Pyridine → HCID 15483721, compound

Participants

Reaction Steps

1.0 Gram (2.7 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 10 ml of 1,2-dichloroethane, and further, 0.26 g (3.2 mmol) of pyridine, 0.57 g (3.2 mmol) of isonicotinic acid chloride hydrochloride and 10 mg of benzyltriethylammonium chloride were added. The mixture was allowed to react at room temperature for 3 hours. The extraction of the reaction mixture was carried out by adding ethyl acetate, and the extract was consecutively washed with 10% hydrochloric acid, with a saturated sodium bicarbonate aqueous solution and with a saturated sodium chloride aqueous solution. The solvent was removed by filtration under reduced pressure, and the resultant oily substance was washed with an ethyl acetate/n-hexane mixed solvent (1:1 (v/v)) to form a solid. The mixture was filtered to give 1.0 g (yield 80%) of 4,4,5,8-tetramethyl-6-(1,3-dimethyl-5-(pyridin-4-yl)carbonyloxypyrazol-4-yl) carbonylthiochroman-1,1-dioxide (Compound No. 42).

Provenance & Evidence