N-(9-Fluorenylmethoxycarbonyloxy)succinimide → Fmoc-L-Prolinol

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Reaction Steps

L-prolinol (Compound 1) (0.61 g, 6.0 mmol) was dissolved in 70 ml of pure water, thus preparing an L-prolinol aqueous solution. N-(9-Fluorenylmethoxycarbonyloxy)succinimide (Fmoc-OSu) (2.0 g, 6.0 mmol) was dissolved in 10 ml of THF. This THF solution was added to the L-prolinol aqueous solution, and this was stirred for 1 hour so as to react the L-prolinol and the Fmoc-OSu. The reaction solution was separated into a liquid fraction and a precipitate fraction. These fractions respectively were subjected to extraction with ethyl acetate, and organic layers respectively were collected therefrom. The thus-obtained organic layers were mixed together, and anhydrous sodium sulfate was added thereto to absorb moisture (hereinafter, this process is referred to as a “drying” process). The organic layers were filtered, and the filtrate obtained was vacuum concentrated. The residual substance obtained was purified by silica gel column chromatography (the eluent: hexane:ethyl acetate=1:1). Thus, Compound 2 was obtained (1.4 g, yield: 74%). The result of NMR analysis with respect to this compound is shown below.

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