Application of Negishi Cross-Coupling to the Synthesis of the Cyclic Tripeptides OF4949-III and K-13
作者:Luca Nolasco、Manuel Perez Gonzalez、Lorenzo Caggiano、Richard F. W. Jackson
DOI:10.1021/jo9018792
日期:2009.11.6
Syntheses of the cyclic tripeptides OF4949-III 1 and K-13 2 are reported, in which the key steps are intermolecular and intramolecular Negishi cross-coupling reactions, respectively. In addition, the synthesis of a protected isomer of K-13 25 is reported. The synthesis of K-13 features a tripeptidic organozinc reagent 11, one of the most highly functionalized such reagents to be described. An O-aryltyrosine