Synthesis of fluorescent heterocycles via a Knoevenagel/[4 + 1]-cycloaddition cascade using acetyl cyanide
作者:Guillermo Martinez-Ariza、Bereketab T. Mehari、Ludmila A. G. Pinho、Christopher Foley、Kendall Day、John C. Jewett、Christopher Hulme
DOI:10.1039/c7ob01239j
日期:——
A concise one-pot three-component reaction that affords fluorescent indolizines, benzo[d]pyrrolo[2,1-b]thiazoles, and pyrrolo[1,2-a]pyrazines is reported. The methodology involves the formation of a heterocyclic 1-aza-1,3-diene derived from a Knoevenagel condensation between an aldehyde and 2-methyl-ene-cyano aza-heterocycles, followed by [4 + 1] cycloaddition of acetyl cyanide behaving as a non-classical
报道了一种简明的一锅三组分反应,该反应提供了荧光吲哚嗪,苯并[ d ]吡咯并[2,1- b ]噻唑和吡咯并[1,2- a ]吡嗪。该方法包括从醛与2-甲基-氰基-氮杂-杂环之间的Knoevenagel缩合形成杂环的1-氮杂-1,3-二烯,然后[4 +1]环合乙酰化氰化物,其反应如下:非经典的异氰化物替代品。