Cesium carbonate → 1-(3-Methylpyrazin-2-yl)-1'-[4-(methylsulfonyl)phenyl]-4,4'-bipiperidine

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Reaction Steps

The 1-[4-(methylsulfonyl)phenyl]-4,4′-bipiperidine (80 mg, 0.25 mmol, prepared as for Example 1, Step 2) and cesium carbonate (243 mg, 0.75 mmol) were slurried in NMP (0.5 ml) and the 2-chloro-3-methylpyrazine (38 mg, 0.30 mmol) added. The mixture was stirred at 150 C overnight. The slurry was diluted with 15% saturated sodium bicarbonate:water (40 ml) and extracted with DCM (3×25 ml). The combined organic fraction was washed with 4:1 water:saturated sodium bicarbonate (2×), brine, dried over magnesium sulfate, filtered, and the volatiles removed in vac. The crude material was purified by chromatography on silica gel with 5% acetone:DCM to yield the titled compound.

Provenance & Evidence