A mixture of 5-(7-amino-6-bromo-3-quinolin-3-yl-pyrazolo[1,5-a]pyrimidin-5-yl)-piperidine-2-carboxylic acid methyl ester (20 mg, 0.042 mmol), methoxy-acetyl chloride (13 mg, 0.071 mmol) and triethylamine (0.024 ml, 0.167 mmol) in THF:DMF (0.5 ml:0.5 ml) was stirred at room temperature for 16 h. The crude mixture was treated with 2.0 N sodium hydroxide solution (0.14 ml) at room temperature for 16 h. The reaction mixture was acidified with 1.0 N aqueous hydrogen chloride solution (0.5 ml), concentrated and purified by prep-LC to afford the title compound (7.94 mg): LC/MS RT=3.06 min. Mass calculated for, M+H 539.10, observed 539.10.
