A study of the <i>cis</i>–<i>trans</i> isomerization preference of <i>N</i>-alkylated peptides containing phosphorus in the side chain and backbone
作者:Alexander F. de la Torre、Akbar Ali、Odette Concepcion、Ana L. Montero-Alejo、Francisco M. Muñiz、Claudio A. Jiménez、Julio Belmar、José Luis Velázquez-Libera、Erix W. Hernández-Rodríguez、Julio Caballero
DOI:10.1039/c9nj02234a
日期:——
work provides a study on the cis–trans isomerization behaviour of N-alkylated peptides decorated with phosphonate estergroups. A Ugi four-component reaction was chosen for the synthesis of N-alkylated peptides, where almost only the cis isomer was detected when the phosphonate estergroup was incorporated as an amine component in the side chain. However, the phosphonate estergroup inserted in the
An efficient metal-free synthesis of carbodiimide-tethered amino acid conjugates
作者:Srinivasulu Chinthaginjala、Divya Kuppi Reddy Gari、Sagar Nagamangala Ramachandra、Vommina V. Sureshbabu
DOI:10.1080/00397911.2020.1769132
日期:2020.7.17
straightforward oxidative cross-coupling synthesis of carbodiimide tethered amino acid conjugates from amino acid-derived isocyanides and arylaminesmediated by I2/tert-butyl hydroperoxide. Using this protocol, the title compounds were obtained in good isolated yields. This protocol is of short reaction duration, base-free, racemization free and avoids the necessity of transitionmetal catalysts. Graphical Abstract