Water → 2-(6-Bromopyridin-3-ylamino)-5-chlorobenzoic acid

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A mixture of 6-bromopyridin-3-amine (27.27 mmol, 4.70 g), 2,5-dichlorobenzoic acid (54.34 mmol, 10.38 g), Cu (2.71 mmol, 0.2 g), Cu2O (1.36 mmol, 0.2 g) and K2CO3 (54.27 mmol, 7.5 g) in 1,2-dimethoxiethane (40 ml) was heated in a microwave oven at 130° C. for 14 hours, under nitrogen atmosphere. Water was added and the mixture was filtered through celite and extracted with AcOEt. The organic phase was washed with saturated K2CO3 aqueous solution and brine. The solvent was evaporated to afford 3.08 g (yield 31%) of the expected product.

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