How is Ethyl-2-Benzofuran Impurity 6 (CAS: 3131-63-3) typically synthesized?

Ethyl-2-Benzofuran Impurity 6 (CAS: 3131-63-3) is typically synthesized through the reduction of ethyl-2-benzofuranone using a suitable reducing agent such as sodium borohydride. The reaction is conducted in an organic solvent like ethanol at room temperature. The yield is generally high, around 85-95%, and the method is selective for the desired product without significant formation of other impurities.