Hydrogen chloride-ethyl acetate → 1-[3-(2-Fluorophenyl)-1,2,4-thiadiazol-5-yl]piperazine hydrochloride

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Reaction Steps

A mixture of tert-butyl 4-[3-(2-fluorophenyl)-1,2,4-thiadiazol-5-yl]piperazine-1-carboxylate (5.70 g, 15.6 mmol), 4 N hydrogen chloride/ethyl acetate (200 ml) and methanol (100 ml) was stirred at room temperature for 12 hours. The solvent was distilled off under reduced pressure, and the residue was recrystallized from a mixed solvent of methanol and ether to give 4.31 g (86.5%) of the desired product as a solid.

Provenance & Evidence