Triethylamine → 3-[5-chloro-2-methyl-4-(6-methyl-pyridin-2-ylmethoxy)-6-oxo-6H-pyrimidin-1-yl]-N-methoxy-4,N-dimethyl-benzamide

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Reaction Steps

To a solution of 3-[5-chloro-2-methyl-4-(6-methyl-pyridin-2-ylmethoxy)-6-oxo-6H-pyrimidin-1-yl]-4-methyl-benzoic acid methyl ester from Step A (108 mg, 0.26 mmol) in tetrahydrofuran (1 mL) was added 1N sodium hydroxide (1 mL) and the solution stirred at ambient temperature for eighteen hours. The solution was concentrated in vacuo and the aqueous residue was acidified to pH=2 using 1M HCl. The solution was extracted with ethyl acetate, washed with water and dried over magnesium sulfate. The slurry was filtered and concentrated to give an orange oil which was used without any additional purification. To a solution of the crude acid in tetrahydrofuran (2 mL) was added 1,1′-carbonyldiimidazole (63 mg, 0.39 mmol). After stifling at ambient temperature for one hour, N,N-dimethylhydroxylamine HCl (38 mg, 0.39 mmol) and triethylamine (0.07 mL, 0.52 mmol) were added. The solution continued to stir for eighteen hours. The solution was partitioned between ethyl acetate and water. The organic layer was washed with saturated sodium bicarbonate, water, and brine and dried over magnesium sulfate. The slurry was filtered and concentrated to provide the amide as a light brown oil (73 mg, 63%). MS (M+H): 443

Provenance & Evidence