Hydrochloric Acid → HCID 19787178, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of ethyl 4-(2-chlorophenyl)-6,7-dihydro-2-ethyl-7-methyl-6-oxothieno[2,3-b]pyridine-5-carboxylate (1.10 g), KOH (0.49 g) and 80% ethanol (10 ml) was heated at 80° C. for 20 minutes and water was added. Then, the mixture was made acidic with 2N HCl and extracted with ethyl acetate. The extract was washed with water and dried over MgSO4, and then the solvent was distilled off. To the residue was added hexane to obtain 4-(2-chlorophenyl)-6,7-dihydro-2-ethyl-7-methyl-6-oxothieno[2,3-b]pyridine-5-carboxylic acid as crystals (0.91 g, 89.2%). The crystals were recrystallized from ethanol to obtain colorless prisms, mp: 155°-156° C.

Provenance & Evidence