Water → (4aS,5R,7aS)-5-Methyl-7a-(2',4,5'-trifluoro-[1,1'-biphenyl]-3-yl)-4a,5,7,7a-tetrahydro-4H-furo[3,4-d][1,3]thiazin-2-amine

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tert-Butyl[(4aS,5R,7aS)-7a-(5-bromo-2-fluorophenyl)-5-methyl-4a,5,7,7a-tetrahydro-4H-furo[3,4-d][1,3]thiazin-2-yl]imidodicarbonate (0.15 g, 0.34 mmol) was dissolved in 1,2-dimethoxyethane (1.5 mL), water (0.7 mL) and ethanol (0.5 mL). The resulting solution was heated to 100° C. and to it was added (2,5-difluorophenyl)boronic acid (0.11 g, 0.67 mmol), cesium carbonate (0.659 g, 2.02 mmol) and dichloropalladium-triphenylphosphane (0.047 g, 0.067 mmol) and the reaction was stirred at 100° C. After 1 hour, the reaction mixture was cooled to room temperature, diluted with saturated aqueous NaHCO3 and extracted with EtOAc (×3). The combined organic layers were dried (MgSO4), filtered and concentrated in vacuo. The residue was dissolved in DCM (2 mL) and trifluoroacetic acid (2 mL). After 1 hour, the solvents were removed in vacuo. The residue was neutralised with saturated aqueous NaHCO3 and extracted with DCM (×2). The combined organic layers were dried (MgSO4), filtered and concentrated. The residue was purified using column chromatography (gradient 0-15% MeOH in EtOAc) to give the title compound (18 mg, colourless solid). 1H NMR (400 MHz, CDCl3) δ ppm: 7.50-7.58 (m, 2 H), 7.09-7.2 (m, 3 H), 6.97-7.06 (m, 1 H), 4.61 (d, J=10.1 Hz, 1 H), 4.35-4.47 (m, 1 H), 4.21 (dd, J=10.0, 1.6 Hz, 1 H), 3.28 (dd, J=13.5, 3.7 Hz, 1 H), 3.03 (dt, J=8.1, 4.0 Hz, 1 H), 2.91 (dd, J=13.6, 4.0 Hz, 1 H), 1.44 (d, J=6.1 Hz, 3 H)

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