C(N(C(C)C)CC)(C)C.C1N(P(Cl)(N2C(=O)OCC2)=O)C(=O)OC1.[Cl:25][CH2:26][CH2:27][CH2:28][CH:29]([CH:33]1[CH2:35][CH2:34]1)[C:30]([OH:32])=O.[C:36]([O:40][C:41]([CH3:44])([CH3:43])[CH3:42])(=[O:39])[NH:37][NH2:38]>C(Cl)Cl.O.C(OCC)(=O)C>[Cl:25][CH2:26][CH2:27][CH2:28][CH:29]([CH:33]1[CH2:35][CH2:34]1)[C:30]([NH:38][NH:37][C:36]([O:40][C:41]([CH3:44])([CH3:43])[CH3:42])=[O:39])=[O:32]IPEA (1.6 ml) and BOPCl (1.2 g) were added to a solution of the crude 5-chloro-2-cyclopropyl-valeric acid (550 mg) and tert-butyl carbazate (CAS No. 870-46-2, 555 mg) in methylene chloride (5 ml), and the reaction solution was stirred at room temperature for three hours. Ethyl acetate and water were added to the reaction solution, and the organic layer was separated. The organic layer was sequentially washed with 1 N hydrochloric acid, water, a saturated sodium bicarbonate solution and brine, dried over anhydrous magnesium sulfate and then concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography (elution solvent: heptane-ethyl acetate system) to obtain 210 mg of the title compound. The property value of the compound is as follows.
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