Acetyl chloride → 4-(1-Acetyl-4,4-dimethyl-2-trifluoromethyl-1,4-dihydro-2H-benzo[d][1,3]oxazin-6-yl)-thiophene-2-carbonitrile

HRID 2120746Notes

Reaction equation

HRID 2120746 reaction equation
[CH3:1][C:2]1([CH3:23])[C:7]2[CH:8]=[C:9]([C:12]3[CH:13]=[C:14]([C:17]#[N:18])[S:15][CH:16]=3)[CH:10]=[CH:11][C:6]=2[NH:5][CH:4]([C:19]([F:22])([F:21])[F:20])[O:3]1.[H-].[Na+].[C:26](Cl)(=[O:28])[CH3:27]>CN(C=O)C.[Cl-].[Na+].O>[C:26]([N:5]1[C:6]2[CH:11]=[CH:10][C:9]([C:12]3[CH:13]=[C:14]([C:17]#[N:18])[S:15][CH:16]=3)=[CH:8][C:7]=2[C:2]([CH3:23])([CH3:1])[O:3][CH:4]1[C:19]([F:22])([F:20])[F:21])(=[O:28])[CH3:27]

Participants

6

Reactant 3

HCID 6367Acetyl chlorideHCID 24758Sodium hydrideHCID 234355804-[2-(Trifluoromethyl)-4,4-dimethyl-1,4-dihydro-2H-3,1-benzoxazine-6-yl]-2-thiophenecarbonitrile

Product 1

HCID 234355944-(1-Acetyl-4,4-dimethyl-2-trifluoromethyl-1,4-dihydro-2H-benzo[d][1,3]oxazin-6-yl)-thiophene-2-carbonitrileYield 36%

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 57417360Sodium chloride; waterSolvent

Procedure

4-[4,4-dimethyl-2-(trifluoromethyl)-1,4-dihydro-2H-3,1-benzoxazin-6-yl]thiophene-2-carbonitrile (0.25 g, 0.74 mmol) was dissolved in DMF (10 mL), NaH (0.09 g, 2.22 mmol) was added and the mixture was stirred for 30 minutes prior to the addition of acetyl chloride (0.079 mL, 1.11 mmol). Upon disappearance of the starting material the reaction mixture was poured into brine (100 mL) and the product extracted with ether (150 mL), dried over sodium sulfate and concentrated. The residue was purified by a flash column chromatography (silica gel, 25% ethyl acetate/hexane) to yield 4-[1-acetyl-4,4-dimethyl-2-(trifluoromethyl)-1,4-dihydro-2H-3,1-benzoxazin-6-yl]thiophene-2-carbonitrile (0.1 g, 36%) as an amorphous solid: 1H-NMR (DMSO-d6) δ 8.58 (s, 1H), 8.5 (s, 1H), 7.83-7.80 (m, 2H), 7.64 (d, 1H, J=8.74 Hz), 6.42 (q, 1H, J=10 Hz), 2.24 (s, 3H), 1.73 (s, 3H), 1.42 (s, 3H).

Workup

  1. extractionthe product extracted with ether (150 mL)
  2. dry with materialdried over sodium sulfate
  3. concentrationconcentrated
  4. customThe residue was purified by a flash column chromatography (silica gel, 25% ethyl acetate/hexane)

Sources & evidence

ORD record
ord-4d40a3f84fa241f7adbd418582525d39
Source dataset
uspto-grants-2004_02
Patent number
US06693103B2

Reaction notes

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