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7-(4-Chlorobenzyl)-3-methyl-1-(2-oxopropyl)-8-(3-(trifluoromethoxy)phenoxy)-1H-purine-2,6(3H,7H)-dione (0.25 g, 0.48 mmol, example 348) was dissolved in THF (6 mL), cooled to 0° C. and 2.0 M propyl magnesium bromide in THF (0.36 mL, 0.72 mmol) was added drop wise. The reaction was stirred in the cold for 15 min then warmed to room temperature and stirred 1 h. The reaction was 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 golden oil. The oil was purified using a 25 g silica gel flash column eluted with 20% ethyl acetate/hexanes to give 7-(4-chlorobenzyl)-1-(2-hydroxy-2-methylpentyl)-3-methyl-8-(3-(trifluoromethoxy)phenoxy)-1H-purine-2,6(3H,7H)-dione (0.88 g, 32% yield) as a clear oil. LCMS retention time=4.792 minutes and 98% purity, LCMS MH+=567. 1H NMR (DMSO-d6) δ 7.59 (t, 1H, J=8 Hz), 7.47-7.50 (m, 1H), 7.38-7.44 (m, 5H), 7.31 (d, 1H, J=8 Hz), 5.42 (s, 2H), 4.23 (s, 1H) 3.92-4.02 (dd, 2H, J=4 Hz and 16 Hz), 3.29 (s, 3H), 1.30-1.41 (m, 4H), 0.99 (s, 3H), 0.80 (t, 3H, J=8 Hz).

1. temperaturethen warmed to room temperature
2. stirringstirred 1 h
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 golden oil
7. customThe oil was purified
8. washeluted with 20% ethyl acetate/hexanes