Chlorosuccinimide → tert-Butyl 4-{4-[5-(2-nitrophenyl)-4,5-dihydro-1,2-oxazol-3-yl]-1,3-thiazol-2-yl}piperidine-1-carboxylate

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To a solution of tert-butyl 4-{4-[(hydroxyimino)methyl]-1,3-thiazol-2-yl}piperidine-1-carboxylate (2.80 g) and 1-nitro-2-vinylbenzene (1.60 g) in ethyl acetate (50 ml) were added, at room temperature, potassium hydrogencarbonate (4.50 g) and N-chlorosuccinimide (1.44 g) and then one drop of water. After stirring at 60° C. overnight, the reaction mixture was admixed with ethyl acetate and water and extracted with ethyl acetate. The organic extracts were dried over sodium sulphate and concentrated under reduced pressure. The residue was purified by chromatography. This gave tert-butyl 4-{4-[5-(2-nitrophenyl)-4,5-dihydro-1,2-oxazol-3-yl]-1,3-thiazol-2-yl}piperidine-1-carboxylate (2.10 g).

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