Triethylamine → tert-Butyl (6-(4-Oxo-4H-1,3-benzothiazin-2-yl)-2-pyridyl]methylcarbamate

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Reaction Steps

tert-Butyl (6-cyano-2-pyridyl)methylcarbamate (1.6 g, 6.8 mmol) and methyl thiosalicylate (1.8 g, 10.9 mmol) were dissolved in toluene (6 ml), and triethylamine (3.0 ml, 21.5 mmol) was added thereto. The mixture was refluxed for 20 hrs. After cooling, the precipitates were collected by filtration and dissolved in chloroform. The solution was subjected to a silica gel column chromatography. The fractions eluted with chloroform-methanol (20:1, v/v) were collected, concentrated and recrystallized from hexane-chloroform to give the titled compound (1.8 g, 72%) as pale yellow crystals.

Provenance & Evidence