Br[CH:2]1[C:7](=[O:8])[CH2:6][CH:5]([CH3:9])[CH2:4][C:3]1=O.C([O-])(=O)C.[Na+].[NH2:16][C:17]([NH2:19])=[S:18]>C(O)(=O)C>[NH2:19][C:17]1[S:18][C:2]2[C:7](=[O:8])[CH2:6][CH:5]([CH3:9])[CH2:4][C:3]=2[N:16]=1To a solution of 24 in acetic acid (540 mL) was added sodium acetate (44.3 g, 540 mmol) and thiourea (28.8 g, 378 mmol). The reaction mixture was stirred with a mechanical stirrer at 100° C. for 3 h. The reaction mixture was partially concentrated in vacuo. EtOAc was added (500 mL). The mixture was made basic with 1 M NaOH, and the layers were separated. The aqueous layer was extracted with EtOAc (2×300 mL). The combined organic layers were dried, filtered, and concentrated in vacuo to give 49.3 g of 25, which was taken on without further purification. LCMS-ESI+: calc'd for C8H11N2OS: 183.1 (M+H+); Found: 183.1 (M+H+).
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