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Synthesis of pyrazolo[1,5-a]pyridines

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The synthesis of functionalized pyrazolo[1,5-a]pyridines through oxidative [3+2] cycloaddition of N-aminopyridines with α,β-unsaturated carbonyl compounds or electron-withdrawing olefins proceeds in N-methylpyrrolidone as the solvent under metal-free conditions at room temperature.
C. Ravi, S. Samanta, D. C. Mohan, N. N. K. Reddy, S. Adimurthy, Synthesis, 2017, 49, 2513-2522.