反应详情

温度

90 °C

A mixture of 3-amino-5-(pyridin-4-yl)thiophene-2-carboxamide (0.078 g, 0.36 mmol), tetrahydro-4H-pyran-4-one (0.200 g, 2.00 mmol), p-toluenesulfonic acid monohydrate (0.076 g, 0.40 mmol) and toluene (3.0 mL) was stirred for 2 h at 90° C. The mixture was poured into aqueous sodium hydrogen carbonate (50 mL). Extraction with ethyl acetate/tetrahydrofuran (2:1, 2×30 mL), drying over magnesium sulfate, filtration and concentration at reduced pressure gave an oil. The oil was purified by column chromatography (12 g, silica, Combiflash, dichloromethane to 80:20 dichloromethane/methanol) to afford the title compound (0.050 g, 46%) as a yellow solid:

1. extractionExtraction with ethyl acetate/tetrahydrofuran (2:1, 2×30 mL)
2. dry with materialdrying over magnesium sulfate, filtration and concentration at reduced pressure
3. customgave an oil
4. customThe oil was purified by column chromatography (12 g, silica, Combiflash, dichloromethane to 80:20 dichloromethane/methanol)