反应详情

To a stirred solution of 6-(1-aminoethyl)-N-(3,4,5-trimethoxyphenyl)-1,2,4-triazin-3-amine (Intermediate 9) (1.0 g, 3.3 mmol) in N,N-dimethylformamide (10 mL) was added 3-bromobenzoic acid (0.72 g, 3.6 mmol), O-(7-azabenzotriazol-1-yl-N,N,N′N′-tetramethyluronium hexafluorophospahte (1.4 g, 3.6 mmol) and triethylamine (1.0 mL, 7.2 mmol). After stirring for 18 hours the solution was diluted with ethyl acetate (100 mL) and washed with 0.1 N HCl (2×100 mL) and saturated sodium bicarbonate solution (100 mL). The solution was dried with magnesium sulfate and filtered, and silica gel (5 g) was added to the solution, followed by evaporation of the volatiles under reduced pressure. The pre-adsorbed solids were loaded into a solid loading cartridge and subjected to a gradient elution using ethyl acetate:hexane (20:80) to ethyl acetate:hexanes (100:0) using a RediSep silica gel cartridge (40 g; ISCO). The appropriate fractions were combined and concentrated under reduced pressure to give 3-bromo-N-(1-{3-[(3,4,5-trimethoxyphenyl)amino]-1,2,4-triazin-6-yl}ethyl)benzamide (1.2 g) as a white solid. 1H NMR (CDCl3): δ9.94(s, 1H), 9.05 (d, J=7.2 Hz, 1H), 8.53 (s, 1H), 8.10 (s, 1H), 7.89 (d, J=7.9 Hz, 1H), 7.73 (d, J=7.9 Hz, 1H), 7.43 (dd, J=8.0, 7.8 Hz, 1H), 7.19 (s, 2H), 5.29 (dd, J=7.2, 7.0 Hz, 1H), 3.75 (s, 6H), 3.61 (s, 3H), 1.59 (d, J=7.0 Hz, 3H). MS m/z 488, 500 (M+1, M+3).

1. washwashed with 0.1 N HCl (2×100 mL) and saturated sodium bicarbonate solution (100 mL)
2. dry with materialThe solution was dried with magnesium sulfate
3. filtrationfiltered
4. additionsilica gel (5 g) was added to the solution
5. customfollowed by evaporation of the volatiles under reduced pressure
6. washsubjected to a gradient elution
7. concentrationconcentrated under reduced pressure