Ethyl 2-chloroacetoacetate → Ethyl cis(+/-)-2-(4-{[(benzyloxy)carbonyl]amino}-3-methoxypiperidin-1-yl)-4-methyl-1,3-oxazole-5-carboxylate

Beteiligte Stoffe

Reaktionsschritte

cis(±)-Benzyl (1-carbamoyl-3-methoxypiperidin-4-yl)carbamate obtained in Example (103b) (0.92 g, 3 mmol), ethyl α-chloroacetoacetate (3.29 g, 20 mmol) and sodium bicarbonate (0.84 g, 10 mmol) were stirred at 120° C. for three hours. The reaction solution was diluted with ethyl acetate, washed with water and brine, and dried over anhydrous magnesium sulfate. Following concentration under reduced pressure, the residue was purified by silica gel column chromatography (elution solvent: ethyl acetate/hexane=1/4, 1/2, 2/1, 4/1) to obtain 0.39 g of the title compound as a light brown solid (27%).

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