Oxazepines and thiazepines. 41 . Synthesis of 4‐aryl‐2,3‐dihydro‐2‐styryl‐1,5‐benzothiazepines by the reaction of (E,E)‐cinnamylideneacetophenones with 2‐aminothiophenol and their conversion into 2,2‐disubstituted 3‐acetyl‐2,3‐dihydrobezothiazoles

New 4‐aryl‐2,3‐dihydro‐2‐styryl‐1,5‐benzothiazepines 8–13 have been synthesized by an acid catalyzed reaction of 2‐arninothiophenol (1) and (E,E)‐cinnamylideneacetophenones 2–7. Ring contraction of 1,5‐benzothiazepines 8–13 provided 2,2‐disubstituted 3‐acetyl‐2,3‐dihydrobenzothiazoles 14–19 under acetylating conditions.