Triethylamine → D-Serine N-(2-methylthio-2,4-dimethylpentan-3-yl)amide

Beteiligte Stoffe

Reaktionsschritte

To a solution of 3.47 g. (0.017 mole) of N-t-butoxycarbonyl-D-serine and 2.5 g. (0.017 mole) triethylamine in 100 ml. of tetrahydrofuran at -15° C. is added 1.63 ml. of ethyl chloroformate. After stirring for 15 minutes, 2.49 g. (0.017 mole) 2-methylthio-2,4-dimethyl-3-aminopentane is added and the mixture stirred for one hour. The reaction mixture is diluted with ethyl acetate, washed with water, 5% aqueous citric acid (w/v), sodium bicarbonate solution and brine. The organic phase is evaporated to dryness. The residue is taken up in 100 ml. methanol, 60 ml. of concentrated hydrochloric acid added and the mixture refluxed for one hour. After evaporation of methanol, the residue is taken up in water, washed with ether, the aqueous phase adjusted to pH 12 with sodium hydroxide and extracted with ethyl ether. Evaporation of the extracts affords the desired D-serine amide.

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