Br[C:2]1[CH:3]=[CH:4][C:5]2[O:10][CH:9]([CH3:11])[C:8](=[O:12])[NH:7][C:6]=2[CH:13]=1.[S:14]1[CH:18]=[CH:17][CH:16]=[C:15]1B(O)O.C(=O)(O)[O-].[Na+]>COCCOC.C(OCC)(=O)C>[S:14]1[CH:18]=[CH:17][CH:16]=[C:15]1[C:2]1[CH:3]=[CH:4][C:5]2[O:10][CH:9]([CH3:11])[C:8](=[O:12])[NH:7][C:6]=2[CH:13]=1
315 mg of 6-bromo-2-methyl-1,4-benzoxazin-3-(4H)-one is mixed in 4 ml of DME with 0.2 g of 2-thiopheneboronic acid and 150 mg of tetrakis-triphenylphosphine-palladium (O) and 340 mg of sodium bicarbonate (dissolved in 4 ml of water). It is stirred for some time at 100° C. The product is diluted with ethyl acetate, extracted 3 times with water, and dried with magnesium sulfate. It is concentrated by evaporation. The crude product is purified by column chromatography with a hexane/ethyl acetate mixture and yields pure 33% product.
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