Ammonia → 5-bromo-2,3-dihydro-1H-isoindol-1-one

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Reaction Steps

4-Bromo-2-bromomethyl-benzoic acid methyl ester (0.5 g, 16.2 mmol) is treated with methanolic ammonia (10 mL, 7 N NH3 in MeOH) for 5 minutes at 90° C. After cooling to room temperature a precipitate is formed, collected by filtration and washed with a small amount of methanol to afford the title compound as a colourless solid (224 mg, 65%). 1H-NMR (400 MHz, d6-DMSO) δ (ppm) 4.41 (2H, s), 7.64 (1H, d), 7.70 (1H, d), 7.87 (1H, s), 8.67 (1H, br s). LCMS: Rt 2.49 min, (99.6%), m/z (APCI) 212 (M+H)+.

Provenance & Evidence