反应详情

TBTU (1.28 g; 3.98 mmol; 1.3 eq.) was added to a cooled (0° C.) solution of 4-azidobenzoic acid (500 mg; 3.06 mmol; 1.0 eq.) and DIEA (1.2 mL; 7.05 mmol; 2.3 eq.) in DMF (10 mL). After 15 min, morpholine (324 μl; 3.68 mmol; 1.2 eq.) was added and the reaction mixture was stirred at RT for 3 hours. The reaction mixture was diluted with EtOAc and washed twice with an aqueous saturated solution of NaHCO3 then with brine. The organic layer was dried over magnesium sulfate, filtered and concentrated to afford the title compound as a beige solid (710 mg, 100%). 1H NMR (300 MHz, DMSO-d6) δ 7.46 (d, J=8.6 Hz, 2H), 7.18 (d, J=8.6 Hz, 2H), 3.59-3.47 (m, 8H). HPLC (Condition A): Rt 2.21 min (purity 98.2%).

1. washwashed twice with an aqueous saturated solution of NaHCO3
2. dry with materialThe organic layer was dried over magnesium sulfate
3. filtrationfiltered
4. concentrationconcentrated