Lithium hydroxide (0.08 g, 2.99 mmol) was added to a solution of methyl 4-((tert-butoxycarbonyl)(6-(3-(tert-butoxycarbonyl)-3-(2,6-dichloro-3,5-dimethoxyphenyl)-1-methylureido)pyrimidin-4-yl)amino)-3-nitrobenzoate (1.5 g, 1.997 mmol) (Procedure 2J, Step c) in a mixture of THF (10 mL) and water (2 mL) at 0° C. The resulting reaction mixture was allowed to warm to room temperature and stirred for 5 h. After completion of the reaction by TLC (EtOAc:Hexane 3:7), the reaction mixture was concentrated under vacuum to get a crude residue. The crude residue was dissolved in water and extracted with ether (3×30 mL). The aqueous layer was acidified with 10% citric acid solution and the precipitated solid was filtered, washed with cold water and dried in vacuo to afford the title compound (1.3 g, yield: 93%) as a light brown solid. MS (ESI): 737.2 [M+H]+.
