The fluorinated α,β-unsaturated ketone 1,1,1-trifluoro-4-ethoxy-3-butene-2-one reacted with dinucleophiles such as 2-aminothiophenol and 2-amino-ethanethiol to give trifluoroacetyl substituted 4H-1,4-benzothiazine, or 4H-1,4-thiazine, while the reaction of 5-trifluoroacetyl-3,4-dihydro-2H-pyran or 4-trifluoroacetyl-2,3-dihydro-furan with 2-amino-phenthiol gave 3-(2,2,3-2H-benzothiazolyl)-2-(trifluoromethyl)-