Cyclization Reactions of 2-Acyl-1-chloro-enamines with Thioamide Functional Compounds: Alternative Access to the 1,3-Thiazine and 1,3-Oxazine Series

Article abstract of DOI:10.1007/BF00810643

2-Acyl-1-chloro-enamines 2 react with thioureas to 2,6-diamino-1,3-thiazinium salts 3, following to usual transformation mode of 1-heterosubstituted acylvinylchlorides A.On the other hand the reaction of 2 with thiobenzamide preferably leads to 4-amino-1,