反应详情

Dissolved in tetrahyrofuran were 6.6 g of t-butyoxycarbonyl-DL-threonine and 3.1 g of triethylamine, to which was added dropwise 3.3 g of ethyl chlorocarbonate at 0° C. After stirring for two hours, 3.1 g of 2-amino-1,3,4-thiadiazole was added, and stirred at room temperature for further 20 hours. The reaction solution was concentrated under a reduced pressure, water was added to the residue, and the precipitates were collected by filtration to obtain 7.2 g (Yield 80%) of 2-(t-butoxycarbonyl-DL-threonyl)amino-1,3,4-thiadiazole as white crystals having a melting point of from 165° to 172° C. (dec.).

1. stirringstirred at room temperature for further 20 hours
2. concentrationThe reaction solution was concentrated under a reduced pressure, water
3. additionwas added to the residue
4. filtrationthe precipitates were collected by filtration