Sodium Hydroxide → HCID 19789276, compound

Participants

Reaction Conditions

Reaction Steps

3.8 g of 1-methylpyrazole-4-carboxylic acid and 4.9 g of carbonyldiimidazole in 100 ml of 1,2-dichloroethane are heated at 55° C. for 3.5 h. 4.9 g of 2-thienylsulfonamide and 5.4 ml of triethylamine are added and then the mixture is heated at 55° C. for 13 h. After cooling, 40 ml of 10% strength aqueous NaOH solution are added and then the pH of the aqueous phase is adjusted to 1. The precipitate is removed and dried under reduced pressure. 5.2 g of N-(2-thienylsulfonyl)-1-methylpyrazole-4-carboxamide with a melting point of 174°-180° C. are obtained (active ingredient Example No. 103).

Provenance & Evidence