[Br:1][C:2]1[CH:3]=[C:4]([CH:9]=[C:10]([Br:13])[C:11]=1[OH:12])[C:5]([O:7][CH3:8])=[O:6].CN1CCOCC1.Cl[C:22]([S:24][C:25]1[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=1)=[S:23]>C1COCC1.CCOC(C)=O>[Br:1][C:2]1[CH:3]=[C:4]([CH:9]=[C:10]([Br:13])[C:11]=1[O:12][C:22]([S:24][C:25]1[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=1)=[S:23])[C:5]([O:7][CH3:8])=[O:6]Methyl 3,5-dibromo-4-hydroxybenzoate (1000 mg, 3.23 mmol) was dissolved in THF (16 mL) and N-methylmorpholine (0.709 mL, 6.45 mmol) was added. The mixture was cooled to 0° C. and phenyl chlorodithioformate (0.549 mL, 3.87 mmol) was added. The mixture was warmed to room temperature and stirred overnight. The mixture was diluted with EtOAc and washed with water. The organic layer was dried over Na2SO4, filtered and concentrated. The residue was purified by silica gel chromatography (0-15% EtOAc/hexanes) to yield the title compound as a clear oil (1491 mg).
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