反应详情

To a solution of (R)-1-[4-(4-oxazolo[5,4-b]pyridin-2-yl-piperazin-1-yl)-pyrimidin-2-yl]-ethyl butyrate (prepared according to the method of Example 9, Step B, 11.0 g, 27.6 mmol) in dioxane (11.5 mL) was added concentrated hydrochloric acid (23 mL, 276 mmol). This mixture was stirred at room temperature overnight, neutralized with 6 N aqueous sodium hydroxide, and extracted with chloroform (3×). The combined organic extracts were dried over sodium sulfate, filtered, evaporated, and purified by flash column chromatography (3.5% methanol/chloroform) to give 8.4 g (93%) of the title compound as a white solid. mp: 153-156° C.; 1H NMR (CDCl3, 300 MHz) δ 8.25 (d, 1H), 7.95 (dd, 1H), 7.58 (dd, 1H), 7.15 (dd, 1H), 6.45 (d, 1H), 4.72 (q, 1H), 4.25 (br s, 1H), 3.85-3.82 (c, 8H), 1.51 (d, 3H); MS (CI/NH3) 327 (MH+); [α]D+16.1 (c 1.0, MeOH).

1. extractionextracted with chloroform (3×)
2. dry with materialThe combined organic extracts were dried over sodium sulfate
3. filtrationfiltered
4. customevaporated
5. custompurified by flash column chromatography (3.5% methanol/chloroform)