[CH2:1]([O:8][C:9]([N:11]1[CH2:15][CH:14]([C:16](=[O:24])[NH:17][C:18]2[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=2)[CH:13]2[N:25]([C:28](=[O:44])[CH:29]([NH:36]C(OC(C)(C)C)=O)[CH:30]3[CH2:35][CH2:34][CH2:33][CH2:32][CH2:31]3)[CH2:26][CH2:27][CH:12]12)=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C(O)(C(F)(F)F)=O>C(Cl)Cl>[CH2:1]([O:8][C:9]([N:11]1[CH2:15][CH:14]([C:16](=[O:24])[NH:17][C:18]2[CH:19]=[CH:20][CH:21]=[CH:22][CH:23]=2)[CH:13]2[N:25]([C:28](=[O:44])[CH:29]([NH2:36])[CH:30]3[CH2:35][CH2:34][CH2:33][CH2:32][CH2:31]3)[CH2:26][CH2:27][CH:12]12)=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1A solution of 39 (460 mg, 0.76 mmol) in DCM (10 mL) was cooled to 0° C. and treated with TFA (4 mL). After 2 h, the solution was concentrated, diluted with EtOAc and washed with saturated aqueous NaHCO3, brine, dried over anhydrous Na2SO4, filtered and concentrated to afford 40 (366 mg) as a pale yellow-colored foam that was used without further purification. Mass spectrum, m/z [505.5] (M+H)+.
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