title: One pot oxidative N-S bond formation to access 2-sulfenylimine chromenes.
abstract: The synthesis of 2-sulfenylimine chromene compounds (8) is accomplished by reacting benzaldehyde (1), malanonitrile (2) and dimedone (3) followed by sequential addition of N-chlorosuccinimide and thiophenols to the in situ formed 2-amino-4(H) chromenes (4) in a one pot, catalyst free, five component reaction in toluene medium. When aniline was employed as the nucleophile in place of thiophenol, the formation of hexahydrobenzofuran-2-N-phenyl carboxamide derivatives (5) was observed. Excellent yields, simple reaction conditions and high compatibility are the advantages of this protocol.
authors.affiliation: Division of Crop Protection Chemicals, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad 500 007, India.
authors.forename: Ashok
authors.initials: A
authors.lastname: Kale
authors.forename: Madhu
authors.initials: M
authors.lastname: Chennapuram
authors.forename: Chiranjeevi
authors.initials: C
authors.lastname: Bingi
authors.forename: Jagadeesh Babu
authors.initials: JB
authors.lastname: Nanubolu
authors.forename: Krishnaiah
authors.initials: K
authors.lastname: Atmakur