反应详情

tert-Butyl-N-[3-(2-aminoethyl)benzyl]-N-methylcarbamate (preparation 15) (0.5 g, 1.89 mmol), benzyl-2-[3,5-dichloro-2-methyl-6-oxo-1(6H)-pyrazinyl]acetate (preparation 17) (0.6 g, 1.83 mmol) and triethylamine (0.5 ml, 3.66 mmol) in ethyl acetate (30 ml) were stirred at reflux for 24 hr. The resultant mixture was diluted with ethyl acetate (20 ml) and washed with water, sat aq brine, dried over MgSO4. Removal of the drying agent by filtration followed by evaporation of the solvent gave a red oil which was purified by chromatography (SiO2, gradient elution with 100% CH2Cl2; 99:1 CH2Cl2:MeOH; 98:2 CH2Cl2:MeOH) to give the desired product (0.76 g, 75%). 1H NMR (CDCl3) δ 1.45 (s, 9H), 2.20 (s, 3H), 2.80 (s, br, 3H), 2.90 (t, 2H), 3.70 (m, 2H), 4.20 (s, br, 2H), 4.80 (s, 2H), 5.20 (s, 2H), 6.10 (m, br, 1H), 7.10 (m, 3H), 7.25 (m, 1H), 7.35 (m, 5H). LRMS m/z=555.3 (M+1)+. Found C, 62.50, H, 6.34, N, 9.98%; C29H35N4O5Cl requires C, 62.75, H, 6.36, N, 10.09%.

1. temperatureat reflux for 24 hr
2. washwashed with water
3. dry with materialdried over MgSO4
4. customRemoval of the drying agent
5. filtrationby filtration
6. customfollowed by evaporation of the solvent
7. customgave a red oil which
8. customwas purified by chromatography (SiO2, gradient elution with 100% CH2Cl2; 99:1 CH2Cl2:MeOH; 98:2 CH2Cl2:MeOH)