Sodium Sulfite → HCID 178518956, compound

Participants

Reaction Conditions

Reaction Steps

To a mixture of 3-bromo-2-carboxyaniline (6.6 g, 30.6 mmol, see Aust. J. Chem., 1999, 52, 1061) in H2O (28 ml) and HCl (conc., 6 ml) was added a solution of NaNO2 (2.11 g, 30 mmol) in H2O (5 ml) at 0° C. The mixture was stirred at 0° C. for 30 minutes then a solution of Na2SO3 (10.4 g, 82.5 mmol) in H2O (28 ml) was added slowly. The mixture was stirred at room temperature for 2 hours and HCl (conc., 9 ml) was slowly added. The resulting mixture was stirred at room temperature for additional 18 hours, then at 80° C. for 4 hours, and finally cooled to room temperature. The reaction mixture was basified to dissolve the precipitate and then reacidified. The precipitated 4-Bromo-1H-indazol-3-ol CLXXXIII was filtered and dried in vacuo (yellow powder, 3.19 g, 49% yield).

Provenance & Evidence