4H-1,4-Benzothiazines, their monoxides, and their dioxides are readily prepared via lithiation and intramolecular cyclisation of 2-acylaminophenyl alkyl sulphides, sulphoxides, and sulphones with lithium di-isopropylamide in tetrahydrofuran at –50 °C.
F. Babudri, S. Florio, A. M. Vitrani and L. Di Nunno, J. Chem. Soc., Perkin Trans. 1, 1984, 1899 DOI: 10.1039/P19840001899
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