[Br:1][C:2]1[CH:10]=[C:9]([OH:11])[CH:8]=[C:7]2[C:3]=1[CH2:4][NH:5][C:6]2=[O:12].C([O-])([O-])=O.[Cs+].[Cs+].Br[CH2:20][C:21]([O:23][C:24]([CH3:27])([CH3:26])[CH3:25])=[O:22]>CN(C=O)C.O>[Br:1][C:2]1[CH:10]=[C:9]([O:11][CH2:20][C:21]([O:23][C:24]([CH3:27])([CH3:26])[CH3:25])=[O:22])[CH:8]=[C:7]2[C:3]=1[CH2:4][NH:5][C:6]2=[O:12]A mixture of Example 104B (103 mg, 0.45 mmol), Cs2CO3 (164 mg, 0.5 mmol) and t-butyl bromoacetate (0.075 mL, 0.5 mmol) in DMF (2.2 mL) was stirred overnight at room temperature, diluted with water, and filtered. The filter cake was dried to give 154 mg (45%) of the desired product. MS (ESI(+)) m/e 342,344 (M+H)+.
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