Bromine → HCID 22119961, compound

Participants

Reaction Steps

To a solution of 3-[3-(phenylsulfonyl)methyl-1,2-benzisothiazol-5-yl]-1-methyl-6-(trifluoromethyl)-2,4(1H,3H)-pyrimidinedione (0.400 g, 0.000831 mol) in ethyl acetate is added 48% hydrobromic acid (4 drops) followed by bromine in ethyl acetate (0.522 M, 1.67 ml, 0.000872 mol). The resultant mixture is stirred 1.5 hours at reflux. Additional bromine in ethyl acetate (1.67 ml) is added and the resultant mixture is stirred one hour at reflux. The mixture is cooled to room temperature, diluted with ethyl acetate, washed sequentially with 0.1 M sodium sulfite, saturated sodium bicarbonate and brine, dried over anhydrous magnesium sulfate, filtered, and concentrated in vacuo. The residue is chromatographed on silica gel with hexanes:ethyl acetate to give the title compound as a white crystalline solid (0.420 g, 90.1%, mp 182-183° C.) which is identified by NMR spectral analysis.

Provenance & Evidence