Fmoc-L-Tyr(tBu)-OH → (9H-fluoren-9-yl)methyl (S)-3-(4-tert-butoxyphenyl)-1-(((S)-1,1-diethoxypropan-2-yl)(naphthalen-1-ylmethyl)amino)-1-oxopropan-2-ylcarbamate

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According to the procedure described in the synthesis method of Compound III-5, (S)-1,1-diethoxy-N-(naphthalen-1-ylmethyl)propan-2-amine (Compound IX-6) (686 mg, 2.4 mmol) was coupled with (S)-2-(((9H-fluoren-9-yl)methoxy)carbonylamino)-3-(4-tert-butoxyphenyl)propanoic acid (1.15 g, 2.51 mmol) and the obtained residue was purified by Büch silica gel column chromatography (eluent: n-hexane:ethyl acetate=7:3) to obtain the title compound (1.384 g, 79%).

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