反应详情

温度

0 °C

tert-Butyl 6-(8-methyl-4-oxo-4H-1,3-benzothiazin-2-yl)-2-pyridinecarboxylate (0.50 g, 1.4 mmol) was dissolved in trifluoroacetic acid (5 ml), and the mixture was stirred at 0° C. for 4 hrs. The solvent was evaporated, and the residue was crystallized from diethyl ether to give the titled compound (0.39 g, 94%) as pale yellow crystals.

1. customThe solvent was evaporated
2. customthe residue was crystallized from diethyl ether