Potassium Carbonate → Anthracene

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A solution of 9-((methylamino)methyl)anthracene (1.00 g, 4.5 mmol), 2-bromobenzyl bromide (1.13 g, 4.5 mmol) and K2CO3 (0.691 g, 5.0 mmol) in 50 mL of acetonitrile was refluxed under nitrogen for 18 hr. The solution was filtered on a sintered-glass filter and solvent was removed from the filtrate under reduced pressure to yield 9-(N-Methyl-N-(o-bromobenzyl)amino)methyl)anthracene (95% by NMR). The resulting solid was taken up in diethyl ether (50 mL), and treated at 0° C. with 1 equiv of butyllithium. The mixture was stirred at 0° C. for 2 h at which time 5 equiv of trimethyborate was added via a cannula. After warming the mixture to room temperature, 50 mL of water was added to quench the reaction. The ether layer was separated, washed with 3×10 mL water, and dried over sodium sulfate. Removal of the solvent under reduced pressure provided a solid identical to that obtained in (A) in 52% yield.

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