Dimethyl Sulfoxide → 6-bromo-1-methyl-2,4-dioxo-3-(3-((tetrahydro-2H-pyran-2-yl)oxy)propyl)-1,2,3,4-tetrahydrothieno[2,3-d]pyrimidine-5-carbaldehyde

Participants

Reaction Conditions

Reaction Steps

To a solution of 6-bromo-5-(bromomethyl)-1-methyl-3-(3-(tetrahydro-2H-pyran-2-yloxy)propyl) thieno[2,3-d]pyrimidine-2,4(1H,3H)-dione (1.7 g, 3.43 mmol) in DMSO (20 mL) was added IBX (1.92 g, 6.85 mmol). The reaction was heated at 50° C. for 2 h, cooled to RT then diluted with EA (80 mL) and water (50 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-bromo-1-methyl-2,4-dioxo-3-(3-(tetrahydro-2H-pyran-2-yloxy)propyl)-1,2,3,4-tetrahydrothieno[2,3-d]pyrimidine-5-carbaldehyde (500 mg, 33.8% yield) as a yellow oil. LCMS: MH+ 431 and TR=1.313 min.

Provenance & Evidence