Ethyl Acetate → 5-(3-chlorophenyl)-N-methoxy-N-methylbenzamide

HRID 1725028Notes

Reaction equation

HRID 1725028 reaction equation
N[C:2]1[CH:13]=[CH:12][C:11](Br)=[CH:10][C:3]=1[C:4]([N:6]([O:8][CH3:9])[CH3:7])=[O:5].[Cl:15][C:16]1[CH:17]=[C:18](B(O)O)[CH:19]=[CH:20][CH:21]=1.C(=O)([O-])[O-].[Na+].[Na+].C(OCC)(=O)C>COCCOC.O.[Cl-].[Na+].O.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[Cl:15][C:16]1[CH:21]=[C:20]([C:11]2[CH:12]=[CH:13][CH:2]=[C:3]([CH:10]=2)[C:4]([N:6]([O:8][CH3:9])[CH3:7])=[O:5])[CH:19]=[CH:18][CH:17]=1

Participants

9

Reactant 4

HCID 8857Ethyl AcetateHCID 10340Sodium CarbonateHCID 2734323(3-Chlorophenyl)boronic acidHCID 159081302-amino-5-bromo-N-methoxy-N-methylbenzamide

Product 1

HCID 220218875-(3-chlorophenyl)-N-methoxy-N-methylbenzamideYield 60.4%

Reagents, catalysts & solvents 4

HCID 178418397HCID 178418397, compoundCatalystHCID 962WaterSolventHCID 80711,2-DimethoxyethaneSolventHCID 57417360Sodium chloride; waterSolvent

Conditions

Temperature
85 °C

Procedure

A mixture of 2-amino-5-bromo-N-methoxy-N-methylbenzamide (7.78 g, 30 mmol), 3-chlorophenyl boronic acid (5.63 g, 36 mmol), tetrakis(triphenylphosphine)palladium (0) (1.73 g, 1.5 mmol), and sodium carbonate, (7.63 g, 72 mmol) in a mixture of DME and water (150 mL/30 mL) was degassed to remove the oxygen and heated at 85° C. under nitrogen for 3 hours. The reaction, mixture was cooled to room temperature and treated with brine (30 mL) and ethyl acetate (100 mL). The organic layer was separated and aqueous layer was extracted with ethyl acetate (3×40 mL). The combined organic layers were washed with brine and dried with MgSO4. After removal of solvent, the residue was purified by a flash chromatography (silica gel, hexane:ethyl acetate/1:1) to give 5-(3-chlorophenyl)-N-methoxy-N-methylbenzamide as a brown oil (5 g, 57%). To a solution of this benzamide (5 g, 17.2 mmol) in anhydrous THF was added in a dropwise fashion a solution of methyllithium in ether (1.4M, 28.6 mL, 40 mL) at −78° C. under nitrogen. After stirring for 30 minutes, the reaction mixture was treated with a saturated aqueous ammonium chloride solution (50 mL) at −78° C. Ethyl acetate (100 mL) was added, organic layer was separated, and aqueous layer was extracted with ethyl acetate (3×20 mL). The combined organic layers were washed (brine) and dried (MgSO4). After removal of solvent, the residue was purified by a flash chromatography (silica gel, hexane: ethyl acetate/2:1) to afford 1-(4-amino-3′-chloro-biphenyl-3-yl)-ethanone as a yellow solid (2 g, 47%): mp 89-90° C.; 1H-NMR (CDCl3) δ 7.89 (d, 1H, J=2.0 Hz), 7.51 (m, 2H), 7.25-7.40 (m, 3H), 6.73 (d, 1H, J=8.6 Hz), 6.38 (br, 2H), 2.65 (s, 3H); MS (EI) m/z 268([M+Na]+, 60%); Anal. Calc. For C14H12ClNO: C, 68.44; H, 4.92; N, 5.70. Found: C, 68.40; H, 4.89; N, 5.61.

Workup

  1. customwas degassed
  2. customto remove the oxygen
  3. customThe reaction, mixture
  4. temperaturewas cooled to room temperature
  5. customThe organic layer was separated
  6. extractionaqueous layer was extracted with ethyl acetate (3×40 mL)
  7. washThe combined organic layers were washed with brine
  8. dry with materialdried with MgSO4
  9. customAfter removal of solvent
  10. customthe residue was purified by a flash chromatography (silica gel, hexane:ethyl acetate/1:1)

Sources & evidence

ORD record
ord-afbce8562ce844b5b40f3fcd6994188d
Source dataset
uspto-grants-2009_02
Patent number
US07488822B2

Reaction notes

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