Imidazole → 1-[2-(2-t-Butyldimethylsilyloxymethyl-4-bromophenoxy)ethyl]pyrrolidine

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To a solution of (500 mg, 1.67 mmol) 1-[2-(2-hydroxymethyl-4-bromophenoxy)ethyl]pyrrolidine (Part A) in 5.5 mL of anhydrous DMF was added 377 mg of t-butyldimethylsilyl chloride followed by addition of 113 mg of imidazole. The reaction mixture was stirred at room temperature for 30 h. To the reaction was added 6 mL of water. The mixture was extracted with EtOAc (3×60 mL). The combined organic layers were dried over MgSO4 and concentrated to dryness. The residue was azeotroped with xylenes to remove any DMF present. Purification by flash chromatography (silica gel, 3% to 4% [10% conc NH4OH in MeOH]/CH2Cl2) afforded 528 mg (1.27 mmol, 77%) of a yellow oil.

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