Synthesis of 6-styryldihydropyrimidinones and 6-styryldihydropyridinones via the respective 6-alkylphosphonates
作者:Rufus Smits、Sergey Belyakov、Marina Petrova、Vladislav Kozhich、Ruslan Muhamadejev
DOI:10.1007/s10593-023-03145-7
日期:2022.12
with 6-bromomethyl-3,4-dihydropyrimidin-2(1H)-one or analogous 6-bromomethyl-3,4-dihydropyridin-2(1H)-one provided the respective 6-alkylphosphonates in excellent yields. The heterocyclic alkylphosphonates are useful synthons in the Horner–Wadsworth–Emmons reaction for introducing a styryl moiety. Bromination of 6-methyl-4-phenyl-3,4-dihydropyridin-2(1H)-one with NBS in methanol resulted in an unexpected
Arbuzov 反应中的亚磷酸三甲酯或三乙酯与 6-溴甲基-3,4-二氢嘧啶-2(1 H )-一或类似的 6-溴甲基-3,4-二氢吡啶-2(1 H )-一提供相应的 6-烷基膦酸盐以优异的收率。杂环烷基膦酸酯是 Horner-Wadsworth-Emmons 反应中用于引入苯乙烯基部分的有用合成子。在甲醇中用 NBS溴化 6-methyl-4-phenyl-3,4-dihydropyridin-2(1 H )-one 得到意想不到的化合物,而在氯仿中用溴溴化得到预期的 6-bromomethyl-3,4- dihydropyridin-2(1 H )-one,容易进行亲核取代。中间体和产物通过单晶X射线衍射验证。