Benzyl 8-bromooctanoate → 7-(benzyloxycarbonyl)heptyl 5-(Cbz-amino)-4-oxopentanoate

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This compound was prepared from the product of 10a (0.79 g; 2.5 mmol) and 8b (1.0 g; 2.5 mmol) according to Procedure C. The reaction time was 2 days. The crude product was purified on a 80×45 mm silica gel 60 column eluted with ethyl acetate-hexane (1:1) (1000 mL) collecting 13×50 mL fractions. Fractions containing the product (3-6) were collected, and after evaporation 0.83 g (67%) product was obtained (amber oil that solidified to a waxy solid on standing in the freezer, mp 52-54° C.).

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