反应详情

Dissolve 2-chlorothiazole-5-carboxamide (0.771 g, 4.78 mmol) and 4-hydroxybenzaldehyde (0.584 g, 4.78 mmol) in DMF (15.9 mL). Add K2CO3 (1.651 g, 11.95 mmol) and heat at 100° C. for 2 hours. Concentrate the reaction mixture. Take the solid up in dichloromethane:methanol (5:1). Add ethyl acetate to precipitate out a white solid. Filter and collect the solid as the title compound: 1H NMR (DMSO): 10.00 (s, 1H), 8.11 (s, 1H), 8.02 (d, J=8.4 Hz, 2H), 7.94 (s, 1H), 7.59 (d, J=8.8 Hz, 2H), 7.41 (s, 1H); HPLC [YMC-Pro pack C-18 (150×4.6 mm, S-5 microm), 0.05% TFA/acetonitrile in 0.05% TFA/water at 1.0 mL/min, 10-20% over 5 min, 20-95% over 18], tR=11.4 min, 98.2% purity.

1. concentrationConcentrate the reaction mixture
2. customAdd ethyl acetate to precipitate out a white solid
3. filtrationFilter
4. customcollect the solid as the title compound
5. customHPLC [YMC-Pro pack C-18 (150×4.6 mm, S-5 microm), 0.05% TFA/acetonitrile in 0.05% TFA/water at 1.0 mL/min, 10-20% over 5 min, 20-95% over 18], tR=11.4 min, 98.2% purity