Benzo[1,5]thiazepine: Synthesis, Reactions, Spectroscopy, and Applications

Scheme 5

Cyclocondensation of 1-(4-(methylsulfonyl)phenyl)-2-tosyl-3-(3,4,5-trisubstituted-phenyl)prop-2-en-1-ones with o-aminothiophenol in refluxing toluene using catalytic amounts of trifluoroacetic acid.