反应详情

1-(3-Aminopropyl)-7-(4-chlorobenzyl)-3-methyl-8-(3-(trifluoromethoxy)phenoxy)-1H-purine-2,6(3H,7H)-dione (0.10 g, 0.19 mmol, example 357) and TEA (0.80 mL, 0.57 mmol) were combined in THF (1 mL). Acetyl chloride (0.28 mL, 0.42 mmol) was added and the reaction was stirred at room temperature for 4 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 an oil. The oil was purified using a 2000 micron preparative TLC plate eluted with 5% methanol/DCM. Target band was scraped off plate and eluted off silica gel with eluent to give N-(3-(7-(4-chlorobenzyl)-3-methyl-2,6-dioxo-8-(3-(trifluoromethoxy)phenoxy)-2,3,6,7-tetrahydro-1H-purin-1-yl)propyl)acetamide (0.053 g, 49% yield) as a light tan solid. LCMS retention time=3.789 minutes and 99% purity, LCMS MH+ 566. 1H NMR (DMSO-d6) δ 7.78-7.82 (m, 1H), 7.59 (t, 1H, J=8 Hz), 7.44-7.48 (m, 1H), 7.38-7.42 (m, 5H), 7.31 (d, 1H, J=8 Hz), 5.42 (s, 2H), 3.87 (t, 2H, J=8 Hz), 3.28 (s, 3H), 2.04 (dd, 2H, J=4 Hz and 12 Hz), 1.78 (s, 3H), 1.61-1.70 (m, 2H).

1. extractionextracted with ethyl acetate (3×75 mL)
2. dry with materialThe combined extracts were dried with magnesium sulfate
3. filtrationfiltered
4. customevaporated under reduced pressure to an oil
5. customThe oil was purified
6. washeluted with 5% methanol/DCM
7. washeluted off silica gel with eluent