反应详情

To a solution of quinoxalin-6-yl-acetic acid ethyl ester (95 mg, 0.44 mmol) in methanol (2 mL) was added 4 M aqueous lithium hydroxide (0.55 mL, 2.2 mmol). The reaction mixture was stirred at room temperature for 17 h then it was concentrated in vacuo, diluted with water and extracted with diethyl ether (3×). The aqueous layer was treated with 1 N aqueous hydrochloric acid until pH 2 and extracted with ethyl acetate (3×). The combined organic layers were dried over sodium sulfate, filtered, and concentrated in vacuo to provide 64 mg of product as a beige solid. 1H NMR 500 MHz (DMSO) δ 3.90 (s, 2H), 7.78 (dd, 1H), 7.99 (d, 1H), 8.06 (d, 1H), 8.93 (dd, 2H); MS (m/z) 189 [M+H+]+.

1. concentrationit was concentrated in vacuo
2. additiondiluted with water
3. extractionextracted with diethyl ether (3×)
4. additionThe aqueous layer was treated with 1 N aqueous hydrochloric acid until pH 2
5. extractionextracted with ethyl acetate (3×)
6. dry with materialThe combined organic layers were dried over sodium sulfate
7. filtrationfiltered
8. concentrationconcentrated in vacuo