[CH2:1]([C:5]1([CH3:30])[C:14]2[C:9](=[CH:10][CH:11]=[CH:12][CH:13]=2)[C:8]([OH:15])=[C:7]([C:16]2[NH:21][C:20]3[CH:22]=[CH:23][C:24]([OH:26])=[CH:25][C:19]=3[S:18](=[O:28])(=[O:27])[N:17]=2)[C:6]1=[O:29])[CH2:2][CH2:3][CH3:4].Br[CH2:32][C:33]([NH2:35])=[O:34].C(=O)([O-])[O-].[Cs+].[Cs+]>[I-].C([N+](CCCC)(CCCC)CCCC)CCC.CN(C)C=O.C(OCC)(=O)C>[CH2:1]([C:5]1([CH3:30])[C:14]2[C:9](=[CH:10][CH:11]=[CH:12][CH:13]=2)[C:8]([OH:15])=[C:7]([C:16]2[NH:21][C:20]3[CH:22]=[CH:23][C:24]([O:26][CH2:32][C:33]([NH2:35])=[O:34])=[CH:25][C:19]=3[S:18](=[O:28])(=[O:27])[N:17]=2)[C:6]1=[O:29])[CH2:2][CH2:3][CH3:4]A solution of Example 27H (0.100 g, 0.235 mmol), 2-bromoacetamide (0.097 g, 0.703 mmol), cesium carbonate (0.382 g, 1.17 mmol), and tetrabutylammonium iodide (0.001 g, 0.024 mmol) in dimethylformamide (2.5 mL) was stirred at 25° C. for 72 hours. The mixture was diluted with ethyl acetate, washed with water and brine, dried with sodium sulfate, filtered, and concentrated in vacuo to give the free acid (0.076 g).
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