title: The Acid and/or Thermal Mediated Ring Contraction of 4H-1,2,6-Thiadiazines To Afford 1,2,5-Thiadiazoles.
abstract: A near-quantitative acid and/or thermal mediated ring contraction of 3',5'-diarylspiro(benzo[d][1,3]dioxole-2,4'-[1,2,6]thiadiazines) affords 3-aryl-4-(2-arylbenzo[d][1,3]dioxol-2-yl)-1,2,5-thiadiazoles. The reaction scope was studied providing 11 examples of this ring contraction. A double Wagner-Meerwein reaction mechanism is proposed.
authors.affiliation: Department of Chemistry, University of Cyprus , P.O. Box 20537, 1678 Nicosia, Cyprus.
authors.forename: Andreas S
authors.initials: AS
authors.lastname: Kalogirou
authors.affiliation: Department of Chemistry, University of Cyprus , P.O. Box 20537, 1678 Nicosia, Cyprus.
authors.forename: Andreas
authors.initials: A
authors.lastname: Kourtellaris
authors.affiliation: Department of Chemistry, University of Cyprus , P.O. Box 20537, 1678 Nicosia, Cyprus.
authors.forename: Panayiotis A
authors.initials: PA
authors.lastname: Koutentis