4-Chloro-2-sulfanylbenzoic acid → tert-Butyl 3-[6-(7-chloro-4-oxo-4H-1,3-benzothiazin-2-yl)-2-pyridyl]propanoate

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Reaction Steps

tert-Butyl 3-(6-cyano-2-pyridyl)propanoate (1.6 g, 6.9 mmol) and 4-chlorothiosalicylic acid (2.6 g, 13.7 mmol) were dissolved in pyridine (15 ml), and the mixture was refluxed for 13 hrs. The solvent was evaporated. The residue was subjected to a silica gel column chromatography. The fractions eluted with hexane-ethyl acetate (3:1, v/v) were collected, concentrated and recrystallized from hexane-ethyl acetate to give the titled compound (1.4 g, 51%) as pale yellow crystals.

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