Two-Step Synthesis of (<i>Z</i>)-2-[2-Oxo-2,3-dihydropyrido[2,3-<i>d</i>]pyrimidin-4(1<i>H</i>)-ylidene]acetamide Derivatives from 2-Chloro-6-methylpyridine-3-carbonitrile
作者:Kazuhiro Kobayashi、Daisuke Iitsuka、Osamu Morikawa、Hisatoshi Konishi
DOI:10.1055/s-2006-950380
日期:2007.1
(Z)-2-[1-Aryl-7-methyl-2-oxo-2,3-dihydropyrido[2,3-d]pyrimidin-4(1H)-ylidene]acetamides were prepared using a two-step sequence. The first step was the addition of magnesium enolates of tertiary acetamides to 2-chloro-6-methylpyridine-3-carbonitrile to give vinylogous urea derivatives, (Z)-3-amino-3-(2-chloro-6-methylpyridin-3-yl)propenamides. In the second step, these were reacted with aryl isocyanates in the presence of sodium hydride to give the corresponding pyrido[2,3-d]pyrimidin-2(1H)-one derivatives.
通过两步顺序合成了(Z)-2-[1-芳基-7-甲基-2-氧代-2,3-二氢吡啶并[2,3-d]嘧啶-4(1H)-亚基]乙酰胺。第一步是将三元乙酰胺的镁烯醇化物加成到2-氯-6-甲基吡啶-3-腈,得到乙烯脲衍生物,即(Z)-3-氨基-3-(2-氯-6-甲基吡啶-3-基)丙烯酰胺。在第二步中,这些物质在氢化钠存在下与芳基异氰酸酯反应,得到相应的吡啶并[2,3-d]嘧啶-2(1H)-酮衍生物。