N-bromobutanimide → 1,1-Dimethylethyl 4-[5-(2-chloro-4-pyrimidinyl)-4-(2-fluoro-3-{[(2-propen-1-yloxy)carbonyl]amino}phenyl)-1,3-thiazol-2-yl]-1-piperidinecarboxylate

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To a solution of 2-propen-1-yl {3-[(2-chloro-4-pyrimidinyl)acetyl]-2-fluorophenyl}-carbamate (1.43 g, 4.09 mmol) in N,N-dimethylacetamide (DMA) (15 mL) was added NBS (0.728 g, 4.09 mmol), and the reaction mixture was stirred for 1 h. 1,1-Dimethylethyl 4-(aminocarbonothioyl)-1-piperidinecarboxylate (0.999 g, 4.09 mmol) was added and the reaction mixture was heated to 80° C. for 25 min. The mixture was cooled, quenched with water (30 mL) and extract with EtOAc (3×). The extract was dried over Na2SO4, filtered and concentrated. The residue was purified using column chromatography (hexane/EtOAc, 0 to 100%) to give 1.34 g of the title compound. MS (ESI): 574.2 [M+1]+.

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