Cesium carbonate → 4-[(4R,5S)-5-ethyl-3,3-difluoro-4-hydroxy-2-oxopyrrolidin-1-yl]-2-methoxybenzonitrile

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Br[C:2]1[CH:9]=[CH:8][C:5]([C:6]#[N:7])=[C:4]([O:10][CH3:11])[CH:3]=1.[CH2:12]([C@@H:14]1[NH:18][C:17](=[O:19])[C:16]([F:21])([F:20])[C@@H:15]1[OH:22])[CH3:13].C1(P(C2C=CC=CC=2)C2C3OC4C(=CC=CC=4P(C4C=CC=CC=4)C4C=CC=CC=4)C(C)(C)C=3C=CC=2)C=CC=CC=1.C(=O)([O-])[O-].[Cs+].[Cs+]>C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.[Pd].[Pd]>[CH2:12]([C@@H:14]1[N:18]([C:2]2[CH:9]=[CH:8][C:5]([C:6]#[N:7])=[C:4]([O:10][CH3:11])[CH:3]=2)[C:17](=[O:19])[C:16]([F:20])([F:21])[C@@H:15]1[OH:22])[CH3:13]