139564-99-1

Upstream product

• 139564-97-9 2-<(E/Z)-α-Chlor-4-methoxybenzyliden>-4-(2-dimethylaminoethyl)-2H-1,4-benzothiazin-3(4H)-on 
• 4584-46-7 (2-chloroethyl)dimethylamine hydrochloride 
• 55043-26-0 2H-2(Z)-(4-methoxybenzylidene)-1,4-benzothiazin-3(4H)-one 

Relevant academic research and scientific papers

Studies on the Chemistry of O,N- and S,N-Containing Heterocycles, 13. - Investigations on the Ring Contraction of 1,5-Benzothiazepines to 1,4-Benzothiazines

Reaction of the (3R)-1,5-benzothiazepinon derivative 5 with NaNO2 in glacial acetic acid leads to the rac-1,4-benzothiazinone derivatives 6a and 7.Furthermore, reaction of 5 with NaNO2 in sulphuric acid/KBr yields the ring-contracted compound rac-6b.Compo