Hydrochloric Acid → 2-Butyl-4-thiazolecarboxylic acid

Participants

Reaction Steps

Lithium hydroxide (5.00 g) was added to a stirred mixture of ethyl 2-butylthiazole-4-carboxylate (example 78, step f) (6.50 g) in THF (80 mL) and water (20 mL). After 16 h, concentrated hydrochloric acid (10 mL) was added and the solution concentrated to ˜40 mL. The reaction mixture was partitioned between ethyl acetate and brine. The aqueous layer was extracted three times with ethyl acetate. The combined organic layers were dried over magnesium sulphate, filtered and evaporated in vacuo to give the subtitled compound as an off white solid. Yield 4.6 g.

Provenance & Evidence