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With bromine; triethylamine; In dichloromethane; at 0 - 20℃; for 1.33333h;
Step 2) 2.Og 3-Isobutoxy-4,5,6,6a-tetrahydro-3aH-pentalen-l -one was dissolved in 40 ml DCM. 2.47g Br2 was added drop wise and the mixture was stirred at rt for 20 min. The reaction mixture was cooled to O0C and 3.12 g TEA was slowly added. The cooling bath was removed and the mixture was stirred at rt for 1 h. Filtration and concentration gave a crude product which was purified on silica using 2% MeOH in DCM to produce 2.26 g l-Bromo-2,3-difluoro-4-methoxy-benzene.