4-Methylmorpholine → Ethyl 2-[(4-tert-butoxy-4-oxobutanoyl)amino]-3-oxobutanoate

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

4-Tert-butoxy-4-oxobutanoic acid (1.7 g) and N-methylmorpholine (1.1 mL) were dissolved in tetrahydrofuran (60 mL), and the solution was cooled to 0° C. Isobutyl chloroformate (1.3 mL) was added thereto, and the mixture was stirred at 0° C. for 30 minutes. A solution of ethyl 2-amino-3-oxobutanoate hydrochloride (1.8 g) in N,N-dimethylformamide (30 mL) was added thereto, and the mixture was stirred at 0° C. for 5 minutes. Then, N-methylmorpholine (1.1 mL) was added thereto, and the mixture was stirred at room temperature for 20 hours. Ethyl acetate was added to the reaction solution, and the organic layer was washed with water and dried over sodium sulfate. The solvent was distilled off under reduced pressure, and the obtained residue was purified by silica gel column chromatography (Moritex Corporation, elution solvent: hexane/ethyl acetate) to obtain the title compound (2.2 g) as a yellow oil (yield: 72%).

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