[O:1]=[C:2]1[CH:6]([CH2:7][CH2:8][C:9]2[CH:18]=[CH:17][C:16]3[CH2:15][CH2:14][CH2:13][NH:12][C:11]=3[N:10]=2)[CH2:5][CH2:4][N:3]1[CH2:19][C:20]([O:22]CC)=[O:21].[ClH:25]>>[ClH:25].[O:1]=[C:2]1[CH:6]([CH2:7][CH2:8][C:9]2[CH:18]=[CH:17][C:16]3[CH2:15][CH2:14][CH2:13][NH:12][C:11]=3[N:10]=2)[CH2:5][CH2:4][N:3]1[CH2:19][C:20]([OH:22])=[O:21]A stirred mixture of 2-7 (0.45 g, 1.4 mmol) and 6N HCl (10 mL) was heated at 50° C. for 1 h, followed by concentration to give 2-8 as a yellow oil.
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