Hydrochloric Acid → 4-Methyl-5-piperazin-1-yl-thiazole dihydrochloride

Participants

Reaction Steps

To a solution of tert-butyl 4-(4-methylthiazol-5-yl)piperazine-1-carboxylate (265 mg, 0.935 mmol) in diethyl ether (10 mL) was added HCl (4N in dioxane, 4.5 mL, 18 mmol) after which a precipitate formed immediately. 1,4-Dioxane (5 mL) was added to dissolve the precipitate. The mixture was stirred at room temperature for three days after which additional HCl (4N in dioxane, 5 mL, 20 mmol) and methanol (5 ml) was added. Stirring was continued for another day, the precipitate formed was collected by filtration, washed with diethylether and dried under reduced pressure to yield 208 mg of a yellow solid (0.812 mmol, 87%). MS (ESI) m/z=184.1 [M+1]+.

Provenance & Evidence