反应详情

To a mixture of 5-(4-nitrobenzylidene)-1,3-thiazolidine-2,4-dione (3.50 g) and N,N-dimethylformamide (100 mL) was added sodium hydride (60% in oil, 0.62 g) at room temperature. The reaction mixture was stirred at room temperature for 30 min. and iodoethane (6.55 g) was added to the reaction mixture. The mixture was stirred at room temperature for 15 hrs. Water was added to the reaction mixture and the precipitated crystals were collected by filtration to give 3-ethyl-5-(4-nitrobenzylidene)-1,3-thiazolidine-2,4-dione as yellow crystals (3.81 g, yield 98%). Recrystallization thereof from acetone-hexane gave yellow prism crystals. melting point: 217-218° C.

1. stirringThe mixture was stirred at room temperature for 15 hrs
2. filtrationthe precipitated crystals were collected by filtration