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6-(Cyclohex-2-enyl)-1,3-dimethyl-5-hydroxyuracil when treated with bromine in chloroform at 0–5°C for 6h furnishes 6-bromo-1,3-dimethylhexahydrobenzofuro[3,2-d]pyrimidine-2,4-dione in 80% yield. The same heterocycle is also obtained in 90% yield on treatment of the same substrate with pyridine hydrobromide perbromide for 30min or with hexamethylenetetramine hydrotribromide for 15min in methylene chloride...
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