Cl[C:2](=[O:7])[C:3]([O:5][CH3:6])=[O:4].[NH2:8][C:9]1[CH:14]=[CH:13][C:12]([C@H:15]2[CH2:20][CH2:19][C@H:18]([CH:21]([CH3:27])[C:22]([O:24][CH2:25][CH3:26])=[O:23])[CH2:17][CH2:16]2)=[CH:11][CH:10]=1.N1C=CC=CC=1>C(Cl)Cl>[CH3:6][O:5][C:3](=[O:4])[C:2]([NH:8][C:9]1[CH:10]=[CH:11][C:12]([C@H:15]2[CH2:16][CH2:17][C@H:18]([CH:21]([CH3:27])[C:22]([O:24][CH2:25][CH3:26])=[O:23])[CH2:19][CH2:20]2)=[CH:13][CH:14]=1)=[O:7]A solution of methyl chlorooxoacetate (670 mg, 5.45 mmol) in DCM (3 mL) was added in one portion to a solution of trans-ethyl 2-[4-(4-aminophenyl)cyclohexyl]propanoate (1.0 g, 3.63 mmol) and pyridine (0.59 mL, 7.26 mmol) in DCM (22 mL) at 5° C. and the mixture was warmed to room temperature and stirred for 2 h. The reaction mixture was concentrated in vacuo and EtOAc (30 mL) was added. The layers were separated and the organic layer was washed with water (25 mL) and brine (25 mL). The organic layer was dried and concentrated in vacuo to give the title compound (1.3 g, 99%) as a solid; 1H NMR δ (CDCl3) 1.0-1.1.25 (2H, m), 1.1 (3H, d), 1.2 (3H, t), 1.3-1.47 (2H, m), 1.48-1.55 (2H, m), 1.68-1.79 (1H, m), 1.8-1.95 (2H, m), 2.18-2.28 (1H, m), 2.35-2.5 (1H, m), 3.9 (3H, t), 4.08 (2H, q), 7.12 (2H, d), 7.47 (2H, d); MS m/e (M−H)− 360.
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