6-bromo-5-((4-chlorophenyl)(hydroxy)methyl)-1-methyl-3-(3-((tetrahydro-2H-pyran-2-yl)oxy)propyl)pyrido[2,3-d]pyrimidine-2,4(1H,3H)-dione → 3-(6-bromo-5-(4-chlorobenzyl)-1-methyl-2,4-dioxo-1,2-dihydropyrido[2,3-d]pyrimidin-3(4H)-yl)propyl formate

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To a solution of 6-bromo-5-((4-chlorophenyl)(hydroxy)methyl)-1-methyl-3-(3-(tetrahydro-2H-pyran-2-yloxy)propyl)pyrido[2,3-d]pyrimidine-2,4(1H,3H)-dione (300 mg, 0.56 mmol) in HCOOH (10 mL) was added Zn dust (182 mg, 2.78 mmol). The reaction was heated at 60° C. for 1 h then cooled to RT and filtered. The filtrate was concentrated to a residue which was purified by Prep TLC eluted with PE/EA (1:2) to give 3-(6-bromo-5-(4-chlorobenzyl)-1-methyl-2,4-dioxo-1,2-dihydropyrido[2,3-d]pyrimidin-3(4H)-yl)propyl formate (190 mg, 73% yield) as a white solid. LCMS: MH+ 468 and TR=1.893 min.

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