title: Copper(I)-catalyzed oxidative coupling between 2-aminobenzothiazole and terminal alkyne: formation of benzothiazine.
abstract: An unprecedented formation of benzothiazine during copper(I)-catalyzed oxidative coupling of 2-aminobenzothiazole and terminal alkyne in air has been observed. This unique transformation possibly occurs through the ring opening of 2-aminobenzothiazole and subsequent oxidative coupling with alkyne followed by intramolecular cyclization. A variety of substituted benzo[b][1,4]thiazine-4-carbonitriles are obtained by this protocol.
authors.affiliation: Department of Chemistry, Visva-Bharati (A Central University) , Santiniketan 731235, India.
authors.forename: Shubhanjan
authors.initials: S
authors.lastname: Mitra
authors.forename: Amrita
authors.initials: A
authors.lastname: Chakraborty
authors.forename: Subhajit
authors.initials: S
authors.lastname: Mishra
authors.forename: Adinath
authors.initials: A
authors.lastname: Majee
authors.forename: Alakananda
authors.initials: A
authors.lastname: Hajra