Approaches to combinatorial synthesis of heterocycles: Solid phase synthesis of pyridines and pyrido[2,3-d]pyrimidines
作者:Mikhail F Gordeev、Dinesh V Patel、Jie Wu、Eric M Gordon
DOI:10.1016/0040-4039(96)00923-9
日期:1996.7
An efficient solid phase synthesis of diverse pyridines and pyrido[2,3-d]pyrimidines is described. O-Immobilized keto esters 2 react with aldehydes to afford Knoevenagel derivatives 3. These undergo Hantzsch-condensation with α-oxo enamines to generate 1,4-dihydropyridines 4 that are oxidized with CAN to produce immobilized pyridines 5. The method has been extended to synthesis of fused pyrido[2,3-d]pyrimidines
描述了多种吡啶和吡啶并[2,3-d]嘧啶的有效固相合成。O-固定化的酮酯2与醛反应,得到Knoevenagel衍生物3。它们与α-氧代烯胺进行汉茨缩合反应,生成1,4-二氢吡啶4,然后被CAN氧化,生成固定的吡啶5。该方法已扩展到使用6-氨基尿嘧啶作为α-氧代烯胺成分合成稠合的吡啶并[2,3-d]嘧啶。通过凝胶相13 C NMR光谱法研究了固相上的反应过程。该合成被设计为适合组合库的制备。