Br[CH2:2][C:3]1[CH:16]=[CH:15][CH:14]=[CH:13][C:4]=1[CH2:5][O:6][CH2:7][C@H:8]([NH2:12])[CH2:9][CH:10]=[CH2:11].C([O-])([O-])=O.[K+].[K+]>CCO>[CH2:9]([C@H:8]1[NH:12][CH2:2][C:3]2[CH:16]=[CH:15][CH:14]=[CH:13][C:4]=2[CH2:5][O:6][CH2:7]1)[CH:10]=[CH2:11]To a solution of compound 18k (2.0 g, 7.0 mmol) in EtOH (20 mL) was added K2CO3 (4.8 g, 35.0 mmol) portionwise. The mixture was heated to reflux for 2 h to complete the reaction. The reaction mixture was cooled down to rt and concentrated under reduced pressure to give compound 18l (1.2 g, 84% yield), which was used without purification. LCMS (m/z): 204.1 (MH+).
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