Piperazine → HCID 14128502, compound
Reaction equation
Cl[CH2:2][CH2:3][CH2:4][O:5][C:6]1[CH:15]=[CH:14][CH:13]=[C:12]2[C:7]=1[CH2:8][CH2:9][C:10](=[O:16])[NH:11]2.[NH:17]1[CH2:22][CH2:21][NH:20][CH2:19][CH2:18]1.C([O-])(O)=O.[Na+]>>[N:17]1([CH2:2][CH2:3][CH2:4][O:5][C:6]2[CH:15]=[CH:14][CH:13]=[C:12]3[C:7]=2[CH2:8][CH2:9][C:10](=[O:16])[NH:11]3)[CH2:22][CH2:21][NH:20][CH2:19][CH2:18]1Participants
4
Procedure
(a)-1 3.0 grams of 5-(3-chloropropoxy)-3,4-dihydrocarbostyril and 10 g of piperazine are mixed with 20 ml of hexamethylphosphoryl triamide and heated at 80°-90° C. for 5 hours. The reaction mixture is distilled under a reduced pressure to remove hexamethylphosphoryl triamide and unreacted piperazine. To the residue thus obtained are added 30 ml of 5%-NaHCO3 aqueous solution, followed by extraction with chloroform. The chloroform layer is washed with water and chloroform is removed by distillation. The residue thus obtained is purified by silica-gel chromatography to obtain 1.8 g of 5-(3-piperazinylpropoxy)-3,4-dihydrocarbostyril having a melting point of 192°-195° C.