Cesium carbonate → 4-(2-chloro-3'-fluoro-5-methoxy-[1,1'-biphenyl]-4-yl)-N-(1,2,4-thiadiazol-5-yl)quinazoline-7-sulfonamide

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Reaction Steps

A vial was charged with perfluorophenyl 4-(2-chloro-3′-fluoro-5-methoxy-[1,1′-biphenyl]-4-yl)quinazoline-7-sulfonate (0.060 g, 0.098 mmol), 1,2,4-thiadiazol-5-amine (10.93 mg, 0.108 mmol), and cesium carbonate (0.096 g, 0.295 mmol). The vial was flushed with Ar (g), then acetonitrile (0.491 ml) was added. The reaction was stirred overnight at room temperature. The mixture was diluted with EtOAc and 1 N aq. HCl. The layers were separated, and the aq. layer was extracted with EtOAc (2×). The combined organic extracts were dried over sodium sulfate, filtered, and concentrated. The residue was purified by chromatography on silica gel (12-g Redi-Sep Gold column, 0-10% MeOH/DCM) to give 4-(2-chloro-3′-fluoro-5-methoxy-[1,1′-biphenyl]-4-yl)-N-(1,2,4-thiadiazol-5-yl)quinazoline-7-sulfonamide as an off-white solid. 1H NMR (400 MHz, DMSO-d6) δ=9.55-9.42 (m, 1H), 8.44-8.35 (m, 2H), 8.01 (td, J=2.0, 8.8 Hz, 1H), 7.96-7.89 (m, 1H), 7.67 (dd, J=1.5, 2.3 Hz, 1H), 7.63-7.54 (m, 1H), 7.49-7.41 (m, 2H), 7.38-7.28 (m, 2H), 3.75 (d, J=2.2 Hz, 3H). m/z (ESI) 529.8 (M+H)+.

Provenance & Evidence