Polycyclic N-hetero compounds. XIX. Synthesis of novel meso-ionic benz[h]imidazo[1,2-c]quinazoline and benzo[h]pyrrolo[1′,2′:3,4]imidazo[1,2-c]quinazoline derivatives
TL;DR: In this article, meso-ionic ring systems were synthesized by the reaction of N-(5,6-dihydrobenzo[h]-quinazolin-4-yl)amino acids with acetic anhydride.
About: This article is published in Journal of Heterocyclic Chemistry.The article was published on 1985-01-01. It has received 6 citations till now. The article focuses on the topics: Quinazoline & Acetic anhydride.
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TL;DR: In this paper, the synthesis of 11-substituted 1,2,4,5,tetrahydrobenzo[h]imidazo[1,2-c]quinazolines corresponding to 12-substantituted 11,13,15-triazasteroid is described.
15 citations
TL;DR: In this article, a triazasteroidal skeleton with an alkyl group in the D-ring was synthesized and it was screened for antidepressive activity and showed antireserpine action.
15 citations
TL;DR: In this article, a study of the cyclization method by heating of N-(6,7-dihydro-5H-pyrimido[5,4-d][1]benzazepin-4-yl)amino acids 3a-h, 6, and 9a,b with excess acetic anhydride for the preparation of 2-substituted 1-acetoxy-6-acetyl-5,6-dimethyl-4H-imidazo[1,2′:1,6]p
13 citations
TL;DR: In this article, 2-anilinopyridine with chloroacetyl chloride in the presence of N,N-dimethylacetamide resulted in the formation of the mesoion imidazo[1,2-a]pyridinium-3-olate instead of the reported 4-oxopyrimidine-5-olate.
4 citations
01 Jan 2022
TL;DR: In this paper , the chemistry of type A mesoionic rings has been reviewed and a review of all the known type A ring systems that has been published since 1980 is presented.
Abstract: Type A mesoionic compounds are of particular interest due to their participation in synthetically useful 1,3-dipolar cycloaddition reactions. This review covers the chemistry of type A mesoionic rings published in the period 1980–2020 together with some work published in the first half of 2021. Type A mesoionic rings are conjugated heterocyclic mesomeric betaines (HMBs). Their relationship to other heterocyclic HMBs, including cross-conjugated HMBs, semi-conjugated HMBs and type B mesoionic rings, is discussed together with general aspects of their structure and properties. This is followed by a discussion of the chemistry of all the known type A ring systems that has been published since 1980.
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