V. А. Haidukevich, L. Popova, P. Kurman
Aug 28, 2020
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Abstract
3-benzyl-6-isobutylpiperazin-2,5-dione [cyclo(leucylphenylalanyl)], 3-isobutylpiperazin-2,5-dione [cyclo(-leucylglycyl)] and 3-(sec-butyl-)-6-isobutyl-piperazine-2,5-dione [cyclo(leucylisoleucine)] have been obtained by cyclization of methyl esters of tert-butyloxycarbonyl derivatives of dipeptides, for the synthesis of which both carbodiimide-promoted peptide bond formation and the mixed anhydride method were used.