2-Bromoethanol → (RS)-1-{2-[5,6-difluoro-1-(2-hydroxy-ethyl)-1H-benzoimidazol-2-ylmethyl]-piperidin-1-yl}-1-[5-(4-fluoro-phenyl)-2-methyl-thiazol-4-yl]-methanone

HRID 2077424Notes

Reaction equation

HRID 2077424 reaction equation
[F:1][C:2]1[C:32]([F:33])=[CH:31][C:5]2[NH:6][C:7]([CH2:9][CH:10]3[CH2:15][CH2:14][CH2:13][CH2:12][N:11]3[C:16]([C:18]3[N:19]=[C:20]([CH3:30])[S:21][C:22]=3[C:23]3[CH:28]=[CH:27][C:26]([F:29])=[CH:25][CH:24]=3)=[O:17])=[N:8][C:4]=2[CH:3]=1.[H-].[Na+].Br[CH2:37][CH2:38][OH:39].C(=O)([O-])[O-].[K+].[K+].C(N(CC)C(C)C)(C)C>CN(C=O)C>[F:1][C:2]1[C:32]([F:33])=[CH:31][C:5]2[N:6]([CH2:37][CH2:38][OH:39])[C:7]([CH2:9][CH:10]3[CH2:15][CH2:14][CH2:13][CH2:12][N:11]3[C:16]([C:18]3[N:19]=[C:20]([CH3:30])[S:21][C:22]=3[C:23]3[CH:28]=[CH:27][C:26]([F:29])=[CH:25][CH:24]=3)=[O:17])=[N:8][C:4]=2[CH:3]=1

Participants

7

Reactant 5

HCID 108982-Bromoethanol2×HCID 11430Potassium CarbonateHCID 24758Sodium hydrideHCID 81531DiisopropylethylamineHCID 17973672(RS)-1-[2-(5,6-Difluoro-1H-benzoimidazol-2-ylmethyl)-piperidin-1-yl]-1-[5-(4-fluoro-phenyl)-2-methyl-thiazol-4-yl]-methanone

Product 1

HCID 17973689(RS)-1-{2-[5,6-difluoro-1-(2-hydroxy-ethyl)-1H-benzoimidazol-2-ylmethyl]-piperidin-1-yl}-1-[5-(4-fluoro-phenyl)-2-methyl-thiazol-4-yl]-methanoneYield 29%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Conditions

Temperature
110 °C

Procedure

(RS)-1-[2-(5,6-Difluoro-1H-benzoimidazol-2-ylmethyl)-piperidin-1-yl]-1-[5-(4-fluoro-phenyl)-2-methyl-thiazol-4-yl]-methanone, E35 (250 mg, 0.53 mmol) was added slowly to an ice-cooled slurry of sodium hydride (43 mg, 1.1 mmol, 60% dispersion in mineral oil) in DMF (10 ml), under argon. After stirring for a further 0.5 h, 2-bromoethanol (0.045 ml, 0.64 mmol) was added. The mixture was heated at 110° C. for 48 h, but only a minor amount of product had formed (MS). Potassium carbonate (1.00 g), N,N-diisopropylethylamine (1.0 ml) and a further portion of 2-bromoethanol (0.5 ml) were added and heating was continued for 16 h. The volatiles were removed in vacuo from the cooled reaction mixture. The residue was partitioned between ethyl acetate and water. The organic phase was dried (Na2SO4) and the solvent removed in vacuo. Chromatography (silica gel, 0-5% methanol-ethyl acetate) afforded the title compound as a white solid (78 mg, 29%).

Workup

  1. customonly a minor amount of product had formed (MS)
  2. temperatureheating
  3. waitwas continued for 16 h
  4. customThe volatiles were removed in vacuo from the cooled reaction mixture
  5. customThe residue was partitioned between ethyl acetate and water
  6. dry with materialThe organic phase was dried (Na2SO4)
  7. customthe solvent removed in vacuo

Sources & evidence

ORD record
ord-237203c9f2d445a09dce92101ef57f79
Source dataset
uspto-grants-2011_04
Patent number
US07928125B2

Reaction notes

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