反应详情

To a solution of 1-benzyl-4-((2-aminomethyl)phenylamino)piperidine (1.74 g, 5.90 mmol) from Step 3 in dry DMF (50 mL) was added 4-nitrophenyl chloroformate (1.25 g, 6.20 mmol) and DIEA (3.08 mL, 17.7 mmol). After the reaction had been stirred at ambient temperature for 24 h, the solvent was removed under reduced pressure. The residue was dissolved in DCM (100 mL) and washed with saturated aqueous NaHCO3 (4×50 mL), dried (MgSO4), and filtered. The solution was concetrated and the precipitate which formed was collected by filtration to give 1-(1-benzyl-4-piperidinyl)-3,4-dihydroquinazolin-2(1H)-one as a white solid (50% yield).

1. customthe solvent was removed under reduced pressure
2. dissolutionThe residue was dissolved in DCM (100 mL)
3. washwashed with saturated aqueous NaHCO3 (4×50 mL)
4. dry with materialdried (MgSO4)
5. filtrationfiltered
6. customthe precipitate which formed
7. filtrationwas collected by filtration