New heterocycles with cycloamidine substructure and their ringtransformation reactions with acetylene dicarboxylic ester
作者:Thomas Billot、Rainer Beckert、Manfred Döring、Jörg Wuckelt、Peer Fehling、Helmar Görls
DOI:10.1002/jhet.5570380131
日期:2001.1
The synthesis of pyrido[2,1-c]-1,2,4-triazines 6, pyrido[1,2-b]-1,2,4-triazines 7 and pyrido[1,2-b]pyri-dazines 8 respectively by cycloacylation of derivatives of pyridine with imidoylchlorides of type 2 is described. The heterocycles of type 6 as well as of type 7 can be ring-transformed with dimethyl acetylenedicarboxylate. In contrast to pyrido[1,2-a]pyrazines 1, a complex reaction including cleavage
吡啶并[2,1 - c ] -1,2,4-三嗪6,吡啶并[1,2 - b ] -1,2,4-三嗪7和吡啶并[1,2 - b ]吡啶并嗪的合成描述了分别通过吡啶衍生物与2型亚氨基氯化物的环酰化反应的图8。类型6以及类型7的杂环可以用乙炔基二羧酸二甲酯环转化。与吡啶并[1,2- a ]吡嗪1相反,发生包括乙炔亚基裂解的复杂反应。从化合物6a开始,吡咯并[2,3- d]咪唑11a可以从未知副产物的混合物中分离出来,而衍生物7几乎定量地给出了12型三环产物。