反应详情

A mixture of 2-amino-4-methylthiazole-5-carboxylic acid benzylamide (0.20 g, 0.81 mmol), benzaldehyde (0.086 g, 0.81 mmol) and titanium(IV) isopropoxide (0.29 g, 1.01 mmol) in anhydrous tetrahydrofuran (2 mL) was stirred at ambient temperature for 18 h. Sodium cyanoborohydride (0.036 g, 0.57 mmol) was added to the mixture and stirring was continued at ambient temperature for another 6 h. The reaction was quenched with the addition of water (2 mL). The precipitate obtained was filtered and washed with ethanol. The filtrate was concentrated in vacuo. The residue was purified by column chromatography to obtain the title compound as a white solid in 58% yield (0.16 g); m.p. 169-172° C.; 1H NMR (CDCl3, 300 MHz) δ 7.37-7.23 (m, 10H), 6.02 (s, 1H), 5.69 (s, 1H), 4.54 (d, J=5.6 Hz, 2H), 4.43 (s, 2H), 2.49 (s, 3H); MS (ES+) m/z 338.3 (M+1).

1. stirringstirring
2. waitwas continued at ambient temperature for another 6 h
3. customThe reaction was quenched with the addition of water (2 mL)
4. customThe precipitate obtained
5. filtrationwas filtered
6. washwashed with ethanol
7. concentrationThe filtrate was concentrated in vacuo
8. customThe residue was purified by column chromatography