1,1'-Oxybis(4-nitrobenzene) → HCID 178512875, Verbindung

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To a solution of 37 g (0.1 mol) of p-nitrophenyl ether of benzyloxycarbonylproline in 360 ml of dioxane there is added a solution of 16 g (0.09 mole) of arginine in 160 ml of water under vigorous stirring. After two hours the solvent is evaporated and the residue is dissolved in 100 ml of dimethylformamide. The solution is stirred at room temperature (25° C.) for 72 hours and then poured into 1 liter of ethylacetate. After residence of the reaction mixture for 12 hours in a cooler the resulting precipitate is filtered-off, washed on the filter with ethylacetate and diethyl ether. After recrystallization of the product from a mixture of ethanol-diethyl ether (1:5) there are obtained 35 g (96%) of benzyloxycarbonyl-prolyl-arginine having the following properties: melting point 137°-140° C., [L]D20 -46.6° (c 1.0; H2O); Rf 0.53 (A, "Eastman"); 0.66 (B, "Eastman"), Ehis 0.56 (pH 2.4).

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