反应详情

温度

0 °C

DBU (79.2 mg, 78 μL, 0.520 mmol) was added to a solution of 2-cyanoethyl 1-{[(α-benzoyloxybenzyloxy)carbonyl]aminomethyl}-1-cyclohexane acetate (11) (166 mg, 0.347 mmol) in 10 mL of CH2Cl2 at −10° C. The reaction mixture was stirred at 0° C. for 1 hour, then allowed to warm to room temperature, stirred for two hours and cooled to 0° C. Another 78 μL of DBU was added, the reaction mixture was stirred for 3 hours at 0° C. and then allowed to warm to room temperature. The reaction mixture was diluted with CH2Cl2, washed with citric acid and brine and dried over Na2SO4. The solvent was removed under reduced pressure and the residue was purified by reversed phase HPLC to afford 7 mg (4.7%) of the title compound. M.p. 75.5-76.0° C. 1H NMR (CDCl3): δ 8.08 (2H, dd, J=8.8, 1.2 Hz); 7.89 (1H, s); 7.63-7.55 (3H, m); 7.46-7.26 (5H, m); 5.38 (1H, t, J=6.8 Hz); 3.26 (2H, dd, J=6.8, 0.8 Hz); 2.34 (2H, s); 1.58-1.35 (10 H, m). MS (ESI) m/z 424 (M−H−).

1. temperatureto warm to room temperature
2. stirringstirred for two hours
3. temperaturecooled to 0° C
4. stirringthe reaction mixture was stirred for 3 hours at 0° C.
5. temperatureto warm to room temperature
6. washwashed with citric acid and brine
7. dry with materialdried over Na2SO4
8. customThe solvent was removed under reduced pressure
9. customthe residue was purified by reversed phase HPLC