Methyl iodide → 3-Ethoxycarbonyl-2-methylthio-4-oxo-6,7,8-trifluoro-4H-1-benzothiopyran

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Reaction Steps

To a solution of 3.00 g (11.4 mmol) of ethyl 2,3,4,5-tetrafluorobenzoylacetate, 870 mg (11.4 mmol) of carbon disulfide and 9 ml of dried dimethyl sulfoxide were added 2.31 g (22.8 mmol) of triethylamine at room temperature, and the mixture was stirred for 1 hour at room temperature. Then, at room temperature, 3.24 g (22.8 mmol) of methyl iodide were added and the mixture was stirred for 2 hours, which was poured into ice-water. The crystals deposited were collected by filtration and dried to obtain 2.81 g (8.41 mmol) of title compound (yield 74%.

Provenance & Evidence