N,N-Dimethylglycine → 6-(3-isopropylphenoxy)-1-methyl-3-(3-(tetrahydro-2H-pyran-2-yloxy)propyl)pyrido[2,3-d]pyrimidine-2,4(1H,3H)-dione

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To a solution of 6-bromo-1-methyl-3-(3-(tetrahydro-2H-pyran-2-yloxy)propyl)pyrido[2,3-d]pyrimidine-2,4(1H,3H)-dione (See Compound 20, step 4, 400 mg, 1 mmol), CuI (24.7 mg, 0.13 mmol), Cs2CO3 (650 mg, 2 mmol) and 2-(dimethylamino)acetic acid (51.5 mg, 0.5 mmol) in dioxane (6 mL) was added 3-isopropylphenol (204 mg, 1.5 mmol). The reaction was heated at 140° C. (MW) for 1.5 h then cooled to RT and filtered. The filtrate was diluted with EA (5 mL) and water (5 mL). The organic layer was dried over Na2SO4 and concentrated to a residue which was purified by chromatography eluted with PE/EA (5:1) to give 6-(3-isopropylphenoxy)-1-methyl-3-(3-(tetra hydro-2H-pyran-2-yloxy)propyl)pyrido[2,3-d]pyrimidine-2,4(1H,3H)-dione (250 mg, 55% yield) as a solid. LCMS: MH+ 454 and TR=2.156 min.

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