反应详情

5-(1-Phenyl-1,2,3,4-tetrazol-5-yl)valeric acid (2.5 g) is dissolved in dimethylformamide (50 ml), and thereto is added triethylamine (1.1 g). To the mixture is added dropwise with stirring isobutyl chloroformate (1.5 g) under ice-cooling, and the mixture is stirred at room temperature for 30 minutes. To the mixture is added dropwise with stirring diethylamine (0.9 g) at room temperature, and the mixture is stirred for 2 hours. After distilling off dimethylformamide under reduced pressure, acetone is added to the resulting residue, and the insoluble materials are filtered off. The mother liquor is concentrated and then purified by column chromatography (Kieselgel 60, made by Merck & Co.). By eluting with chloroform, there is obtained N,N-diethyl-5-(1-phenyl-1,2,3,4-tetrazol-5-yl)valeramide (1.2 g), colorless liquid, nD25 =1.5303.

1. temperaturecooling
2. stirringthe mixture is stirred for 2 hours
3. distillationAfter distilling off dimethylformamide under reduced pressure, acetone
4. additionis added to the resulting residue
5. filtrationthe insoluble materials are filtered off
6. concentrationThe mother liquor is concentrated
7. custompurified by column chromatography (Kieselgel 60, made by Merck & Co.)
8. washBy eluting with chloroform