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Synthese neuer Thieno [2′,3′; 4,5]imidazo[1,2-a]pyridiniumsalze

✍ Scribed by Prof. Dr. E. Fischer; Prof. Dr. G. Rembarz; Dipl.-Chem. K.-M. Wollin

Book ID
105352140
Publisher
John Wiley and Sons
Year
1980
Tongue
English
Weight
348 KB
Volume
322
Category
Article
ISSN
1615-4150

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✦ Synopsis

Syntheses of New Salts of Thieno[2′,3′;4,5]imidazo[1,2‐a]pyridines

Mesomeric 1‐[2‐amino‐1‐cyano‐2‐thio‐]ethene‐pyridinium ylides 1 are cyclizized to imidazo[1,2‐a]pyridinium ylides 2 in the presence of HgO. S‐alkylation of 2 leads to derivatives of 1‐R^1^‐2‐thio‐3‐cyano‐imidazo[1,2‐a]pyridinium halides 3 or 4. Alkylation products from 2 with α‐haloketones are cyclizized to thieno[2′,3′ 4,5]imidazo[1,2‐a]pyridinium salts 5.

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✍ Jiann-Kuan Luo; Hirotaka Kudo; Ronald F. Federspiel; Raymond N. Castle 📂 Article 📅 1995 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 439 KB