title: Metal-free Brønsted acid mediated synthesis of fully substituted thiophenes via chemo- and regioselective intramolecular cyclization of α,α'-bis(β-oxodithioesters) at room temperature.
abstract: Metal-free para-toluenesulfonic acid mediated straightforward synthesis of hitherto unreported tetrasubstituted thiophenes has been achieved in quantitative yields by chemo- and regioselective dehydrative cyclization of α,α'-bis(β-oxodithioesters) at room temperature. Notably, the dithioester group at the 4-position of the thiophene ring has been further transformed to a thiazoline group.
authors.affiliation: Department of Chemistry, Faculty of Science, Banaras Hindu University, Varanasi 221005, India. mayashankarbhu@gmail.com.
authors.forename: B Janaki
authors.initials: BJ
authors.lastname: Ramulu
authors.forename: Suvajit
authors.initials: S
authors.lastname: Koley
authors.forename: Maya Shankar
authors.initials: MS
authors.lastname: Singh