[Cl:1][C:2]1[CH:3]=[C:4]([NH:10][C:11]2[N:16]=[CH:15][C:14]([N:17]3[CH2:22][CH2:21][N:20](C(OC(C)(C)C)=O)[CH2:19][C@@H:18]3[CH3:30])=[CH:13][CH:12]=2)[C:5]([O:8]C)=[N:6][CH:7]=1>O1CCOCC1.Cl>[Cl:1][C:2]1[CH:3]=[C:4]([NH:10][C:11]2[CH:12]=[CH:13][C:14]([N:17]3[CH2:22][CH2:21][NH:20][CH2:19][C@@H:18]3[CH3:30])=[CH:15][N:16]=2)[C:5](=[O:8])[NH:6][CH:7]=1A solution of 138a (1.0 g, 2.3 mmol) in dioxane/HCl (30 mL) was stirred at 100° C. for 2 h. It was then evaporated under reduced pressure to afford 138b (1.48 g, crude) as a yellow solid. MS-ESI: [M+H]+ 320.3
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