A suspension of 2,4-dichloro-7-[(4-methylphenyl)sulfonyl]-7H-pyrrolo[2,3-d]pyrimidine (2 g, 5.84 mmols), 2-amino-6-bromobenzoic acid (2.53 g, 11.69 mmols), and N-ethyl-N-(1-methylethyl)-2-propanamine (7.55 g, 58.4 mmols) in 2-propanol (150 ml) was heated at 90° C. for 5 days. The solvent was removed, residue redissolved in DCM (150 ml), washed with 1M HCl(100 ml), organic layer separated, adsorbed onto silica gel, and purified by silica gel chromatography (DCM to 10% MeOH/DCM). The crude product was then recrystallized from ethyl acetate/hexanes to obtain 2-bromo-6-({2-chloro-7-[(4-methylphenyl)sulfonyl]-7H-pyrrolo[2,3-d]pyrimidin-4-yl}amino)benzoic acid (1.5 g, 49%). ESIMS (M+H)+=521.
