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2-Fluoro-4-(methylsulfonyl)benzoic acid (1 g, 4.6 mmol) dissolved in DCM (15 ml), cooled to 0° C. and added oxalyl chloride (0.6 ml, 6.9 mmol). Catalytic amount of DMF was added to this mixture and stirred at rt for 30 mins. After 30 mins, DCM removed on rotavapour and co-distilled the residue two times with DCM to obtain 2-fluoro-4-(methylsulfonyl)benzoyl chloride quantitatively. 2,5-Dibromoaniline (0.9 g, 3.59 mmol) dissolved in DCM (10 ml) and added Pyridine (0.34 g, 4.30 mmol) under nitrogen atmosphere. This mixture stirred at rt for 30 mins and added 2-fluoro-4-(methylsulfonyl)benzoyl chloride (1.01 g, 3.59 mmol). After continuing stirring at rt for 15 mins, reaction mass diluted with water and extracted with DCM. DCM layer washed with aq. NaHCO3 and DCM removed on rotavapour to obtain the solid. Solid was triturated with Et2O and Petether mixture (4:1) to obtain the titled compound (1.6 g) as a brown solid. 1H-NMR (δ ppm, DMSO-d6, 400 MHz): 10.34 (s, 1H), 8.34-7.99 (m, 1H), 7.98-7.93 (m, 2H), 7.92-7.89 (m, 1H), 7.68 (d, J 8.6, 1H), 7.43 (dd, J 2.4, 8.6, 1H), 3.33 (s, 3H).

1. waitAfter 30 mins
2. customDCM removed on rotavapour