The Synthesis of 1,3-Thiazine-2,4-dithiones by the Reaction of Carbon Disulfide with Cyclic Ketones or Their Ketimines

Abstract
Cyclohexanone, 4-methylcyclohexanone, and phloroglucinol, when treated with carbon disulfide in the presence of triethylamine and aqueous ammonia, gave the respective 3,1-benzothiazine-2(1H),4-dithiones. Glutazines and 2-iminocyclopentanedithiocarboxylic acid underwent this reaction without ammonia.