Sodium hydride → 1-(3-benzyloxy-2,2-difluoropropyl)-4-iodo-1H-pyrazole

HRID 2279882Notes

Reaction equation

HRID 2279882 reaction equation
[I:1][C:2]1[CH:3]=[N:4][NH:5][CH:6]=1.[H-].[Na+].[CH2:9]([O:16][CH2:17][C:18]([F:26])([F:25])[CH2:19]OS(C)(=O)=O)[C:10]1[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=1.[Cl-].[NH4+]>CN(C=O)C>[CH2:9]([O:16][CH2:17][C:18]([F:25])([F:26])[CH2:19][N:4]1[CH:3]=[C:2]([I:1])[CH:6]=[N:5]1)[C:10]1[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=1

Participants

6

Reactant 4

HCID 24758Sodium hydrideHCID 25517Ammonium ChlorideHCID 770224-IodopyrazoleHCID 86697820Methanesulfonic acid 3-benzyloxy-2,2-difluoropropyl ester2×

Product 1

HCID 678137681-(3-benzyloxy-2,2-difluoropropyl)-4-iodo-1H-pyrazoleYield 73.6%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

A cold (0° C.) solution of 4-iodo-1H-pyrazole (10.1 g, 51.8 mmol) in DMF (20 mL) was treated with NaH (1.56 g, 38.82 mmol, 60%) and allowed to warm to RT. After 1 h, the reaction mixture was treated with methanesulfonic acid 3-benzyloxy-2,2-difluoropropyl ester (Compound 59G, 2.0 g, 6.47 mmol) and was stirred for 24 h at 70° C. The reaction mixture was poured into chilled sat. aq. ammonium chloride (20 mL) and extracted with ethyl acetate (100 mL). The organic layer was washed with water (5×30 mL), dried over Na2SO4, filtered, concentrated and purified by column chromatography (SiO2, 30% ethyl acetate/hexanes) to give 1.8 g (72%) of the title compound as a white solid. 1H NMR (500 MHz, CDCl3) δ 7.32-7.38 (m, 7H), 4.63 (s, 2H), 3.89 (s, J=12.5 Hz, 2H), 3.77 (t, J=12.5 Hz, 2H).

Workup

  1. additionThe reaction mixture was poured
  2. extractionextracted with ethyl acetate (100 mL)
  3. washThe organic layer was washed with water (5×30 mL)
  4. dry with materialdried over Na2SO4
  5. filtrationfiltered
  6. concentrationconcentrated
  7. custompurified by column chromatography (SiO2, 30% ethyl acetate/hexanes)

Sources & evidence

ORD record
ord-9d87f66b0ef14b3eb8b1d45e42baf156
Source dataset
uspto-grants-2015_09
Patent number
US09133224B2

Reaction notes

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