Intramolecular cycloaddition–elimination reactions of 4-methyl-5-(substituted)-imino-Δ2-1,2,3,4-thiatriazolines
Abstract
4-Methyl-1,2,3,4-thiatriazolin-5-imines, bearing a cyanopropyl, o-cyanobenzyl or o-(cyanomethyl)-benzyl group at the exocyclic imine function, thermolyse smoothly to give, after loss of nitrogen, fused 1,2,4-thiadiazole derivatives 7,11 and 12.