反应详情

To a suspension of sodium borohydride (1.2 g) in tetrahydrofuran (10 ml), a solution of 2',5-dichloro-2-methylaminobenzophenone (3.12 g) in tetrahydrofuran (20 ml) is added dropwise. The resultant mixture is mixed with water (5 ml) and stirred at room temperature overnight. The reaction mixture is mixed with a small amount of water and evaporated under reduced pressure to remove the solvent. The residue is made to pH 8-9 with dilute hydrochloric acid and shaken with chloroform. The organic layer is dried and evaporated to give 2', 5-dichloro-2-methylaminobenzhydrol (3.05 g). This substance is recrystallized from ether/n-hexane to give crystals melting at 105.5° to 106.5° C. The yield is 97.1%.

1. customevaporated under reduced pressure
2. customto remove the solvent
3. stirringshaken with chloroform
4. customThe organic layer is dried
5. customevaporated