Phenyl isocyanate → Forchlorfenuron
반응식
[Cl:1][C:2]1[CH:7]=[C:6]([NH2:8])[CH:5]=[CH:4][N:3]=1.[C:9]1([N:15]=[C:16]=[O:17])[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=1>CC(C)=O>[Cl:1][C:2]1[CH:7]=[C:6]([NH:8][C:16]([NH:15][C:9]2[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=2)=[O:17])[CH:5]=[CH:4][N:3]=1참가 물질
4
실험 절차
To a solution of 257 mg. (2 mmol) of 2-chloro-4-aminopyridine dissolved in ten ml. of dry acetone, 238 mg. (2 mmol) of phenyl isocyanate is added and the mixture is stirred at room temperature for 8 hrs. The solvent is evaporated under a reduced pressure, the residue is chromatographed over alumina, and the column is developed with chloroform. Eluates containing the objective substance are collected, and the solvent is evaporated under a reduced pressure. The residue is recrystallized from acetone-ether mixture and 364 mg. of N-(2-chloro-4-pyridyl)-N'-phenylurea is obtained. Yield, 73.5%, mp 173°-174° C.