[C:1]([O:4][CH2:5][C:6]1[C:7]([N:40]2[CH2:51][CH2:50][N:49]3[C:42](=[CH:43][C:44]4[CH2:45][C:46]([CH3:53])([CH3:52])[CH2:47][C:48]=43)[C:41]2=[O:54])=[N:8][CH:9]=[CH:10][C:11]=1[C:12]1[CH:13]=[C:14]([NH:20][C:21]2[N:26]=[CH:25][C:24]([N:27]3[CH2:32][CH2:31][N:30](C(OC(C)(C)C)=O)[CH2:29][CH2:28]3)=[CH:23][CH:22]=2)[C:15](=[O:19])[N:16]([CH3:18])[CH:17]=1)(=[O:3])[CH3:2].Cl.CO>>[C:1]([O:4][CH2:5][C:6]1[C:7]([N:40]2[CH2:51][CH2:50][N:49]3[C:42](=[CH:43][C:44]4[CH2:45][C:46]([CH3:53])([CH3:52])[CH2:47][C:48]=43)[C:41]2=[O:54])=[N:8][CH:9]=[CH:10][C:11]=1[C:12]1[CH:13]=[C:14]([NH:20][C:21]2[CH:22]=[CH:23][C:24]([N:27]3[CH2:32][CH2:31][NH:30][CH2:29][CH2:28]3)=[CH:25][N:26]=2)[C:15](=[O:19])[N:16]([CH3:18])[CH:17]=1)(=[O:3])[CH3:2]A mixture of 339d (130 mg, 0.18 mmol) and HCl/methanol (4.0 mL) was stirred at room temperature for 4 h. It was then concentrated under reduced pressure to afford crude 339e (100 mg, 87%), which was used in the next step without further purification. MS-ESI: [M+H]+ 637.3.
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