Trifluoroacetic acid → (2S)-2-Amino-5-{[5-(2-fluoroethoxy)pyridin-2-yl]methyl}hexanedioic acid

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Reaction Steps

To a solution of 56 mg of di-tert-butyl (2S)-2-[(tert-butoxycarbonyl)amino]-5-{[5-(2-fluoroethoxy)pyridin-2-yl]methyl}hexanedioate (0.1 mmol) in anisol (0.7 mL) was added trifluoroacetic acid (1.5 mL), and the resulting mixture was stirred for 3 h at room temperature. Trifluoroacetic acid was removed under reduced pressure, water (approx. 2 mL) was added and separating anisol (which was expected to encumber preparative HPLC if present in large excess) was removed. The remaining aqueous solution of the crude product was directly loaded onto a preparative HPLC, method B, to give 14 mg of the target compound as white, hygroscopic lyophilisate (approx. 40% yield).

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