反应详情

To a solution of (R)-1-[4-(1-methyl-3-oxo-2-quinoxalin-2-yl-1,2,3,4,6,7-hexahydro-pyrazolo[4,3-c]pyridin-5-yl)-pyrimidin-2-yl]-ethyl butyrate (prepared according to the method of Example 75, Step D, 248 mg, 0.52 mmol) in a 5:2 mixture of methanol/tetrahydrofuran (7 mL) was added potassium carbonate (218 mg, 1.57 mmol). This mixture was stirred at room temperature overnight and evaporated. The residue was diluted with saturated aqueous sodium bicarbonate and extracted with chloroform (3×). The combined organic extracts were dried over sodium sulfate, filtered, evaporated, and purified by flash column chromatography (1.5→3% methanol/chloroform) to give 150 mg (71%) of the title compound as a white solid. mp: 217-219° C. (dec); 1H NMR (CDCl3, 250 MHz) δ 9.66 (s, 1H), 8.25 (d, 1H), 8.12 (dd, 1H), 7.99 (m, 1H), 7.68-7.78 (c, 2H), 6.47 (d, 1H), 4.72 (q, 12H), 4.32 (s, 2H), 4.194.14 (c, 3H), 3.41 (s, 3H), 2.80 (t, 2H), 1.51 (d, 3H); MS (APCI) 404 (MH); [α]D+13.4 (c, 1.5, CHCl3).

1. customevaporated
2. additionThe residue was diluted with saturated aqueous sodium bicarbonate
3. extractionextracted with chloroform (3×)
4. dry with materialThe combined organic extracts were dried over sodium sulfate
5. filtrationfiltered
6. customevaporated
7. custompurified by flash column chromatography (1.5→3% methanol/chloroform)