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Reactions with 3,6-diaminothieno[2,3-b]-pyridines: Synthesis and characterization of several new fused pyridine heterocycles

✍ Scribed by Mohamed A. M. Gad-Elkareem; Mohamed A. A. Elneairy; Adel M. Taha

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
255 KB
Volume
18
Category
Article
ISSN
1042-7163

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✦ Synopsis

Abstract

6‐Aminopyridine‐2(1H)thiones 1 reacting with α‐halo‐compounds 2a–c afforded the alkylthiopyridine derivatives 3a–c which in turn cyclized to the corresponding thieno[2,3‐b]pyridine derivatives 4a–c. Several thieno[2,3‐b]pyridine derivatives 7, 16, 19, pyrido[3′,2′:4,5]thieno[3,2‐d]pyrimidine derivatives 6a,b, 11a–c, 21 and pyrido[3′,2′:4,5]thieno[3,2‐c]pyridazine derivatives 13, 17 were prepared starting from compounds 4a–c. © 2007 Wiley Periodicals, Inc. Heteroatom Chem 18:405–413, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.20313

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Reactions with dimethylformamide-dimethy
Reactions with dimethylformamide-dimethylacetal: Synthesis and reactions of several new pyridine and pyrazolo[3,4-b]pyridine derivatives
✍ Mohamed A. A. Elneairy; Mohamed A. M. Gad-Elkareem; Adel M. Taha 📂 Article 📅 2007 🏛 John Wiley and Sons 🌐 English ⚖ 177 KB

## Abstract 6‐Aminopyridine‐2(1H)‐thiones **1a,b** reacted with dimethylformamide‐dimethylacetal (DMF‐DMA) to give the corresponding 6‐{[(N,N‐dimethylamino)methylene]amino}pyridine derivatives **2a,b**. The latter compounds reacted with hydrazine hydrate to afford the 3,6‐diamino‐1H‐pyrazolo[3,4‐b]