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7-(4-Chlorobenzyl)-3-methyl-1-(2-oxopropyl)-8-(3-(trifluoromethoxy)phenoxy)-1H-purine-2,6(3H,7H)-dione (0.18 g, 0.35 mmol, example 348) was dissolved in methanol (3 mL) and cooled to 0° C. Then sodium borohydride (0.040 g, 1.05 mmol) was added portion wise over 20 minutes. The reaction was stirred in the cold for 2 h. The reaction solvent was removed under reduced pressure, then diluted with water (100 mL) and extracted with ethyl acetate (3×75 mL). The combined extracts were dried with magnesium sulfate, filtered and evaporated under reduced pressure to a light golden solid. Solid was purified using a 12 g silica gel flash column eluted with 1% methanol/DCM to give 7-(4-chlorobenzyl)-1-(2-hydroxypropyl)-3-methyl-8-(3-(trifluoromethoxy)phenoxy)-1H-purine-2,6(3H,7H)-dione (0.15 g, 79% yield) as a white solid. LCMS retention time=4.280 minutes and 97% purity, LCMS MH+ 525. 1H NMR (DMSO-d6) δ 7.59 (t, 1H, J=8 Hz), 7.46-7.48 (m, 1H), 7.38-7.43 (m, 5H), 7.31 (d, 1H, J=8 Hz), 5.43 (s, 2H), 4.65 (d, 1H, J=8 Hz), 3.90-3.95 (m, 2H), 3.68-3.74 (m, 1H), 3.28 (s, 3H), 1.02 (d, 3H, J=8 Hz).

1. customThe reaction solvent was removed under reduced pressure
2. additiondiluted with water (100 mL)
3. extractionextracted with ethyl acetate (3×75 mL)
4. dry with materialThe combined extracts were dried with magnesium sulfate
5. filtrationfiltered
6. customevaporated under reduced pressure to a light golden solid
7. customSolid was purified
8. washeluted with 1% methanol/DCM