Ethyl Acetate → 1-[3-(4-Chloro-2-methyl-2H-pyrazol-3-yl)4-hydroxy-phenyl]-3-(2,4-difluoro-phenyl)-urea

HRID 1362937Notes

Reaction equation

HRID 1362937 reaction equation
[Cl:1][C:2]1[CH:6]=[N:5][N:4]([CH3:7])[C:3]=1[C:8]1[CH:9]=[C:10]([NH:16][C:17]([NH:19][C:20]2[CH:25]=[CH:24][C:23]([F:26])=[CH:22][C:21]=2[F:27])=[O:18])[CH:11]=[CH:12][C:13]=1[O:14]C.[Cl-].[Al+3].[Cl-].[Cl-].C(OCC)(=O)C>ClCCCl>[Cl:1][C:2]1[CH:6]=[N:5][N:4]([CH3:7])[C:3]=1[C:8]1[CH:9]=[C:10]([NH:16][C:17]([NH:19][C:20]2[CH:25]=[CH:24][C:23]([F:26])=[CH:22][C:21]=2[F:27])=[O:18])[CH:11]=[CH:12][C:13]=1[OH:14]

Participants

5

Reactant 3

HCID 8857Ethyl AcetateHCID 6451240Aluminum(III) ChlorideHCID 116755501-[3-(4-Chloro-2-methyl-2H-pyrazol-3-yl)-4-methoxy-phenyl]-3-(2,4-difluoro-phenyl)urea

Product 1

HCID 1356979371-[3-(4-Chloro-2-methyl-2H-pyrazol-3-yl)4-hydroxy-phenyl]-3-(2,4-difluoro-phenyl)-ureaYield 75%

Reagents, catalysts & solvents 1

HCID 111,2-DichloroethaneSolvent

Conditions

Temperature
0 °C

Procedure

A mixture of 1-[3-(4-chloro-2-methyl-2H-pyrazol-3-yl)-4-methoxy-phenyl]-3-(2,4-difluoro-phenyl)urea (0.270 g, 0.69 mmol) in anhydrous 1,2-dichloroethane (10 mL) was cooled to 0° C. in an ice bath and stirred for 10 minutes. Anhydrous aluminum chloride (0.368 g, 2.76 mmol) was added and the reaction mixture stirred at 0° C. for 20 minutes, then moved to an oil bath and stirred at 80° C. for 1 hour. Ethyl acetate was added and washed with potassium sodium tartrate (10%) twice. The organic layer was separated, dried over anhydrous Na2SO4, filtered and concentrated to give a crude product that was subjected to purification on HPLC. The proper fractions were collected and lyophilized to afford 1-[3-(4-chloro-2-methyl-2H-pyrazol-3-yl)-4-hydroxy-phenyl]-3-(2,4-difluoro-phenyl)-urea as a white solid in 75.0% yield. LCMS m/z (%)=379 (M+H 35Cl, 100), 381 (M+H 37Cl, 40). 1H NMR (400 MHz, DMSO-d6) δ 9.81 (s, 1H), 8.92 (s, 1H), 8.45 (s, 1H), 8.12-8.06 (m, 1H), 7.63 (s, 1H), 7.40-7.31 (m, 3H), 7.09-7.04 (m, 1H), 6.99 (d, J1=8.72 Hz, 1H), 3.69 (s, 3H).

Workup

  1. stirringthe reaction mixture stirred at 0° C. for 20 minutes
  2. custommoved to an oil bath
  3. stirringstirred at 80° C. for 1 hour
  4. washwashed with potassium sodium tartrate (10%) twice
  5. customThe organic layer was separated
  6. dry with materialdried over anhydrous Na2SO4
  7. filtrationfiltered
  8. concentrationconcentrated
  9. customto give a crude product that
  10. customwas subjected to purification on HPLC
  11. customThe proper fractions were collected

Sources & evidence

ORD record
ord-dac363906fe543b8ae169de79d3555bb
Source dataset
uspto-grants-2011_02
Patent number
US07884101B2

Reaction notes

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