Synthesis of quinolizin-2-one and pyrido[1,2-a]azepin-2-one derivatives from difluoroboron complexes of aroylacetones and O-methyllactims
作者:I. V. Kravtsov、S. V. Baranin、P. A. Belyakov、V. A. Dorokhov
DOI:10.1007/s11172-011-0308-3
日期:2011.10
O-Methyllactims react at the methyl group of difluoroboron complexes of aroylacetones with the formation of condensation products, novel difluoroboron chelates of 1-aryl-4-(piperi-din-2-ylidene)butane-1,3-diones and 1-aryl-4-(azepan-2-ylidene)butane-1,3-diones, which upon the action of concentrated HCl in ethanol are transformed into the corresponding quino-lizin-2-one and pyrido[1,2-a]azepin-2-one derivatives.
O-甲基内酯与芳酰丙酮二氟硼配合物的甲基发生反应,形成缩合产物,即 1-芳基-4-(哌啶-2-亚基)丁烷-1,3-二酮和 1-芳基的新型二氟硼螯合物-4-(azepan-2-ylidene)butane-1,3-diones,在浓盐酸乙醇溶液的作用下转化为相应的 quino-lizin-2-one 和吡啶并[1,2-a]azepin- 2-1衍生物。