1,2-Dichloroethane → (2S,4S)-tert-butyl 4-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-2-(((R)-1,2,3,4-tetrahydronaphthalen-1-yl)carbamoyl)pyrrolidine-1-carboxylate

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To a solution of (2S,4S)-Boc-gamma-(Fmoc-amino)-proline (Chem-Impex, 6.00 g, 13.3 mmol) in DMF (20 mL) at 0° C. were added EDC (3.05 g, 15.9 mmol), HOAt (2.17 g, 15.9 mmol) and NMM (4.38 mL, 39.8 mmol). The reaction mixture was stirred at ice bath temperature for 20 min then treated with a solution of (R)-1,2,3,4-tetrahydronaphthalen-1-amine (Alfa Aesar, 2.15 g, 14.6 mmol) in DMF (2 mL). The reaction mixture was stirred at rt for 1 h and cold water (100 mL) was added to the reaction mixture. The solid that formed was collected by filtration and washed with cold water (100 mL). The solid was dissolved in CH2Cl2 (200 mL) and the organic solution was washed with 5% aq. citric acid solution and brine, dried over MgSO4, and filtered. The filtrate was concentrated in vacuo. The residue was dissolved in CH2Cl2 and purified by flash column chromatography (gradient elution from 10 to 30% EtOAc in CH2Cl2) provided the title compound (6.70 g, 87%) as a light tan solid. 1H NMR (400 MHz, CDCl3) δ 7.79 (d, J=7.5 Hz, 2H), 7.67 (d, J=7.3 Hz, 2H), 7.42 (td, J=7.2, 4.0 Hz, 2H), 7.37-7.03 (m, 6H), 5.22 (br. s., 1H), 4.57-4.23 (m, 5H), 3.68-3.49 (m, 2H), 2.91-2.74 (m, 2H), 2.52 (d, J=13.4 Hz, 1H), 2.35-2.21 (m, 1H), 2.14 (d, J=5.1 Hz, 1H), 1.97-1.80 (m, 3H), 1.44 (s, 9H); MS (ESI+) m/z 582.2 (M+H)+.

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