Amino-acids and peptides. Part XXVII. Further studies on esters of 1-hydroxypiperidine
作者:J. H. Jones、G. T. Young
DOI:10.1039/j39680000053
日期:——
Acylamino-acid 1-piperidyl esters have been obtained in a high state of purity by the use of ‘Reagent K’[3-(2-ethyl-5-isoxazolio)benzenesulphonate], and new esters prepared by this and by previously known methods are reported. Standard recemisation tests showed that the new procedure gave an optically pure ester from benzyloxycarbonylglycyl-L-phenylalanine, but some racemate was formed from benzoyl-L-leucine
Amino-acids and peptides. Part XXVI. The use of 1-piperidyl esters in peptide synthesis: further studies
作者:J. H. Jones、B. Liberek、G. T. Young
DOI:10.1039/j39670002371
日期:——
Further examples of the use of 1-piperidyl esters for the synthesis of protected dipeptides have given good yields of pure product except when two valine residues were involved (in which case the reaction of the analogous p-nitrophenyl ester was also very slow), or when one residue was α-aminoisobutyric acid. The reactions of benzyloxy-carbonylamino-acid 1-piperidyl esters with the methyl esters of