S. V. Alieva, A. Vorob’ev
Jul 1, 2020
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Chemistry of Heterocyclic Compounds
Abstract
The reaction of methyl esters of pyrazolo[1,5- a ]pyridine-2,3-dicarboxylic and 2-phenylpyrazolo[1,5- a ]pyridine-3-carboxylic acids with the fluorinating reagent Selectfluor gave 3-fluoropyrazolo[1,5- a ]pyridine-2-carboxylic acid methyl ester and 3-fluoro-2-phenylpyrazolo- [1,5- a ]pyridine. Monitoring the progress of the reaction by 1 H NMR spectroscopy showed the formation of an intermediate fluorinecontaining σ-complex.