To a solution of Intermediate 3 (120 mg, 0.39 mmol) in N,N-dimethylformamide (2 mL) was added 4-fluorobenzyl bromide (0.05 mL, 0.39 mmol), potassium carbonate (81 mg, 0.58 mmol) and 18-crown-6 (10 mg). The slurry was stirred at ambient temperature for two hours. The reaction was partitioned between ethyl acetate and water. The organic layer was washed with water and brine and dried over magnesium sulfate. The slurry was filtered and concentrated in vacuo. The crude material was purified using normal phase chromatography (ethyl acetate/heptane) to provide the alkylated product as a colorless oil. (63 mg, 38% yield). MS (M+H): 417
