Hydrochloric Acid → N-(2-{4-[4-(1,5-Dimethyl-1H-pyrazol-4-ylmethyl)-3,4,5,6-tetrahydro-2H-[1,2']bipyrazinyl-3'-yl]-phenyl}-ethyl)-methanesulfonamide hydrochloride

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Dissolve 3′-chloro-4-(1,5-dimethyl-1H-pyrazol-4-ylmethyl)-3,4,5,6-tetrahydro-2H-[1,2′]bipyrazinyl (307 mg, 1.0 mmol) in N,N-dimethylacetamide (4 mL). Add potassium carbonate (331 mg, 2.4 mmol), 4-sulfonylaminoethyl benzene boronic acid (292 mg, 1.2 mmol), tetrakis(triphenylphosphine)palladium(0) (0.0050 g, 0.0058 mmol), then water (2 mL) and degas with nitrogen for 10 min. Heat at 120° C. for 20 hr., then purify by SCX-2® chromatography washing with methanol. Elute with 2 M ammonia in methanol and concentrate. Recrystallize from DMSO:methanol (1:1), filter and wash with diethyl ether, to give a whitish powder. Dissolve the powder in acetonitrile and convert to the hydrochloride salt by adding 2 M aq HCl solution. Add water and lyophilize to give the title compound as a yellow powder (365 mg, 71%). MS (ES): m/z=470 [M+H]+.

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