Diisopropylethylamine → HCID 66894477、化合物

反応式

[CH3:1][O:2][C:3](=[O:13])[C@@H:4]([NH2:12])[CH2:5][CH:6]1[CH2:11][CH2:10][CH2:9][CH2:8][CH2:7]1.C(N(CC)C(C)C)(C)C.C([O:25][C:26](=O)[CH:27]=[C:28]([O:31][C:32]1[CH:37]=[CH:36][CH:35]=[C:34]([Cl:38])[C:33]=1[Cl:39])[CH2:29]Br)C>CN(C)C=O>[CH3:1][O:2][C:3](=[O:13])[C@@H:4]([N:12]1[CH2:29][C:28]([O:31][C:32]2[CH:37]=[CH:36][CH:35]=[C:34]([Cl:38])[C:33]=2[Cl:39])=[CH:27][C:26]1=[O:25])[CH2:5][CH:6]1[CH2:11][CH2:10][CH2:9][CH2:8][CH2:7]1

参加物

実験手順

To a stirred solution of (S)-2-amino-3-cyclohexyl-propionic acid methyl ester (1.15 g, 0.062 mol) in N,N-dimethylformamide (5 mL) was added N,N-diisopropylethylamine (3.63 g, 0.282 mol) slowly at room temperature, under nitrogen. The resulting mixture was stirred for 5 min and then treated with 4-bromo-3-(2,3-dichloro-phenoxy)-but-2-enoic acid ethyl ester (2.0 g, 0.006 mol) and the reaction mixture was heated at 110° C.-120° C. for 16 h. After this time, ice water was added and the resulting mixture was extracted with ethyl acetate. The combined organic layers were washed with a saturated aqueous sodium chloride solution, dried over sodium sulfate and concentrated in vacuo. Purification using flash column chromatography (silica gel (100-200 mesh)) afforded (S)-3-cyclohexyl-2-[4-(2,3-dichloro-phenoxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-propionic acid methyl ester (0.40 g, 17%) as a yellow oil.