Cesium carbonate → 6-Fluoro-1-[2-(tetrahydro-pyran-2-yloxy)-ethyl]-1H-indazole
Reaction equation
[F:1][C:2]1[CH:10]=[C:9]2[C:5]([CH:6]=[N:7][NH:8]2)=[CH:4][CH:3]=1.Br[CH2:12][CH2:13][O:14][CH:15]1[CH2:20][CH2:19][CH2:18][CH2:17][O:16]1.C(=O)([O-])[O-].[Cs+].[Cs+]>CN(C=O)C>[F:1][C:2]1[CH:10]=[C:9]2[C:5]([CH:6]=[N:7][N:8]2[CH2:12][CH2:13][O:14][CH:15]2[CH2:20][CH2:19][CH2:18][CH2:17][O:16]2)=[CH:4][CH:3]=1Participants
Procedure
A mixture of 6-fluoro-1H-indazole (2.0 g, 14.7 mmol), and 2-(2-bromo-ethoxy)-tetrahydro-pyran (3.38 g, 16.2 mmol) in DMF (25 mL) was treated with caesium carbonate (6.1 g, 18.7 mmol) and stirred at RT for 18 h. The solvent volume was reduced in vacuo, and the residue partitioned between EtOAc (100 mL) and water (100 mL). The aqueous layer was extracted into EtOAc (3×). The combined organic layers were washed with saturated aqueous sodium chloride solution, dried (MgSO4) and evaporated in vacuo. The residue was purified by FCC, using 0-50% cyclohexane in EtOAc, to afford the title product and a yellow oil. LCMS (Method 1): Rt 3.42 min, m/z 181 [MH+] (M-THP). 1H NMR (300 MHz; CDCl3) 1.52-1.56 (6 H, m), 3.39-3.49 (1 H, m), 3.57-3.68 (1 H, m), 3.89-3.91 (1 H, m), 4.19-4.21 (1 H, m), 4.56-4.57 (3 H, m), 6.88 (1 H, td, J 9.15 and 2.26), 7.30 (1 H, m), 7.62 (1 H, m), 8.04 (1 H, s).
Workup
- customthe residue partitioned between EtOAc (100 mL) and water (100 mL)
- extractionThe aqueous layer was extracted into EtOAc (3×)
- washThe combined organic layers were washed with saturated aqueous sodium chloride solution
- dry with materialdried (MgSO4)
- customevaporated in vacuo
- customThe residue was purified by FCC
Sources & evidence
- ORD record
- ord-74fa5f09b68443bda018b8dcabf0679c
- Source dataset
- uspto-grants-2015_09
- Patent number
- US09145413B2
Reaction notes
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