Sulfuric Acid → 6-(4-Isopropyl-4-methyl-5-oxo-2-imidazolin-2-yl)thieno[2,3-b]pyridine-5-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

6-[(1-Carbamoyl-1,2-dimethylpropyl)carbamoyl]thieno[2,3-b]pyridine-5-carboxylic acid (17.35 g, 0.052 mol) is added to water (225 mL) containing sodium hydroxide (10.35 g, 0.26 mol). The resulting basic solution is heated at 80° C. for two hours and 45 minutes, cooled in an ice-water bath and acidified with 6N H2SO4. The product 6-(5-isopropyl-5-methyl-4-oxo-2-imidazolin-2-yl)thieno[2,3-b]pyridine-5-carboxylic acid is filtered off, washed with water and air dried yielding 1.54 g, 70.3%, mp 221°-223° C.

Provenance & Evidence