反应详情

tert-Butyl 3-[6-(4-oxo-4H-1,3-benzothiazin-2-yl)-2-pyridyl]propanoate (0.50 g, 1.4 mmol) was dissolved in trifluoroacetic acid (3 ml) under ice cooling condition, and the mixture was stirred for 2.5 hrs. The reaction mixture was combined with isopropylether to give the precipitated solid, which was collected by filtration and recrystallized from tetrahydrofuran-ethanol to give the titled compound (0.33 g, 77%) as white crystals.

1. customto give the precipitated solid, which
2. filtrationwas collected by filtration
3. customrecrystallized from tetrahydrofuran-ethanol