2-Iodoxybenzoic acid → 1-methyl-5-(3-methylbutanoyl)-3-(3-((tetrahydro-2H-pyran-2-yl)oxy)propyl)-6-(3-(trifluoromethoxy)phenyl)thieno[2,3-d]pyrimidine-2,4(1H,3H)-dione

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To a solution of 5-(1-hydroxy-3-methylbutyl)-1-methyl-3-(3-((tetrahydro-2H-pyran-2-yl)oxy) propyl)-6-(3-(trifluoromethoxy)phenyl)thieno[2,3-d]pyrimidine-2,4(1H,3H)-dione (See Compound 22, Step 3, 50 mg, 0.088 mmol) in DMSO (5 mL) was added 2-iodoxybenzoic acid (49.1 mg, 0.176 mmol). The reaction was heated at 50° C. for 2 h, cooled to RT, diluted with water (20 mL) and extracted with EA (3×10 mL). The combined organic layers were washed with aq. NH4Cl (5 mL), dried over Na2SO4 and concentrated to a residue which was purified by chromatography eluted with PE/EA (5:1 to 1:1) to give 1-methyl-5-(3-methylbutanoyl)-3-(3-((tetrahydro-2H-pyran-2-yl)oxy)propyl)-6-(3-(trifluoromethoxy)phenyl)thieno[2,3-d]pyrimidine-2,4(1H,3H)-dione (30 mg, 60.2% yield) as an oil. LCMS: MH+ 569 and TR=2.186 min.

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