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.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2653199 | PMC |
| http://dx.doi.org/10.1021/jo8018895 | DOI Listing |
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