Br[CH2:2][C:3]([C:5]1[C:6]([CH3:17])=[N:7][O:8][C:9]=1[C:10]1[CH:15]=[CH:14][C:13]([Br:16])=[CH:12][CH:11]=1)=[O:4].[CH2:18]([SH:25])[C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1.C(=O)([O-])[O-].[Cs+].[Cs+]>CN(C=O)C>[CH2:18]([S:25][CH2:2][C:3]([C:5]1[C:6]([CH3:17])=[N:7][O:8][C:9]=1[C:10]1[CH:15]=[CH:14][C:13]([Br:16])=[CH:12][CH:11]=1)=[O:4])[C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=12-bromo-1-[5-(4-bromo-phenyl)-3-methyl-isoxazol-4-yl]-ethanone and benzyl mercaptan were dissolved in DMF. Cesium carbonate was added and the reaction stirred overnight. Standard aqueous workup afforded provided the product.
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