Phenyl 5-cyanopyrazin-2-ylcarbamate → Tert-butyl 4-(4-((tert-butoxycarbonyl (2-chloro-4-(3-(5-cyanopyrazin-2-yl) ureido)-5-methoxy-phenethyl)amino)methyl)phenyl)piperazine-1-carboxylate

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Reaction Steps

A stirred solution of tert-butyl-4-(4-(((4-amino-2-chloro-5-methoxyphenethyl)(tert-butoxycarbonyl)amino)methyl)phenyl)piperazine-1-carboxylate (0.46 g, 0.800 mmol) and phenyl 5-cyanopyrazin-2-ylcarbamate (0.153 g, 0.64 mmol) in DMF (18 mL) was heated to 100° C. for 1.5 hours. The mixture was allowed to cool to room temperature, diluted with water (40 mL) and extracted with EtOAc (2×30 mL). The combined organic extracts were washed with water (3×15 mL), brine (10 mL), dried (Na2SO4) and concentrated under reduced pressure. The residue was purified with column chromatography on neutral silica gel using 1.5% methanol in DCM to give the title compound (0.25 g, 43%).

Provenance & Evidence