Methanol → 6-bromo-5-(2-fluoro-4-nitrophenoxy)-1H-indazole

Participants

Reaction Conditions

Reaction Steps

To a 3000 mL flask is added 6-bromo-5-(2-fluoro-4-nitrophenoxy)-2-(tetrahydro-2H-pyran-2-yl)-2H-indazole (250 g, 573.1 mmol) followed by MeOH (1000 mL) and MeSO3H (1 12.71 mL,1.72 mol) and heated to 50° C. for 14 hours. Solid crystallizes out of solution. The mixture is then cooled to RT. The reaction mixture is concentrated under vacuum at 45° C. to dryness to get solid. The solid is diluted with DCM (2000 mL) and treated with water (1000 mL) and 5N NaOH (about 350 mL) until the pH is 8-9. The organic layer is separated and the solvent is removed followed by azeotrope with toluene to give 195.6 g of the yellow solid material. MS (m/z): 354.0 (M+H).

Provenance & Evidence