Epichlorohydrin → 2-[1-oxiranylmethyl-3-(4-trifluoromethyl-phenyl)-1H-pyrazol-4-yl]-pyrazine

HRID 967411Notes

Reaction equation

HRID 967411 reaction equation
[F:1][C:2]([F:21])([F:20])[C:3]1[CH:8]=[CH:7][C:6]([C:9]2[C:13]([C:14]3[CH:19]=[N:18][CH:17]=[CH:16][N:15]=3)=[CH:12][NH:11][N:10]=2)=[CH:5][CH:4]=1.[CH2:22]([CH:24]1[O:26][CH2:25]1)Cl.C(=O)([O-])[O-].[Cs+].[Cs+]>CN(C=O)C.CCOC(C)=O>[O:26]1[CH2:25][CH:24]1[CH2:22][N:11]1[CH:12]=[C:13]([C:14]2[CH:19]=[N:18][CH:17]=[CH:16][N:15]=2)[C:9]([C:6]2[CH:7]=[CH:8][C:3]([C:2]([F:20])([F:1])[F:21])=[CH:4][CH:5]=2)=[N:10]1

Participants

6

Reactant 3

HCID 7835EpichlorohydrinHCID 10796Cesium carbonateHCID 178506123HCID 178506123, compound

Product 1

HCID 222936232-[1-oxiranylmethyl-3-(4-trifluoromethyl-phenyl)-1H-pyrazol-4-yl]-pyrazineYield 59%

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 8857Ethyl AcetateSolvent

Procedure

To a solution of 2-[3-(4-trifluoromethyl-phenyl)-1H-pyrazol-4-yl]-pyrazine (200 mg, 0.69 mmol) and epichlorohydrin (0.540 mL, 6.9 mmol) in DMF (2 mL) was added cesium carbonate (450 mg, 1.38 mmol). The reaction mixture was allowed to stir for 24 h, diluted with EtOAc, and washed with saturated NaHCO3, water, and brine. The organic layer was dried over Na2SO4, concentrated and purified by column chromatography (silica, 5% acetone/CH2Cl2) to afford 2-[1-oxiranylmethyl-3-(4-trifluoromethyl-phenyl)-1H-pyrazol-4-yl]-pyrazine (141 mg, 59%). TLC (silica, 20% acetone/CH2Cl2): Rf=0.38. MS (electrospray) m/z 347.1 (347.1, calculated for C17H13F3N4O, M++H). 1H NMR (400 MHz, CDCl3): 8.51 (dd, J=2.8, 1.8 Hz, 1H), 8.45 (d, J=1.5 Hz, 1H), 8.38 (d, J=12.8 Hz, 1H), 8.01 (s, 1H), 7.66 (d, J=8.6 Hz, 1H), 7.62 (d, J=8.6 Hz, 1H), 4.57 (dd, J=14.7, 3.1 Hz, 1H), 4.21 (dd, J=14.7, 6.1 Hz, 1H), 3.44 (m, 1H), 2.91 (t, J=4.5 Hz, 1H), 2.62 (dd, J=4.0, 2.5 Hz, 1H).

Workup

  1. washwashed with saturated NaHCO3, water, and brine
  2. dry with materialThe organic layer was dried over Na2SO4
  3. concentrationconcentrated
  4. custompurified by column chromatography (silica, 5% acetone/CH2Cl2)

Sources & evidence

ORD record
ord-ba9d4a7aa5b64d619a2cdcd3cd496d94
Source dataset
uspto-grants-2005_10
Patent number
US06953793B2

Reaction notes

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