Abstract:Efficient Synthesis of 4-Phosphinoyl-4,5,6,7-tetrahydro-2H-indazol-3-ylamines.-The title compounds are prepared in a three-step sequence which involves nucleophilic addition of hydrazines to β-ketothiamides as the key step. The application of this strategy to the preparation of simple pyrazoles fails: instead, cleavage of the carbonyl moieties occurs to give phosphinylthioamides (XIV). -(JELAIEL, N.; COMOY, C.; FERNETTE, B.; EFRIT, M. L.; FORT*, Y.; Tetrahedron 67 (2011) 48, 9440-9445, http://dx.
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