反应详情

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To a mixture of (5Z)-5-[(3-benzyloxy-1-phenyl-1H-pyrazol-4-yl)methylene]-1,3-thiazolidine-2,4-dione (1.30 g) and N,N-dimethylformamide (5 mL) was added sodium hydride (60% in oil, 0.15 g) at 0° C. After stirring the reaction mixture at 0° C. for 30 min, methyl iodide (0.58 g) was added to the reaction mixture, and the mixture was further stirred at room temperature for 4 hrs. The reaction mixture was poured into water, and the precipitated crystals were collected by filtration to give (5Z)-5-[(3-benzyloxy-1-phenyl-1H-pyrazol-4-yl)methylene]-3-methyl-1,3-thiazolidine-2,4-dione as yellow crystals (1.30 g, yield 98%). Recrystallization from tetrahydrofuran-hexane gave yellow prism crystals. melting point: 226-227° C.

1. stirringthe mixture was further stirred at room temperature for 4 hrs
2. filtrationthe precipitated crystals were collected by filtration