4-Methylmorpholine → Tert-butyl 1-{3-[4-(5-oxo-1,2,4-oxadiazolin-3-yl)phenyl]-2-oxo-5-oxazolidinylcarbonyl}piperidine-4carboxylate

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Reaction Steps

3.03 g of N-methylmorpholine are added to a solution of 2.91 g of 3-[4-(5-oxo-1,2,4-oxadiazolin-3-yl)phenyl]-2-oxo-5-oxazolidinecarboxylic acid [obtainable according to Example 3], 2.77 g of tert-butyl piperidine-4-carboxylate, 2.02 g of 1-hydroxybenzotriazole and 2.86 g of N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide hydrochloride in 20 ml of DMF, and the mixture is stirred at room temperature for 5 h. 200 ml of water are subsequently added dropwise with intensive stirring, the crystalline precipitate formed is separated off and taken up in 90 ml of dichloromethane, and the mixture is dried over Na2SO4. The solution is concentrated in vacuo, and the resulting oil is triturated with diethyl ether to give tert-butyl 1-{3-[4-(5-oxo-1,2,4-oxadiazolin-3-yl)phenyl]-2-oxo-5-oxazolidinylcarbonyl}piperidine-4carboxylate, m.p. 171°-175°.

Provenance & Evidence