Pyrazolopyridines. Part II. Preparation of 3-substituted 2-aryl-2H-pyrazolo[4,3-b]pyridines. Acid-catalysed cyclisation of 2-arylaminomethyl-3-nitropyridines

doi:10.1039/P19730000319

Paper

Pyrazolopyridines. Part II. Preparation of 3-substituted 2-aryl-2H-pyrazolo[4,3-b]pyridines. Acid-catalysed cyclisation of 2-arylaminomethyl-3-nitropyridines

Published 1973 · H. Foster, J. Hurst

Journal of The Chemical Society-perkin Transactions 1

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11

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Abstract

The reactions of 2-arylaminomethyl-3-nitropyridines with primary aromatic amines, hydrogen chloride, and ethanol gave 3-arylamino-, 3-chloro-, and 3-ethoxy-2-arylpyrazolo[4,3-b]pyridines, respectively. Cyciisation of 2-arylaminomethyl-3-nitropyridines in acetic acid yielded 2-arylpyrazolo[4,3-b]pyridin-3(2H)-ones. Mechanisms for the formation of these compounds are suggested.

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This study demonstrates the preparation of 3-substituted 2-aryl-2H-pyrazolo[4,3-b]pyridines by acid-catalyzed cyclisation of 2-arylaminomethyl-3-nitropyridines, yielding 3-arylamino-, 3-chloro

PopulationOlder adults (50-71 years)

Sample size24

MethodsObservational

OutcomesBody Mass Index projections

ResultsSocial networks mitigate obesity in older groups.

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Pyrazolopyridines. Part II. Preparation of 3-substituted 2-aryl-2H-pyrazolo[4,3-b]pyridines. Acid-catalysed cyclisation of 2-arylaminomethyl-3-nitropyridines

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