Cl.Cl[C:3]1[C:12]([CH3:13])=[C:11]2[C:6]([C:7]([NH:17][C:18]3[C:23]4[CH2:24][CH2:25][O:26][C:22]=4[CH:21]=[CH:20][CH:19]=3)=[C:8]([C:14]([NH2:16])=[O:15])[CH:9]=[N:10]2)=[CH:5][CH:4]=1.[CH3:27][S-:28].[Na+].C(=O)([O-])[O-].[K+].[K+].O>CN(C)C=O.[Cu]I>[O:26]1[C:22]2[CH:21]=[CH:20][CH:19]=[C:18]([NH:17][C:7]3[C:6]4[C:11](=[C:12]([CH3:13])[C:3]([S:28][CH3:27])=[CH:4][CH:5]=4)[N:10]=[CH:9][C:8]=3[C:14]([NH2:16])=[O:15])[C:23]=2[CH2:24][CH2:25]1A stirred mixture of Intermediate 104 (0.50 g), sodium methanethiolate (0.35 g), potassium carbonate (0.43 g) and copper (I) iodide (0.025 g) in dry N,N-dimethylformamide (3 ml) was heated at 100° under nitrogen for 18 h. The mixture was cooled, poured into water (50 ml) and stirred for 15 min. The solid material was filtered off, dried in vacuo at 80° for 2 h, and boiled in ethanol:water 15:1 (50 ml) for 30 min. The insoluble material was filtered off, and the filtrate evaporated to dryness to give the title compound as a pale yellow solid (0.163 g).
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