N-bromobutanimide → Methyl 4-hydroxythiophene-3-carboxylate

Participants

Reaction Conditions

Reaction Steps

1.6 parts of 3-hydroxy-dihydrothiophene-4-carboxylic acid methyl ester are introduced into 15 parts by volume of carbon tetrachloride and the mixture is cooled to 0° C. 1.78 parts of N-bromosuccinimide are added in portions over 30 minutes and the mixture is kept for one hour at 0° C. The end product is isolated from the reaction mixture analogously to Example 5c. 1.2 parts (76% of theory) of 3-hydroxythiophene-4-carboxylic acid methyl ester of melting point 40°-43° C. are obtained.

Provenance & Evidence