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Hitherto unknown tetracyclic 1,5-benzothiazepines 9-16 have been synthesized by an acidcatalyzed reaction of exocyclic α,β,γ,δ-unsaturated ketones 1-8 and 2-aminothiophenol. Structures of all new compounds have been elucidated by microanalyses, H-, C-NMR, IR and mass spectroscopic measurements.

Oxazepines and thiazepines 46. Synthesis of tetracyclic 1,5-benzothiazepines by the reaction of α,β,γ,δ-unsaturated ketones with 2-aminothiophenol