反应详情

4-(1-Methyl-1,2,3,4-tetrazol-5-yl)thio-butyric acid (45 mmole) is dissolved in tetrahydrofuran (50 ml), and thereto is added DBU (50 mmole). To the mixture is added dropwise with stirring isobutyl chloroformate (50 mmole) under ice-cooling and the mixture is stirred at room temperature for 30 minutes. To the mixture is added dropwise 2-(3,4-dimethoxyphenyl)ethylamine (54 mmole) and the mixture is further stirred at room temperature for 2 hours. After the solvent is distilled off under reduced pressure, the resulting residue is extracted with chloroform. The chloroform layer is washed with 5% aqueous hydrochloric acid, an aqueous saturated sodium hydrogen carbonate solution and an aqueous saturated sodium chloride solution and dried over anhydrous sodium sulfate. After distilling off chloroform, the residue is subjected to column chromatography (Wakogel C-200, eluting agent, chloroform) to isolate N-[2-(3,4-dimethoxyphenyl)ethyl]-4-(1-methyl-1,2,3,4-tetrazol-5-yl)thio-butyramide (yield: 41%) which is recrystallized from hexane-chloroform, colorless flaks, m.p. 70.5°-71.5° C.

1. temperaturecooling
2. stirringthe mixture is further stirred at room temperature for 2 hours
3. distillationAfter the solvent is distilled off under reduced pressure
4. extractionthe resulting residue is extracted with chloroform
5. washThe chloroform layer is washed with 5% aqueous hydrochloric acid
6. dry with materialan aqueous saturated sodium hydrogen carbonate solution and an aqueous saturated sodium chloride solution and dried over anhydrous sodium sulfate
7. distillationAfter distilling off chloroform
8. washthe residue is subjected to column chromatography (Wakogel C-200, eluting agent, chloroform)