了一种结构有趣的大环双嘧啶衍生物的简单合成,该衍生物包含一个 17 元环,