To a solution of 3-(5-benzyl-6-(3-isopropylphenoxy)-1-methyl-2,4-dioxo-1,2-dihydropyrido[2,3-d]pyrimidin-3(4H)-yl)propyl formate (50 mg, 0.10 mmol) in THF (3 ml) and water (3 mL) was added LiOH.H2O (10 mg, 0.20 mmol). The reaction was stirred at RT for 15 min then diluted with EA (30 mL) and water (30 mL). The organic layer was dried over Na2SO4 and concentrated to give a residue which was purified by Prep HPLC to give 5-benzyl-3-(3-hydroxypropyl)-6-(3-isopropyl phenoxy)-1-methylpyrido[2,3-d]pyrimidine-2,4(1H,3H)-dione (15 mg, 45% yield) as a solid. 1H NMR (CDCl3) δ: 8.32 (s, 1H), 7.29 (s, 2H), 7.25-7.12 (m, 4H), 6.99 (d, J=7.9 Hz, 1H), 6.76 (s, 1H), 6.68 (dd, J=8.0, 2.3 Hz, 1H), 4.80 (s, 2H), 4.24 (t, J=6.0 Hz, 2H), 3.70 (s, 3H), 3.52 (dd, J=11.8, 6.2 Hz, 2H), 3.10 (t, J=7.0 Hz, 1H), 2.85 (dt, J=13.9, 6.9 Hz, 1H), 1.98-1.83 (m, 2H), 1.22 (d, J=6.9 Hz, 6H). LCMS: MH+ 460 and TR=3.376 min.
