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2-Benzopyrylium salts. 34. Reactions of 3-carboxy-2-benzopyrylium salts with amines. Synthesis of cyclic ketols

✍ Scribed by Yu. A. Zhdanov; V. G. Brovchenko; M. A. Klyuev; E. V. Kuznetsov

Publisher: Springer US
Year: 1989
Tongue: English
Weight: 510 KB
Volume: 25
Category: Article
ISSN: 0009-3122
DOI: 10.1007/bf00480747

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✦ Synopsis

3-Carboxy-2-benzopyrylium salts form 3-carboxyisoquinolinium salts, their decarboxylated analogs, or products of contraction of the heterocycle, namely, cyclic ketols, depending on the nature of the amine and solvent. Upon treatment with acids, these ketols are demethylated through the intermediate formation of ~-acylcarbenium ions and are converted to quinonemethides.

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