[CH2:1]([CH:3]([CH2:7][CH3:8])[C:4]([OH:6])=O)[CH3:2].C1C=CC2N(O)N=NC=2C=1.C(Cl)CCl.Cl.[CH2:24]([O:26][C:27]([C@@H:29]1[CH2:33][CH2:32][CH2:31][NH:30]1)=[O:28])[CH3:25].CN1CCOCC1>ClCCl>[CH2:24]([O:26][C:27]([C@@H:29]1[CH2:33][CH2:32][CH2:31][N:30]1[C:4](=[O:6])[CH:3]([CH2:1][CH3:2])[CH2:7][CH3:8])=[O:28])[CH3:25]To dichloromethane solution (350 ml) of 2-ethyl butanoic acid 5.68 g (48.9 mmol) under cooling on ice-water, HOBt 6.76 g (50 mmol), EDC 9.6 g (50 mmol) were added, stirring was continued for 30 min. 2(S)-pyrrolidine-carboxylic acid ethylester hydrochloride 8 g (45 mmol), NMM 4.55 g (45 mmol) were added to the reaction mixture and then stirred at room temperature for overnight. After then, the reaction mixture was washed with water, 1% sodium hydroxide solution, and then water sequentially. The organic layer was dried over sodium sulfate and the solvents were removed in vacuo. Purification by silica gel chromatography gave a desired product as an oil (8.16 g). NMR was consistent with the desired title product.
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