反应详情

温度

50 °C

A mixture of 55.4 g (0.57 moles) of potassium thiocyanate, 1 g of 18-crown-6 cyclic ether, 80.5 g (0.38 moles) of 2,2,2-trichloroethyl chloroformate and 300 ml of toluene was heated for 3 hours at 50° C. to prepare the acyl isothiocyanate. The mixture was filtered and 74 g (0.38 moles) of 2-cyanoethyl trans-3-diethylaminoacrylate were added dropwise over one hour. After 24 hours at room temperature, the mixture was filtered to give 108 g of crude material which was recrystallized from toluene to give 63 g of pure adduct, melting point 116° to 118° C.

1. filtrationThe mixture was filtered
2. filtrationthe mixture was filtered
3. customto give 108 g of crude material which
4. customwas recrystallized from toluene