Trimethylsilyl iodide → 2-fluoro-N-(2-oxo-1H-pyridin-4-yl)-5-(trifluoromethyl)benzamide

HRID 2170410Notes

Reaction equation

[F:1][C:2]1[CH:18]=[CH:17][C:16]([C:19]([F:22])([F:21])[F:20])=[CH:15][C:3]=1[C:4]([NH:6][C:7]1[CH:12]=[CH:11][N:10]=[C:9]([O:13]C)[CH:8]=1)=[O:5].[Si](I)(C)(C)C>C(#N)C>[F:1][C:2]1[CH:18]=[CH:17][C:16]([C:19]([F:22])([F:20])[F:21])=[CH:15][C:3]=1[C:4]([NH:6][C:7]1[CH:12]=[CH:11][NH:10][C:9](=[O:13])[CH:8]=1)=[O:5]

Participants

Conditions

Temperature: 50 °C

Procedure

To 2-fluoro-N-(2-methoxy-4-pyridyl)-5-(trifluoromethyl)benzamide (3.54 g, 11.27 mmol) in acetonitrile (118.0 mL) was added TMSI (4.0 mL, 28.18 mmol). The reaction was stirred at 50° C. overnight. The acetonitrile was evaporated and the crude re-dissolved in ethyl acetate. The organics were washed with water, dried over sodium sulfate, filtered and concentrated. Purification by silica gel chromatography using a gradient of ethyl acetate in hexanes (0-100%) and then methanol in dichloromethane (0-20%) gave 2-fluoro-N-(2-oxo-1H-pyridin-4-yl)-5-(trifluoromethyl)benzamide (3 g, 89%), as a brown solid. ESI-MS m/z calc. 300.05. found 301.3 (M+1)+; Retention time: 1.34 minutes (3 minutes run). 1H NMR (400 MHz, DMSO-d6) δ 10.85 (s, 1H), 8.10 (dd, J=6.0, 2.2 Hz, 1H), 8.03 (m, 1H), 7.65 (t, J=9.2 Hz, 1H), 7.49 (d, J=7.1 Hz, 1H), 6.97 (d, J=2.0 Hz, 1H), 6.57 (dd, J=7.2, 2.1 Hz, 1H), 5.07 (s, 2H) ppm.

Workup

customThe acetonitrile was evaporated
dissolutionthe crude re-dissolved in ethyl acetate
washThe organics were washed with water
dry with materialdried over sodium sulfate
filtrationfiltered
concentrationconcentrated
customPurification by silica gel chromatography

Sources & evidence

ORD record: ord-f4783379daf649299583e33b9b0a68f8
Source dataset: uspto-grants-2015_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09051270B2

Reaction notes

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