bond is an accessible and convenient method for the synthesis of five- and six-membered
sulfur- and nitrogen-containing heterocycles – primarily 4H-1,3-thiazin-4-ones [1] and
thiazolidin-4-ones [2], and also 2-thioxopiperidines [3], thiopyran-4-ones [4], and pyrimidin-4-ones
[5]. Heterocyclic … Modern physical methods of establishing the structure of the synthesized
products were used, and this made it possible to prove their structure unequivocally. For this …