An improved attachment of N-protected amino acid and peptide to chloromethylated polystyrene-divinylbenzene resin.

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N-Protected amino acyl-or peptidyl-resin was prepared in good yield without racemization, when about a half equivalent amount of 1, 5-diaza-bicyclo [4, 3, 0] nonene-5 (DBN) or 1, 8-diaza-bicyclo [5, 4, 0] undecene-7 (DBU) salt of N-protected amino acid or peptide was allowed to react with chloromethylated polystyrene-2%-divinylbenzene resin (chlorine content 0.66 millimole per gram) at 50°for 28 hours. The unchanged chloromethyl group was acetylated quantitatively by the reaction with large excess of DBN salt of acetic acid.

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