Potassium Carbonate → Di-tert-butyl (2S)-2-[(tert-butoxycarbonyl)amino]-5-[4-(2-fluoroethoxy)benzyl]-hexanedioate

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Reaction Steps

To a solution of 54 mg 1-fluoro-2-iodoethane (0.31 mmol) in N,N-dimethylformamide (10 mL) was subsequently added 101 mg potassium carbonate (0.73 mmol), followed by 100 mg di-tert-butyl (2S)-2-[(tert-butoxycarbonyl)amino]-5-(4-hydroxybenzyl)-hexanedioate (from example 12d; 0.21 mmol), and the resulting mixture was stirred for 4 h at room temperature. The mixture was then partitioned between water and ethyl acetate, the aqueous layer was than extracted with ethyl acetate again. The combined organic layers were washed with brine, dried over sodium sulfate, and evaporated. The residue was purified by preparative HPLC, method A to give 85 mg (62% purity adjusted yield) of the target compound in approx. 80% purity.

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