Ethyl Acetate → 3-(4,4-Dimethyl-2-trifluoromethyl-1,4-dihydro-2H-benzo[d][1,3]oxazin-6-yl)-5-fluoro-benzonitrile

HRID 2120744Notes

Reaction equation

HRID 2120744 reaction equation
Br[C:2]1[CH:3]=[CH:4][C:5]2[NH:10][CH:9]([C:11]([F:14])([F:13])[F:12])[O:8][C:7]([CH3:16])([CH3:15])[C:6]=2[CH:17]=1.[C:18]([C:20]1[CH:21]=[C:22](B(O)O)[CH:23]=[C:24]([F:26])[CH:25]=1)#[N:19].C(=O)([O-])[O-].[Na+].[Na+].C(OCC)(=O)C>COCCOC.O.[Pd].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>[CH3:15][C:7]1([CH3:16])[C:6]2[CH:17]=[C:2]([C:22]3[CH:21]=[C:20]([CH:25]=[C:24]([F:26])[CH:23]=3)[C:18]#[N:19])[CH:3]=[CH:4][C:5]=2[NH:10][CH:9]([C:11]([F:14])([F:13])[F:12])[O:8]1

Participants

8

Reactant 4

HCID 8857Ethyl AcetateHCID 10340Sodium CarbonateHCID 234355726-bromo-4,4-dimethyl-2-(trifluoromethyl)-1,4-dihydro-2H-3,1-benzoxazineHCID 23435605(3-Cyano-5-fluorophenyl)boronic acid

Product 1

HCID 234355873-(4,4-Dimethyl-2-trifluoromethyl-1,4-dihydro-2H-benzo[d][1,3]oxazin-6-yl)-5-fluoro-benzonitrileYield 73%

Reagents, catalysts & solvents 3

HCID 11979704Tetrakis(triphenylphosphine)palladiumCatalystHCID 962WaterSolventHCID 80711,2-DimethoxyethaneSolvent

Conditions

Temperature
85 °C

Procedure

A mixture of 6-bromo-4,4-dimethyl-2-(trifluoromethyl)-1,4-dihydro-2H-3, 1-benzoxazine (0.5 g, 1.61 mmol), 3-cyano-5-fluorobenzeneboronic acid (0.39 g, 1.8 mmol), tetrakis(triphenylphosphine)-palladium (0) (0.2 g, 0.161 mmol), and sodium carbonate (0.5 g, 4.83 mmol) in DME (50 mL) and water (25 mL) was subject to a blanket of nitrogen flow for 15 minutes at 50° C. and then was heated at 85° C. under nitrogen for 1 hour. The reaction mixture was cooled to room temperature and ethyl acetate (200 mL) was added. The organic layer was washed twice with aqueous ammonium chloride (20 mL) and once with brine (20 mL), dried over sodium sulfate and concentrated to a yellow solid. Purification via flash column chromatography (silica gel, 5% ethyl acetate/hexane) gave 3-[4,4-dimethyl-2-(trifluoromethyl)-1,4-dihydro-2H-3,1-benzoxazin-6-yl]-5-fluorobenzonitrile (0.396 g, 73%) as a white solid: mp 102-103° C.; 1H-NMR (DMSO-d6) δ 8.07 (s, 1H), 7.91 (d, 1H, J=10.7 Hz), 7.7 (d, 1H, J=10.7 Hz) 7.62 (d, 1H, J=1.98 Hz), 7.53 (dd, 1H, J=8.33, 1.98 Hz), 7.05 (s, 1H), 6.87 (d, 1H, J=8.33 Hz), 5.39-5.37 (m, 1H), 1.61 (s, 3H), 1.59 (s, 3H); MS (ES) m/z 349 ([M−H]−).

Workup

  1. temperatureThe reaction mixture was cooled to room temperature
  2. washThe organic layer was washed twice with aqueous ammonium chloride (20 mL) and once with brine (20 mL)
  3. dry with materialdried over sodium sulfate
  4. concentrationconcentrated to a yellow solid
  5. customPurification via flash column chromatography (silica gel, 5% ethyl acetate/hexane)

Sources & evidence

ORD record
ord-ba9c883790df435a92c4d71b7baa318d
Source dataset
uspto-grants-2004_02
Patent number
US06693103B2

Reaction notes

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