One‐pot Green Procedure for Synthesis of Tetrahydrobenzo[<i>a</i>]xanthene‐11‐one Catalyzed by Brønsted Ionic Liquids under Solvent‐free Conditions

Abstract

Abstract An efficient one‐pot condensation of β ‐naphthol, aldehydes and cyclic 1,3‐dicarbonyl compound has been achieved with ionic liquids as catalyst, thus a variety of 8,9,10,12‐tetrahydrobenzo[ a ]xanthen‐11‐one derivatives were prepared in good yields. The present approach offers several advantages such as shorter reaction times, good yields and mild reaction conditions.