Heterotricyclic systems. Part<b>I</b>. Synthesis of new dipyridopyrazines
作者:Francesco Savelli、Alessandro Boido
DOI:10.1002/jhet.5570290241
日期:1992.3
cyclization of N-(3′-nitropyridin-2′-yl)piperidine-2-carboxylic acids 3a-c, a set of derivatives of a new tricyclic structure, 7,8,9,10-tetrahydro-5H-dipyrido[1,2-a:3′,2′-e]pyrazin-6(6aH)-ones 4a-c. Starting from these compounds we obtained substituted amides 5a-c and, from 4a, the amidines 6a-c. In the synthesis of 6, a dehydrogenation reaction occurred giving rise to 7. The compounds 9 and 10, characterized
根据先前对氮杂喹喔啉酮(1,2-二氢吡啶并[2,3- b ] / [3,4- b ]吡嗪酮)的研究,我们通过对N-(3'-硝基吡啶-2'-yl)的还原环化反应制备了哌啶-2-羧酸3a-c是一组新的三环结构的衍生物7,8,9,10-四氢-5 H-二吡啶并[1,2- a:3',2'-e]吡嗪-6(6a H)-one 4a-c。从这些化合物开始,我们获得了取代的酰胺5a-c,并从4a获得了66a -c。在6的合成中,发生脱氢反应,从而产生7。以相似的方式合成了以吡啶和吡嗪环之间不同的环稠合为特征的化合物9和10。