[C:1]([O:10][CH3:11])(=[O:9])[CH2:2][CH2:3][CH2:4][CH2:5][C:6]([O-:8])=O.[NH:12]1[CH2:17][CH2:16][O:15][CH2:14][CH2:13]1.Cl.C(N=C=NCCCN(C)C)C.C(N(CC)CC)C>C(Cl)(Cl)Cl>[N:12]1([C:6](=[O:8])[CH2:5][CH2:4][CH2:3][CH2:2][C:1]([O:10][CH3:11])=[O:9])[CH2:17][CH2:16][O:15][CH2:14][CH2:13]1Monomethyl adipate (3.20 g) is dissolved in chloroform (70 ml), and thereto are added morpholine (2.61 g), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (5.75 g) and triethylamine (3.04 g) under ice-cooling. The mixture is then stirred at room temperature for 19 hours. Ice-water is added to the reaction solution and the mixture is extracted with chloroform. The organic layer is washed with 10% hydrochloric acid, saturated aqueous sodium hydrogen carbonate solution and saturated brine successively and dried over sodium sulfate. The solvent is removed by evaporation under reduced pressure to give methyl 6-morpholin-4-yl-6-oxohexanoate (4.63 g).
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