Mafenide → N-(2-[(2,3-Difluorobenzyl)thio]-6-methoxypyrimidin-4-yl)-4-(aminomethyl)benzenesulfonamide

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A mixture of 4-(aminomethyl)benzenesulfonamide (0.37 g), tris(dibenzylideneacetone)dipalladium (0) (50 mg), 2-dicyclohexylphosphino-2′,4′,6′-tri-isopropyl-1,1′-biphenyl (XPHOS) (50 mg), cesium carbonate (1.0 g) and, 4-Chloro-2-[[(2,3-difluorophenyl)methyl]thio]-6-methoxypyrimidine (the product from example 35 step i), (0.25 g) in dioxane (20 ml) was heated at reflux in a microwave at 100° C., 300 W, open vessel with cooling for 3 h. The reaction mixture was then reduced in vacuo and the residue partitioned between DCM (150 ml) and H2O (150 ml). The organics were separated and the aqueous layer was re-extracted with DCM (2×150 ml). Organics were combined, dried (MgSO4) and reduced in vacuo to give a yellow solid. This solid was then purified by prep HPLC to give the title compound as a white solid. Yield: 19 mg

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