Potassium Carbonate → HCID 23450695, compound

Participants

Reaction Steps

2.7 Grams (7.1 mmol) of the 4,4,5,8-tetramethyl-6-(1,3-dimethyl-5-hydroxypyrazol-4-yl)carbonylthiochroman-1,1-dioxide obtained in Preparation Example 6 was dissolved in 20 ml of methylene chloride, and a solution of 1.5 g of potassium carbonate in 20 ml of methylene chloride was added. Further, 0.76 g (10.5 mmol) of n-propanesulfonyl chloride was dissolved in 10 ml of methylene chloride, and the resultant solution was added. Then, 50 mg of benzyltriethylammonium chloride was added. The mixture was allowed to react at room temperature for 7 hours, and then a methylene chloride layer was separated. The methylene chloride layer was dried over sodium sulfate, and then the solvent was distilled off under reduced pressure. When the resultant oily substance was washed with an ethyl acetate/n-hexane mixed solvent (1:2 (V/V)) to form a solid, and the mixture was filtered to give 1.26 g(yield 74%) of 4,4,5,8-tetramethyl-6-(1,3-dimethyl-5-n-propanesulfonyloxypyrazol-4-yl)carbonylthiochroman-1,1-dioxide (Compound No. 30).

Provenance & Evidence