6-bromo-2,2-dimethyl-4-(1,3-dithian-2-yl)-2H-1,3-benzoxazine → 2-(6-bromo-2,2-dimethyl-2H-1,3-benzoxazin-4-yl)-1,3-dithian-1-oxide

Beteiligte Stoffe

Reaktionsschritte

A solution of sodium periodate (430 mg) in water (6 ml) was added to a solution of Compound 105 (600 mg) in methanol (18 ml) and the mixture was stirred at room temperature for 18 hours. The methanol was distilled off under reduced pressure and the residue was extracted with ethyl acetate. The ethyl acetate layer was washed with aqueous saline solution and dried over anhydrous magnesium sulfate. The solvent was distilled off. The residue was purified by chromatography on silica gel to obtain a solid. The solid was recrystallized from ethyl acetate to obtain 2-(6-bromo-2,2-dimethyl-2H-1,3-benzoxazin-4-yl)-1,3-dithian-1-oxide (331 mg) (Compound 111).

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