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
报道了环状三肽OF4949-III 1和K-13 2的合成,其中关键步骤分别是分子间和分子内Negishi交叉偶联反应。另外,报道了K-13 25的保护的异构体的合成。K-13的合成具有三肽有机锌试剂11,其是待描述的功能最强的此类试剂之一。由S N制备的O-芳基酪氨酸衍生物15Boc-酪氨酸和2-氟苯甲醛之间的Ar反应,然后进行Dakin反应,碘化和甲基化,被用作上述所有合成的通用中间体。迄今为止,这类环状三肽的途径是最短的,并且表明碳锌键对肽衍生物具有较高的官能团耐受性。