Bromine → 7-Bromothieno[3,2-d]pyrimidine-2,4(1h,3h)-dione

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To 100 mL glass tube containing thieno[3,2-d]pyrimidin-2,4-dione 4 (5.88 g, 34.86 mmol), AcOH (60 mL) and bromine (3.6 mL, 69.72 mmol) were added and the tube capped. The sealed tube was stirred in a preheated oil bath at 90° C. for 24 h. An additional portion of bromine (3.6 mL, 69.72 mmol) was added to the sealed tube and mixture stirred for another 24 h at 90° C. The AcOH was evaporated to obtain a solid residue to which water was added (200 mL) and the suspension filtered and residue washed repeatedly with water and dried under vacuum to obtain 8 as an off-white solid (8.07 g, 32.67 mmol, 94%). Mp 251.0-252.9° C. 1H NMR (400 MHz, DMSO-d6): δ 8.22 (s, 1H), 11.40 (br s, 1H, NH), 11.58 (br s, 1H, NH). 13C NMR (100 MHz, DMSO-d6): δ 99.6, 112.1, 133.4, 145.1, 152.1, 159.0. FAB-MS m/z for C6H3BrN2O2S calculated [M+H]+ 246.9171. found 246.9175 (79Br), 248.9161 (81Br).

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