N-bromobutanimide → cis-4-[5-Bromo-6-(2-methyl-3-furanyl)-2-pyridinyl]-2,6-dimethylmorpholine

N-Bromosuccinimide (137 mg, 0.771 mmol) was added portionwise to a solution of cis-2,6-dimethyl-4-[6-(2-methyl-3-furanyl)-2-pyridinyl]morpholine (210 mg, 0.771 mmol) in chloroform (7 mL) at 0° C. The reaction was stirred at 0° C. for 1 hour. Crude LC/MS showed desired product can be seen and no starting material left, so the reaction mixture was diluted with ethyl acetate (20 mL) and washed with water (10 mL), brine (10 mL), water (10 mL) and brine (10 mL). The organic layer was dried (sodium sulfate), filtered and concentrated under reduced pressure. The residue was dissolved in dichloromethane (˜10 ml) and purified on silica by a Biotage SP4 chromatographic system (40+S cartridge, eluted with 0-100% ethyl acetate in isohexanes). Fractions containing pure product were combined and concentrated under reduced pressure to give the title compound as a colourless oil (280 mg, 0.678 mmol, 88% yield). LC/MS [M+H]+=351/353.