Methanol → Methyl 3-methyl-5-[4-(trifluoromethyl)phenyl]thiophene-2-carboxylate

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A mixture of 3-methyl-5[4-(trifluoromethyl)phenyl]thiophene-2-carboxylic acid (intermediate 130, 8.1 g) in methanol (300 ml) was heated at 30° C. and hydrogen chloride gas bubbled through the mixture. The reaction mixture was then stirred at reflux for 21 hours; cooled and treated with further hydrogen chloride gas. The reaction mixture was stirred at reflux for a further 6 hours, cooled and concentrated. The resulting precipitate was filtered and washed with cyclohexane to give the title compound as a solid.

Herkunft & Nachweise