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New heterocycles with cycloamidine substructure and their ringtransformation reactions with acetylene dicarboxylic ester

✍ Scribed by Thomas Billot; Rainer Beckert; Manfred Döring; Jörg Wuckelt; Peer Fehling; Helmar Görls

Publisher
Journal of Heterocyclic Chemistry
Year
2001
Tongue
English
Weight
101 KB
Volume
38
Category
Article
ISSN
0022-152X

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✦ Synopsis

Abstract

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 of the acetylene subunit takes place. Starting from compound 6a, the pyrrolo[2,3‐d]imidazole 11a could be isolated from a mixture of unidentified by‐products, whereas derivatives 7 gave nearly quantitatively the tricyclic products of type 12.

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## Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable v