Rearrangement of 2-ethynylpyridinium N-imides to pyrazolo [2, 3-a] pyridines

T Tsuchiya, H Sashida

Index: Tsuchiya, Takashi; Sashida, Haruki Journal of the Chemical Society, Chemical Communications, 1980 , # 23 p. 1109 - 1110

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Abstract

By TAKASHI TSUCHIYA* and HARUKI SASHIDA (School of Pharmacy, Hokuriku University, Kanagawa-machi, Kanazawa, 920-1 1, Japan) ... Summary Pyrazolo[2,3-a]pyridines (6) are obtained from the N-amino-2-ethynylpyridinium salts (5) on treatment with base. ... THE l13-dipolar cycloadditionl of the pyridinium N-imides (1) to olefins or acetylenes and the intramolecular 1,5- dipolar cyclisation2 of the vinylazomethine imides (2) have been widely investigated. ...

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