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Base-catalyzed tandem carbon-carbon followed by nitrogen-nitrogen bond formations quantitatively converted N-alkyl-2-nitro-N-(2-oxo-2-aryl-ethyl)-benzenesulfonamides to 2H-indazoles 1-oxides under mild conditions. Triphenylphosphine or mesyl chloride/triethylamine-mediated deoxygenation afforded 2H-indazoles.

journal of organic chemistry

Remarkably Efficient Synthesis of 2<i>H</i>-Indazole 1-Oxides and 2<i>H</i>-Indazoles via Tandem Carbon−Carbon Followed by Nitrogen−Nitrogen Bond Formation

Remarkably Efficient Synthesis of 2H-Indazole 1-Oxides and 2H-Indazoles via Tandem Carbon−Carbon Followed by Nitrogen−Nitrogen Bond Formation