Acetylenyl-N-methylpyrazolecarboxylic acids containing an acetylenic substituent and a carboxyl group on adjacent carbon atoms cyclize in pyridine in the presence of copper phenylacetylenide to pyranopyrazoles. The same compounds are obtained by the acetylenide cyclocondensation of the appropriate iodopyrazolecarboxylic acids, but at a much lower rate.
|Number of pages||6|
|Journal||Bulletin of the Academy of Sciences of the USSR Division of Chemical Science|
|Publication status||Published - 1 Jun 1981|
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