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2-(3-Ethyl-piperazin-1-yl)-3-naphthalen-2-yl-propionic acid methyl ester, 34, (2.1 g, 6.4 mmol) and N-Boc-D-4-fluorophenylalanine (1.9 g, 6.8 mmol) and O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate (HATU) (4.9 g, 12.9 mmol) are dissolved in anhydrous DMF (20 mL). This reaction mixture is cooled to 0° C., then N-methylmorpholine (0.75 mL, 6.8 mmol) is added. The reaction mixture is placed in a refrigerator overnight. EtOAc (75 mL) and water (300 mL) are added, and the organic layer is separated. The aqueous layer is extracted with EtOAc (3×150 mL). The combined organic layers are washed with water (100 mL), dried over Na2SO4, and concentrated in vacuo. The resulting residue is purified over silica (EtOAc/Hexane, 1:2) to afford 3.5 g (91% yield) of the desired product. 1H NMR (CDCl3, δ): 7.82–7.75 (m, 3H), 7.62 (s, 1H), 7.52–7.40 (M, 2H), 7.34 (m, 1H), 7.22–7.25 (m, 2H), 7.02–6.92 (m2H), 5.75–5.62 (M, 1H), 5.18 (d, J=7.7 Hz, 0.5H), 4.90 (quartet, J=7.7 Hz, 1H), 4750–4.62 (m, 0.5H), 4.50–4.25 (m, 1H), 3.64 (d, J=9.7 Hz, 3H), 3.58–3.38 (m, 1.5H), 3.30–2.90 (m, 6H), 2.90–2.70 (m, 1H), 2.62–2.25 (d, J=11.6 Hz, 1H), 2.15–2.00 (m, 1H), 1.78–1.50 (m, 1.5H), 1.42 (s, 9H), 1.35–1.20 (m, 1H), 0.6 (t, J=9.7 Hz, 2H); 13C NMR, δ 174.2, 171.6, 171.0, 170.2, 164.0, 160.2, 156, 135.7, 133.7, 132.4, 131.4, 131.3, 128.1, 127.8, 127.6, 127.5, 126.2, 125.7, 115.7, 115.5, 115.4, 115.3, 79.9, 68.9, 68.7, 55.9, 54.1, 53.7, 51.4, 51.2, 51.0, 47.5, 46.6, 40.1, 39.1, 38.1, 35.4, 28.5, 22.9, 21.9, 10.6, 10.0

1. customis placed in a refrigerator overnight
2. customthe organic layer is separated
3. extractionThe aqueous layer is extracted with EtOAc (3×150 mL)
4. washThe combined organic layers are washed with water (100 mL)
5. dry with materialdried over Na2SO4
6. concentrationconcentrated in vacuo
7. customThe resulting residue is purified over silica (EtOAc/Hexane, 1:2)