反应详情

To a suspension of N-(4-cyano-1,2,5-oxadiazol-3-yl)-2,2,2-trifluoroacetamide (0.10 g, 0.49 mmol) in 2 mL of TFA was added thiosemicarbazide (0.044 g, 0.49 mmol). The reaction mixture was poured into ice and neutralized with sat. NaHCO3 to pH=7. The aqueous layer was extracted with ethyl acetate (2×50 mL). The combined organic layer was washed with NaCl and concentrated. Trituration with diethyl ether afforded the title compound as a beige solid (0.070 g, 51%). 1H NMR (DMSO, 500 MHz) δ 7.93 (s, 2H), 6.55 (s, 1H). Mass Spec. FIA MS 281.1(M+1).

1. extractionThe aqueous layer was extracted with ethyl acetate (2×50 mL)
2. washThe combined organic layer was washed with NaCl
3. concentrationconcentrated