Graphene oxide and sulfated graphene nanosheets: Two efficient catalysts for the synthesis of xanthene and benzoxanthane derivatives in water

Xanthenes and especially benzoxanthenes regard to various biological activities such as antiviral, antibacterial, antiinflammatory, and anticancer are one of the most importantheterocycle compounds in the medicinal chemistry [1]. With regard to excellent properties of xanthenes, the one stepenvironmentally benign synthesis of this material with good yield is a continuing important topic. The single layer of the graphite which it is well-known as graphene has attracted theconsideration of the many research groups during recent years [2]. Because of unique properties of the graphene and its usein different fields, diverse methods for the synthesis of the graphene have been established during recent years [3]. Hereinwe report a facile and straightforward method for the synthesis of the xanthene and benzoxanthane derivatives in the presence of sulfated graphene and graphene oxide nanosheet under environmental friendly conditions