Oxazepines and thiazepines.: 41.: Synthesis of 4-aryl-2,3-dihydro2-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-aminothiophenol (1) and (EE)-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.