[Br:1][C:2]1[C:3]([O:17][C:18]2[CH:23]=[CH:22][C:21]([N+:24]([O-:26])=[O:25])=[CH:20][C:19]=2[F:27])=[CH:4][C:5]2[C:9]([CH:10]=1)=[N:8][N:7](C1CCCCO1)[CH:6]=2.CO.CS(O)(=O)=O.[OH-].[Na+]>C(Cl)Cl.O>[Br:1][C:2]1[CH:10]=[C:9]2[C:5]([CH:6]=[N:7][NH:8]2)=[CH:4][C:3]=1[O:17][C:18]1[CH:23]=[CH:22][C:21]([N+:24]([O-:26])=[O:25])=[CH:20][C:19]=1[F:27]
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).
Wird geladen…
