反应详情

To a solution of L-tartaric acid diethyl ester (2.0 g) in ethyl acetate (34.2 ml), 1,3-dibromo-5,5-dimethylhydantoin (3.3 g) was added, and the reaction solution was stirred at room temperature for 3 hours. To the reaction solution, acetic acid (17 ml) was added, and subsequently 36% aqueous formaldehyde solution (3.45 ml) was added under ice cooling at the internal temperature of 10° C. or below, followed by addition of ammonium acetate (17.2 g) at an internal temperature of 10° C. or below. The reaction solution was stirred at room temperature for 30 minutes, followed by stirring at 50° C. for 3 hours. To the reaction solution, 5N sodium hydroxide was added, and the aqueous layer was extracted with ethyl acetate. The organic layers were combined, and dried over magnesium sulfate. Quantitative analysis of the resulting ethyl acetate solution by HPLC showed that the title compound was not produced. The condition for HPLC analysis was identical with that for Example 5.

1. stirringThe reaction solution was stirred at room temperature for 30 minutes
2. stirringby stirring at 50° C. for 3 hours
3. extractionthe aqueous layer was extracted with ethyl acetate
4. dry with materialdried over magnesium sulfate
5. customwas not produced