Trifluoroacetic acid → 2-[4-(2-Aminoethyl)-2-pyridyl]-4h-1,3-benzothiazine-4-one trifluoroacetic acid salt

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Reaction Steps

tert-Butyl 2-[2-(4-oxo-4H-1,3-benzothiazin-2-yl)-4-pyridyl]ethylcarbamate (0.82 g, 2.1 mmol) was dissolved in trifluoroacetic acid (10 ml), and the mixture was stirred at room temperature for 2 hrs. The solvent was evaporated, and the residue was recrystallized from methanol-diisopropyl ether to give the titled compound (0.75 g, 89%) as white crystals.

Provenance & Evidence