反应详情

A mixture of 2,2,2-trifluoroethylisothiocyanate (13.8 g.) and 3-amino-1-(2-hydroxyethyl)pyrazole (12.5 g.) in acetonitrile dried over 4A molecular sieve (30 ml.) was stirred at room temperature for 4 hours. A precipitate formed after 30 minutes. Filtration gave 1-(2-hydroxyethyl)-3-[3-(2,2,2-trifluoroethyl)thioureido]pyrazole (12.1 g.; 46%), m.p. 145°-146°.

1. dry with materialdried over 4A molecular sieve (30 ml.)
2. customA precipitate formed after 30 minutes
3. filtrationFiltration