反应详情

温度

-1 °C

A solution of 110.6 g (0.475 mol, 95% assay) of 3-[1-(methylthio)ethyl]-6-(trifluoromethyl)pyridine and 25.2 g (0.6 mol) of cyanamide in 600 mL of acetonitrile was cooled to −5° C. To this solution was added 750 g (0.575 mol, Clorox™ 5.7% wt) of aqueous NaOCl dropwise over 45 min with the temperature kept below 0° C. The reaction mixture was allowed to stir at −1° C. for 30 min. To the mixture was added 9.5 g (0.05 mol) of sodium metabisulfite in 25 mL of water and the two phase mixture was allowed to settle. The aqueous phase was reextracted 2×'s with 50 mL of acetonitrile. The organics were combined and this acetonitrile/sulfilimine solution was used directly in the following oxidation. LC analysis indicated a 40:54 (area) ratio of two isomers.

1. customkept below 0° C