3-{Ethoxycarbonylmethyl-[6-(9H-fluoren-9-ylmethoxycarbonylamino)-hexanoyl]-amino)-propionic acid ethyl ester → 3-[(6-Amino-hexanoyl)-ethoxycarbonylmethyl-amino]-propionic acid ethyl ester

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Reaction Steps

3-{Ethoxycarbonylmethyl-[6-(9H-fluoren-9-ylmethoxycarbonylamino)-hexanoyl]-amino}-propionic acid ethyl ester AB (11.5 g, 21.3 mmol) can be dissolved in 20% piperidine in dimethylformamide at 0° C. The solution can be stirred continuously for 1 h. The reaction mixture can be concentrated under vacuum, water can be added to the residue, and the product can be extracted with ethyl acetate. The crude product can be purified by conversion into its hydrochloride salt.

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