Acetone → 1-ethyl-2,2-dimethyl-6-(pyridin-4-yl)-2,3-dihydrothieno[3,2-d]pyrimidin-4(1H)-one

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Reaction Conditions

Reaction Steps

A mixture of 3-(ethylamino)-5-(pyridin-4-yl)thiophene-2-carboxamide (0.100 g, 0.400 mmol), acetone (3.0 mL), p-toluenesulfonic acid monohydrate (0.0095 g, 0.050 mmol) and acetic acid (2.0 mL) was stirred overnight at 70° C. in a sealed tube. The mixture was poured into sat. aqueous sodium hydrogen carbonate (100 mL). Extraction with ethyl acetate-tetrahydrofuran (2:1, 100 mL), drying over magnesium sulfate, filtration and concentration at reduced pressure gave an oil. The oil was purified by column chromatography (Combiflash, 12 g silica gel, hexane to ethyl acetate) to afford the title compound (0.0898 g, 63%) as a yellow solid:

Provenance & Evidence