Convenient Way to the Synthesis of Polycyclic Fused Benzimidazole Derivatives with a Bridgehead Nitrogen Atom
作者:R. S. Begunov、A. A. Sokolov、D. A. Gromova
DOI:10.1134/s1070428018050123
日期:2018.5
Effective synthesis was developed for 1,2,3,4-tetrahydropyrido- and pyrido[1,2-a]benzimidazole-7,8-diamines that underlie the preparation of new polyazaheterocycles: pyrido[1,2-а]imidazo[4,5-f]-benzimidazole, 7Н-pyrido[1,2-а]imidazo[4,5-f]benzotriazole, pyrido[1,2-а]imidazo[4,5-g]quinoxaline.
已开发了有效的合成方法,用于1,2,3,4-四氢吡啶基和吡啶并[1,2 - a ]苯并咪唑-7,8-二胺,这些化合物是制备新的多氮杂环的基础:吡啶并[1,2- а ]咪唑[4] ,5- ˚F ] -苯并咪唑,7- Н -吡啶并[1,2- а ]咪唑并[4,5- ˚F ]苯并三唑,吡啶并[1,2 а ]咪唑并[4,5-克]喹喔啉。
Hypervalent iodine(<scp>iii</scp>) catalyzed oxidative C–N bond formation in water: synthesis of benzimidazole-fused heterocycles
作者:D. Nageswar Rao、Sk. Rasheed、Ram A. Vishwakarma、Parthasarathi Das
DOI:10.1039/c4ra02279c
日期:——
A diverse array of benzimidazole-fused heterocycles was synthesized by in situ generated hypervalent iodine(iii) catalyzed intramolecular oxidative C–N bond formation in water and under ambient conditions.
Reaction of substituted pyrido[1,2-a]benzimidazoles with electrophilic agents
作者:Roman S. Begunov、Alexandr A. Sokolov、Valeria O. Belova、Artem N. Fakhrutdinov、Alexander S. Shashkov、Ivan V. Fedyanin
DOI:10.1016/j.tetlet.2015.08.014
日期:2015.10
reactivity of substitutedpyrido[1,2-a]benzimidazoles toward electrophilic aromatic substitution has been studied. An unusual introduction of an electrophilic species at the ortho position with respect to an electron-withdrawing group was found, and investigated. Changing the substituent nature from a meta director to an ortho/para director did not alter the selectivity of electrophilicsubstitution. Assignment
已经研究了取代的吡啶并[1,2- a ]苯并咪唑对亲电子芳族取代的反应性。发现并研究了相对于吸电子基团在邻位不寻常地引入亲电子物质。将取代基的性质从间位元键更改为邻位/对位键不会改变亲电取代基的选择性。质子和碳光谱S的产品的分配ë氩反应进行了使用一维和二维NMR和选定的硝基-和dinitropyrido的结构[1,2一]苯并咪唑通过单晶X-射线衍射证实。
Cleavage of 7- and 8-nitropyrido[1,2-a]benzimidazoles on treatment with dimethyl acetylenedicarboxylate
作者:Alexey V. Varlamov、Elena A. Savitkina、Anatoly P. Krapivko、Alexey I. Chernyshev、Alexander N. Levov
DOI:10.1070/mc2005v015n03abeh001955
日期:2005.1
7-Nitropyrido[1,2-a]benzimidazole and 8-nitropyrido[1,2-a]benzimidazole undergo cleavage-recyclization under the action of an excess of dimethyl acetylenedicarboxylate.
Synthesis of Quinone Derivatives of Benzannelated Heterocycles with Bridgehead Nitrogen
作者:R. S. Begunov、A. A. Sokolov、S. I. Filimonov
DOI:10.1134/s1070428020080084
日期:2020.8
A facile synthesis ofpara-quinones derived from fused benzimidazoles with a bridgehead nitrogen atom was developed. The heterocyclic quinone core formed as a result of reductive cyclization ofortho-nitroarenes containing alicyclic and aromatic azaheterocycles. Functionalization of 1,2,3,4-tetrahydro- and pyrido[1,2-a]benzimidazoles viaS(E)Ar, condensation, and reduction reactions allowed synthesis of amino derivatives which were oxidized with KNO(3)in H(2)SO(4)to obtain novel heterocyclic quinones.