Cesium carbonate → Methyl 4-((6-(methylamino)pyrimidin-4-yl)amino)-3-nitrobenzoate

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6-chloro-N-methylpyrimidin-4-amine, 3 (3 g, 20.97 mmol) and methyl 4-amino-3-nitrobenzoate (3.9 g, 20.97 mmol) were taken in toluene (5 mL) in a seal tube under Argon atmosphere at room temperature. The Argon gas was purged for 5-10 min. Then Cs2CO3 (17.0 g, 52.4 mmol) and Xantphos (3.6 g, 6.29 mmol) were added and the resulting reaction mixture was purged with argon gas for 5 min, followed by Pd2(dba)3 (3.8 g, 4.19 mmol) was added. The argon gas purging was continued for additional 5 min before sealing the reaction vial. Then the reaction mixture was heated at 110° C. for 16 h. After completion of the reaction by TLC, the reaction mixture was cooled to rt, filtered through celite bed and the filtrate was evaporated under vacuum to get a crude residue. The crude residue was purified by column chromatography on silica gel to afford the title compound (3.2 g, yield: 51%) as a solid; MS (ESI): 304.2 [M+H]+.

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