反应详情

To a solution of 2-methoxyisonicotinic acid (0.25 g, 1.01 mmol) in anhydrous tetrahydrofuran (10 mL) was added 4-methyl morpholine (0.15 g, 1.45 mmol), followed by the dropwise addition of isobutylchloroformate (0.19 g, 1.36 mmol) at 0° C. The reaction mixture was stirred at ambient temperature for 6 hours. Then a solution of 2-amino-N-benzyl-4-methylthiazole-5-carboxamide in tetrahydrofuran (10 mL) was added to it. The reaction mixture was stirred at ambient temperature for another 6 hours. The solvent was removed in vacuo. The residue was dissolved in ethyl acetate (50 mL) and washed with diluted hydrochloric acid solution (10 mL), saturated sodium bicarbonate solution (10 mL) and brine (10 mL). The organic layer was dried over anhydrous sodium sulfate, filtered and the filtrate was concentrated in vacuo. The residue was recrystallized from ethyl acetate and hexane to yield the title compound as a colorless solid in 83% yield (0.32 g); m.p. 188-190° C.; 1H NMR (CDCl3, 300 MHz) δ 8.32 (d, J=5.3 Hz, 1H), 7.37-7.25 (m, 7H), 7.17 (s, 1H), 5.99 (t, J=5.0 Hz, 1H), 4.59 (d, J=5.6 Hz, 2H), 3.96 (s, 3H), 2.55 (s, 3H); 1H NMR (CDCl3, 75 MHz) δ 164.9, 163.7, 161.9, 157.1, 151.3, 148.4, 141.5, 137.6, 128.8, 127.8, 127.8, 119.4, 113.8, 109.4, 54.0, 44.2, 16.7; MS (ES+) m/z 383.5 (M+1).

1. stirringThe reaction mixture was stirred at ambient temperature for another 6 hours
2. customThe solvent was removed in vacuo
3. dissolutionThe residue was dissolved in ethyl acetate (50 mL)
4. washwashed with diluted hydrochloric acid solution (10 mL), saturated sodium bicarbonate solution (10 mL) and brine (10 mL)
5. dry with materialThe organic layer was dried over anhydrous sodium sulfate
6. filtrationfiltered
7. concentrationthe filtrate was concentrated in vacuo
8. customThe residue was recrystallized from ethyl acetate and hexane