2-Fluoropyridine-5-carbonyl chloride → 3-(5-(6-Fluoropyridin-3-yl)-1,2,4-oxadiazol-3-yl)benzonitrile

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Reaction Steps

3-Cyano-N′-hydroxybenzimidamide (0.322 g, 1 mmol) was dissolved in pyridine 10 mL and 6-fluoronicotinoyl chloride (Frontier Scientific, 0.160 g, 1 mmol) was added. The reaction mixture was heated to reflux for 3 hours and then cooled to room temperature. The cooled reaction mixture was quenched with water (25 mL) and filtered. The solid was further purified with flash column chromatography (5% methanol/dichloromethane) to give the titled product. 1H NMR (300 MHz, DMSO-d6) δ 7.56-7.52 (m, 1 H), 7.85 (t, J=7.9 Hz, 1 H), 8.15-8.12 (m, 1 H), 8.43-8.41 (m, 1 H), 8.49 (m, 1 H), 8.8-8.74 (m, 1 H), 9.11-9.0 (m, 1 H) ppm; MS (DCI/NH3) m/z 267 (M+H)+.

Provenance & Evidence