title: Diversified Synthesis of Furans by Coupling between Enols/1,3-Dicarbonyl Compounds and Nitroolefins: Direct Access to Dioxa[5]helicenes.
abstract: A versatile method for the diversified synthesis of furans and arenofurans has been developed that proceeds through K2CO3-promoted cyclization between enols/1,3-dicarbonyl compounds and nitroolefins at reflux in EtOH. This facile method has been successfully employed in the synthesis of benzotrifuran derivatives, which are useful hole-transporting materials. This procedure also provides direct access to dioxa[5]helicenes. This reaction offers a broad substrate scope, uses an inexpensive base and environmentally benign solvent, and is operationally simple.
authors.affiliation: Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, West Bengal, India.
authors.forename: Monoranjan
authors.initials: M
authors.lastname: Ghosh
authors.affiliation: Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, West Bengal, India.
authors.forename: Sougata
authors.initials: S
authors.lastname: Santra
authors.affiliation: Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, West Bengal, India.
authors.forename: Pallab
authors.initials: P
authors.lastname: Mondal
authors.affiliation: Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, West Bengal, India.
authors.forename: Dhiman
authors.initials: D
authors.lastname: Kundu
authors.affiliation: Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, West Bengal, India. alakananda.hajra@visva-bharati.ac.in.
authors.forename: Alakananda
authors.initials: A
authors.lastname: Hajra
keywords: denitration; furans; helicenes; heterocycles; synthetic methods