反应详情

To a solution cooled at -28° C. to -35° C. of 5-mercapto-1H-tetrazole-1-acetic acid (0.8 g) in tetrahydrofuran (40 ml) are added N-methylmorpholine (1.26 ml) and ethyl chloroformate (0.62 ml). After stirring for 1 hour, a solution of methoxyamine hydrochloride (0.34 g) and N-methylmorpholine (0.71 ml) in tetrahydrofuran (11 ml) is added to the mixture at -50° C. After 2 hours' stirring at about -30° C., the mixture is concentrated under reduced pressure, and the resultant mixture is diluted with water (50 ml) and ethyl acetate (50 ml). The mixture is acidified to pH 2 with hydrochloric acid and extracted with ethyl acetate. The extract solution is dried over magnesium sulfate and concentrated to give 5-mercapto-1H-tetrazole-1-acetohydroxamic acid methyl ester. mp. 165°-167° C. (decomp.).

1. stirringAfter 2 hours' stirring at about -30° C.
2. concentrationthe mixture is concentrated under reduced pressure
3. additionthe resultant mixture is diluted with water (50 ml) and ethyl acetate (50 ml)
4. extractionextracted with ethyl acetate
5. dry with materialThe extract solution is dried over magnesium sulfate
6. concentrationconcentrated