Reaction of C-alkylated heterocyclic ketene aminals with diethyl azodicarboxylate: synthesis of polyfunctionalized quaternary carbon derivatives and their thermal fragmentation
Five-membered ring C-alkylated heterocyclic ketene aminals react with diethylazodicarboxylate to give the quaternary carbon-containing adducts in moderate to excellent yields while the six-membered analogs afford imidazo[1,5-a]pyrimidin-6-one derivatives. The formation of the addition products and their fragmentation reaction pathways are discussed.
五元环C-烷基化的杂环烯酮缩醛与偶氮二羧酸二乙酯反应,以中等至优异的收率得到含季碳的加合物,而六元类似物提供了咪唑并[1,5 - a ]嘧啶-6-一衍生物。讨论了加成产物的形成及其片段化反应途径。