Hydrochloric Acid → 3-(tetrahydro-2H-pyran-4-ylmethyl)-1-(2-thiophenylsulfonyl)piperazine hydrochloride

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Reaction Steps

A 100 mL round-bottomed flask was charged with 2-((tetrahydro-2H-pyran-4-yl)methyl)piperazine (0.950 g, 5.16 mmol), 20 mL of CH2Cl2, triethylamine (0.790 mL, 5.67 mmol), and 2-thiophenesulfonyl chloride (0.942 mL, 5.16 mmol, Sigma-Aldrich, St. Louis, Mo.). After 15 min at room temperature, the mixture was diluted with water (50 mL) and CH2Cl2 (50 mL), the organics were separated, dried (MgSO4) and concentrated to give a dark oil. To this oil was added 50 mL of ether and 10 mL of 1N HCl in ether. The resulting white precipitate was collected by filtration to give 3-(tetrahydro-2H-pyran-4-ylmethyl)-1-(2-thiophenylsulfonyl)piperazine hydrochloride (1.45 g) as an orange solid.

Provenance & Evidence