Cesium carbonate → Tert-butyl 2-(6-(5-bromo-1-methyl-2-oxo-1,2-dihydropyridin-3-ylamino)pyridin-2-yloxy)ethylcarbamate

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Reaction Conditions

Reaction Steps

A mixture of compound 101a (7.0 g, 23.75 mmol), 2-(tert-butoxycarbonylamino)ethyl 4-methylbenzenesulfonate (3.0 g, 9.5 mmol) and Cs2CO3 (3.7 g, 11.4 mmol) in DMF (40 mL) was stirred at 100° C. for 4 h. The reaction mixture was concentrated. The residue was treated with EA and filtered. The filtrate was washed with water. The organic layer was separated, dried over Na2SO4, filtered and concentrated to give Tert-butyl 2-(6-(5-bromo-1-methyl-2-oxo-1,2-dihydropyridin-3-ylamino)pyridin-2-yloxy)ethylcarbamate 101b (650 mg, 15% for two steps) as a yellow solid. A mixture of 101b (700 mg, 1.6 mmol) in HCl (5 mL, 4M in 1,4-dioxane, 20 mmol) was stirred at rt overnight. The reaction mixture was concentrated to give 103a (550 mg, 83%) as yellow solid. MS-ESI: [M+H]+ 341.0

Provenance & Evidence