[CH:1]([O:4][C:5]([N:7]1[CH2:12][CH2:11][CH:10]([O:13][N:14]=[C:15]2[CH2:20][CH2:19][N:18]([C:21]3[CH:26]=[C:25]([NH2:27])[C:24]([NH2:28])=[CH:23][C:22]=3[F:29])[CH2:17][CH2:16]2)[CH2:9][CH2:8]1)=[O:6])([CH3:3])[CH3:2].[CH3:30]C1C=CC(S(O)(=O)=O)=CC=1.O.C(OC)(OC)OC>CN(C=O)C>[CH:1]([O:4][C:5]([N:7]1[CH2:12][CH2:11][CH:10]([O:13][N:14]=[C:15]2[CH2:20][CH2:19][N:18]([C:21]3[C:22]([F:29])=[CH:23][C:24]4[N:28]=[CH:30][NH:27][C:25]=4[CH:26]=3)[CH2:17][CH2:16]2)[CH2:9][CH2:8]1)=[O:6])([CH3:3])[CH3:2]The crude 60b was combined with TsOH.H2O (50 mg) in 2 mL of DMF and treated with HC(OMe)3 (1 mL). The mixture was stirred for 16 h then concentrated and purified on preparative HPLC to afford 60-1: LC-MS 418.4 (MH+), tR=4.64 (Method 4).
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