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首页> 外文期刊>Organic & biomolecular chemistry >Reaction cascades initiated by nucleophilic attack of heteropentalene mesomeric betaine and nitrogen-rich mesoionic tetrazolium-5-amides on electron-deficient unsaturated compounds. Synthesis of novel heterocyclic systems
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Reaction cascades initiated by nucleophilic attack of heteropentalene mesomeric betaine and nitrogen-rich mesoionic tetrazolium-5-amides on electron-deficient unsaturated compounds. Synthesis of novel heterocyclic systems

机译：反应级联反应是由杂戊戊烯介观甜菜碱和富氮的中性离子四唑-5-酰胺对缺电子的不饱和化合物的亲核攻击引发的。新型杂环系统的合成

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摘要

The reactions of heteropentalene mesomeric betaine 1 and nitrogen-rich mesoionic tetrazolium-5-amides 4, 11 and 16-18 with electron-deficient unsaturated compounds have been studied. Novel heterocyclic systems, tetrazolo[4,5-a]benzodiazonine inner salt 2 and 3-oxo-3,7-dihydro-2H-pyrazolo[3,4-b]pyridine 5, have been synthesized by the reactions of dimethyl acetylenedicarboxylate with 1 and tetrazolium-5-anilide 4, respectively, and fully characterized by X-ray crystallography. It has been found that the reactions of other tetrazolium-5-amides are also initiated by the nucleophilic addition of the electron-rich amide nitrogen to the electron-deficient unsaturated compounds.
机译：研究了杂戊烯介观的甜菜碱1和富氮的中性离子四唑-5-酰胺4、11和16-18与缺电子的不饱和化合物的反应。通过乙炔基二羧酸二甲酯与三乙氧基二羧酸的反应合成了新型的杂环体系，四唑并[4,5-a]苯并重氮内盐2和3-氧代-3,7-二氢-2H-吡唑并[3,4-b]吡啶5。 1和5-苯甲酰氮四唑分别通过X射线晶体学表征。已经发现，其他的5-氮杂四唑鎓的反应也可以通过富电子的酰胺氮向缺电子的不饱和化合物的亲核加成而引发。

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