反应详情

5-{4-[2-(5-ethylpyridin-2-yl)ethoxy]benzyl}-1,3-thiazolidine-2,4-dione hydrochloride (100 mg) in MeOH (2 mL) was stirred for 5 min. using brief sonication to give a clear solution. L-tartaric acid (38 mg, 1 eq) was added followed by dropwise addition of water until a haziness persisted (up to 2 mL used). The reaction was stirred in closed vial for 96 h, the precipitated solid was collected on a filter cup and washed with H2O-MeOH (2:1, 3 ml) and then dried under vacuum (42 mg). (Method 13) 48.30%, Rt 9.62 min.; 51.60%, Rt 14.30 min.; d.e. 3.3%. 1H NMR (400 MHz, DMSO-d6): δ 8.34-8.29 (1H, d, J 1.9), 7.55-7.49 (1H, dd, J 2.2, 7.9), 7.24-7.20 (1H, d, J 7.8), 7.12-7.05 (2H, d, J 8.6), 6.84-6.77 (2H, d, J 8.6), 4.78-4.71 (1H, dd, J 4.3, 9.1), 4.30-4.19 (1H, d, J 4.3), 3.24-3.18 (2H, d), 3.11-3.03 (2H, t, J 6.6), 3.00-2.92 (1H, dd, J 9.2, 14.2), 2.59-2.50 (2H, q, J 7.6), 1.17-1.09 (3H, t, J 7.7).

1. customsonication
2. customto give a clear solution
3. customthe precipitated solid was collected on a filter cup
4. washwashed with H2O-MeOH (2:1, 3 ml)
5. customdried under vacuum (42 mg)