Piperidine → (S)-2-amino-N-(benzo[b]thiophen-3-ylmethyl)-3-(4-tert-butoxyphenyl)-N-((S)-1,1-diethoxypropan-2-yl)propanamide

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According to the procedure described in the synthesis method of Compound IV-1, (9H-fluoren-9-yl)methyl (S)-1-((benzo[b]thiophen-3-ylmethyl)((S)-1,1-diethoxypropan-2-yl)amino)-3-(4-tert-butoxyphenyl)-1-oxopropan-2-ylcarbamate (Compound III-6) 500 mg (0.68 mmol) was treated with piperidine and purified on silica gel column chromatography (n-hexane:ethyl acetate=9:1, chloroform:methanol=100:0 and 8:2) to obtain the title compound 339 mg (98%).

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