Patent ID: 8669375

Claim:
A method for producing an ester compound having a heterocyclic group(s) which comprises: subjecting a carboxylic acid and an alcohol to a dehydration-condensation reaction with adding no solvent or with adding a nonaqueous solvent into a reaction system, in a presence of an involatile acid catalyst; then removing a residue of the acid catalyst without adding any solvent or in a nonaqueous solvent by bringing a weak basic substance into contact with the residual acid catalyst, forming a salt of the weak basic substance and the acid catalyst, and then filtering off the salt, wherein the carboxylic acid is a compound represented by a formula (2): R 2 —COOH (2), wherein R 2 represents an alkyl group having 1 to 18 carbon atoms, an oxygen-atom-containing alkyl group, an alkenyl group, an alkynyl group, an aryl group, an aralkyl group, or a heterocyclic group, which may have a substituent; and the alcohol is a compound represented by a formula (1): R 1 —OH (1), wherein R 1 represents an alkyl group having 1 to 18 carbon atoms, an oxygen-atom-containing alkyl group, an alkenyl group, an alkynyl group, an aryl group, an aralkyl group, or a heterocyclic group, which may have a substituent; and wherein the heterocyclic group represented by R 1 and R 2 is 5-membered ring or a 6-membered ring, which has 1 to 3 hetero atoms selected from the group consisting of a nitrogen atom, an oxygen atom and a sulfur atom, the substituent of the alkyl group, the alkenyl group, or the alkynyl group represented by R 1 and R 2 is selected from the group consisting of a halogen atom, a haloalkyl group, an alkoxy group, a haloalkoxy group, a thioalkoxy group, an acyl group, a substituted amino group, a hydroxyl group, a cyano group, a carboxyl group, a nitrile group, and a nitro group, and the substituent of the aryl group, the aralkyl group, or the heterocyclic group represented by R 1 and R 2 is selected from the group consisting of a halogen atom, an alkyl group, a haloalkyl group, an alkenyl group, an alkoxy group, a haloalkoxy group, a thioalkoxy group, an acyl group, a substituted amino group, a hydroxyl group, a cyano group, a carboxyl group, a nitrile group, and a nitro group; and the ester compound obtained from the above carboxylic acid of the formula (2) and the above alcohol of the formula (1) is a compound represented by a formula (3): R 1 —OCO—R 2 (3) wherein R 1 and R 2 are same as the above, wherein at least one of R 1 and R 2 is the heterocyclic group.