Potassium Carbonate → HCID 66980583, compound

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A mixture of methyl 4-chloro-2-iodobenzoate (0.593 g, 2 mmol), methyl 3,4-diaminobenzoate (0.332 g, 2 mmol), copper (0.126 g, 2 mmol), and K2CO3 (0.276 g, 2 mmol) in chlorobenzene (40 mL) was heated to reflux for 20 hours, cooled to room temperature, diluted with ethyl acetate, and filtered through diatomaceous earth (Celite®). The solution was washed with water and brine, dried (MgSO4), filtered, and concentrated under vacuum. The residue was purified by flash column chromatography on silica gel with 7:3 hexanes/ethyl acetate to provide 0.453 g (68%) of the desired product. MS (DCI) m/e 334 (M+H)+, 352 (M+NH4)+; 1H NMR (300 MHz, DMSO-d6) δ 8.99 (s, 1H), 7.89 (d, J=8.5 Hz, 1H), 7.47 (d, J=1.0 Hz, 1H), 7.21 (m, 2H), 6.80 (dd, J=8.5, 2.0 Hz, 1H), 6.65 (d, J=2.1 Hz, 1H), 5.30 (s, 2H), 3.86 (s, 3H), 3.82 (s, 3H).

Provenance & Evidence