Phenyl isocyanate → Tert-butyl 4-phenylcarbamoyl-1-piperazinecarboxylate
Reaction equation
[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][NH:11][CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[C:14]1([N:20]=[C:21]=[O:22])[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1>ClCCl>[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][N:11]([C:21](=[O:22])[NH:20][C:14]2[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=2)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:2])[CH3:3]Participants
4
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Procedure
A solution of piperazine-1-carboxylic acid tert-butyl ester (114 g) in DCM (500 mL) was cooled in an ice bath and treated with phenyl isocyanate (65 mL). After 1 hour (h), the bath was removed. After 15 h, the resulting mixture was filtered and the solid was washed with dichloromethane (DCM, 2×100 mL), giving the title compound as a white amorphous solid (95 g).