反应详情

To a solution of (R)-1-[4-(4-oxazolo[5,4-c]pyridin-2-yl-piperazin-1-yl)-pyrimidin-2-yl]-ethyl butyrate (prepared according to the method of Example 2, Step A, 1.2 g, 3.0 mmol) in methanol (30 mL) was added potassium carbonate (823 mg, 6.0 mmol). This mixture was stirred at room temperature for 5 h, diluted with saturated aqueous ammonium chloride, concentrated, and extracted with chloroform (3×). The combined organic extracts were dried over sodium sulfate, filtered, evaporated, and purified by flash column chromatography (6% methanol/chloroform) to give 915 mg (94%) of the title compound as a white solid after tritration with hexanes. mp: 181-183° C.; 1H NMR (CDCl3, 300 MHz) δ 8.54 (d, 1H), 8.35 (d, 1H), 8.25 (d, 1H), 7.27 (dd, 1H), 6.44 (d, 1H), 4.71 (q, 1H), 4.25 (br s, 1H), 3.86-3.83 (c, 8H), 1.50 (d, 3H); MS (APCI) 327 (MH+); [α]D+15.3 (c 0.5, MeOH).

1. concentrationconcentrated
2. extractionextracted with chloroform (3×)
3. dry with materialThe combined organic extracts were dried over sodium sulfate
4. filtrationfiltered
5. customevaporated
6. custompurified by flash column chromatography (6% methanol/chloroform)