Condensed heterocycles with a thiazole ring. 16. Cyanine dyes based on thiazolo[3,4-a]pyridinium salts

✍ Scribed by Yu. P. Kovtun; N. N. Romanov

• Publisher: Springer US
• Year: 1988
• Tongue: English
• Weight: 335 KB
• Volume: 24
• Category: Article
• ISSN: 0009-3122
• DOI: 10.1007/bf00474055

✦ Synopsis

The reaction of 2-(=-chlorobenzyl)pyridines with thioacetamide gave 3-methyll-arylthiazolo [3,4-a]pyridinium salts, which form cyanines. It was established that the thiazolopyridinium ring in the dyes has high electron-donor character and a great effective length.

Quaternary salts of 2-methylthiazoles are widely used in the synthesis of polymethine dyes [2]. Condensed heterocyclic systems with a nodal nitrogen atom that contain a thiazole ring have also recently attracted the attention of researchers [3]. Thiazolo[3,4-~]pyridine derivatives undoubtedly occupy a special place among the simplest compounds of this type; however, only individual representatives of this class have been described [4,5].