Applications of a novel carbon-nitrogen bond cleavage reaction (part I). A new synthesis / derivatisation of 5H-indeno[1,2d] pyrimidines and pyrimido[6,1-a]isoindoles.
作者:Bansi Lal、Ramesh M. Gidwani
DOI:10.1016/s0040-4020(01)80524-x
日期:1993.1
presence of a mixture of formic acid and orthophosphoric acid, to give 5H-indeno[1,2-]pyrimidines () and/or pyrimido[6,1-]isoindoles (). Cyclization to and/or depends on the nature of substitution in the pyrimidine ring in . Electron withdrawing groups at position 4 in favour the formation of the skeleton , however, electron donating groups gave more of . Compound on acid treatment, gave in addition to , a
取代的6-(4,5-二甲氧基-2-乙烯基苯基)-2,4-(1H,3H)嘧啶二酮在甲酸和正磷酸的混合物存在下进行闭环反应,得到5H-茚并[1] ,2- ]嘧啶()和/或嘧啶[6,1- ]异吲哚()。环化至和/或取决于环化嘧啶环中的取代性质。在位置4的吸电子基团有利于骨架的形成,但是,给电子基团提供了更多的。经酸处理的化合物,除此以外,还得到二聚产物。氯氧化磷化合物处理后生成2,4-二氯化合物。两个氯基团的化学反应性不同。当与胺在苯中反应时,通常2-位区域异构体占主导地位,但在戊醇中会形成2,4-二取代的氨基化合物。