Water → 5-chlorothiazolo[5,4-b]pyridin-2-amine

Participants

Reaction Steps

Potassium thiocyanate (16.0 g, 165 mmol) and 6-chloropyridin-3-amine (2.6 g, 20.2 mmol) were dissolved in acetic acid (52 mL). To this solution was added dropwise a solution of bromine (3.2 mL, 62.5 mmol) in acetic acid (12 mL) under cooling in a water bath, and the mixture was stirred for 2 hr. The mixture was warmed to, stirred for 10 hr, and water (30 mL) was added. This reaction mixture was filtered at 85° C., and the insoluble material was suspended in acetic acid (50 mL) and the suspension was filtered. The obtained filtrate was neutralized with aqueous ammonia solution, and the precipitated solid was collected by filtration and recrystallized from methanol to give the title compound (2.0 g, 54%) as a colorless powder.

Provenance & Evidence