Hydroxylamine HCl → Tert-butyl {3-[(2-amino[1,2,4]triazolo[1,5-a]pyridin-6-yl)oxy]phenyl}carbamate

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In the same manner as in Example 17-1 and using tert-butyl {3-[(6-aminopyridin-3-yl)oxy]phenyl}carbamate (15.0 g, 49.8 mmol), ethyl isothiocyanatoformate (7.18 g, 54.8 mmol), DMSO (50 mL), hydroxylammonium chloride (11.8 g, 170 mmol), N,N-diisopropylethylamine (21.2 mL, 122 mmol), ethanol (70 mL) and methanol (70 mL) as starting materials, the title compound (10.5 g, 94%) was obtained as a white solid.

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