Sodium hydride → Ethyl 4-[3-(2-tert-butoxy-2-oxoethyl)-2-oxo-2,3-dihydro-1H-benzimidazol-1-yl]benzoate

HRID 1270367Notes

Reaction equation

HRID 1270367 reaction equation
[O:1]=[C:2]1[N:6]([C:7]2[CH:17]=[CH:16][C:10]([C:11]([O:13][CH2:14][CH3:15])=[O:12])=[CH:9][CH:8]=2)[C:5]2[CH:18]=[CH:19][CH:20]=[CH:21][C:4]=2[NH:3]1.[H-].[Na+].Br[CH2:25][C:26]([O:28][C:29]([CH3:32])([CH3:31])[CH3:30])=[O:27]>CN(C=O)C>[C:29]([O:28][C:26](=[O:27])[CH2:25][N:3]1[C:4]2[CH:21]=[CH:20][CH:19]=[CH:18][C:5]=2[N:6]([C:7]2[CH:17]=[CH:16][C:10]([C:11]([O:13][CH2:14][CH3:15])=[O:12])=[CH:9][CH:8]=2)[C:2]1=[O:1])([CH3:32])([CH3:31])[CH3:30]

Participants

5

Reactant 3

HCID 24758Sodium hydrideHCID 79177tert-Butyl bromoacetateHCID 18449399Ethyl 4-(2-oxo-2,3-dihydro-1H-benzimidazol-1-yl)benzoate

Product 1

HCID 18449400Ethyl 4-[3-(2-tert-butoxy-2-oxoethyl)-2-oxo-2,3-dihydro-1H-benzimidazol-1-yl]benzoate

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

To a stirred solution of ethyl 4-(2-oxo-2,3-dihydro-1H-benzimidazol-1-yl)benzoate from Step C (590 mg, 2.09 mmol) in DMF (10 mL) at 0° C. was added sodium hydride (104 mg of a 60% dispersion in mineral oil, 2.60 mmol). The mixture was stirred for 5 min, then tert-butyl bromoacetate (489 mg, 2.51 mmol) was added and stirring was continued for 3 h. The reaction mixture was partitioned between EtOAc (200 mL) and H2O (100 mL). The organic layer was washed with H2O (50 mL), then brine (50 mL), then dried over Na2SO4, filtered, and concentrated under reduced pressure. The crude product was purified by silica gel chromatography, eluting with a gradient of hexane::EtOAc—100:0 to 0:100, to give the title compound. MS: m/z=397 (M+1).

Workup

  1. stirringstirring
  2. waitwas continued for 3 h
  3. customThe reaction mixture was partitioned between EtOAc (200 mL) and H2O (100 mL)
  4. washThe organic layer was washed with H2O (50 mL)
  5. dry with materialbrine (50 mL), then dried over Na2SO4
  6. filtrationfiltered
  7. concentrationconcentrated under reduced pressure
  8. customThe crude product was purified by silica gel chromatography
  9. washeluting with a gradient of hexane

Sources & evidence

ORD record
ord-76a7bb29f56743408c4acc6954ebb735
Source dataset
uspto-grants-2007_04
Patent number
US07202251B2

Reaction notes

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