Synthesis and X-ray Crystal Structure of the <i>Dolabella </i><i>a</i><i>uricularia</i> Peptide Dolastatin 18<sup>,</sup><sup>1</sup>
作者:George R. Pettit、Fiona Hogan、Delbert L. Herald
DOI:10.1021/jo030358o
日期:2004.6.1
(Doe, 3), was converted in four steps to tripeptide 10. Subsequent condensation with carboxylic acid 11 (four steps from Meldrum's acid) provided a practical synthesis of the cancer cell growth inhibitor dolastatin 18 (2, Dhex-(S)-Leu-(R)-N-Me-Phe-Doe). The synthesis of dolastatin 18 (2) confirmed the R stereochemistry of the N-Me-Phe unit as originally assigned and unusual among amino acid components
通过四个步骤将先前合成的dolastatin 10 (1)单元,多拉芬宁(Doe,3)转化为三肽10。随后与羧酸11的缩合(距离Meldrum的酸四个步骤)提供了癌细胞生长抑制剂dolastatin 18(2,Dhex-(S)-Leu-(R)-N -Me-Phe-Doe)的实用合成方法。dolastatin 18 (2)的合成证实了N -Me-Phe单元的R立体化学是最初分配的,在海兔Dolabella auricularia的氨基酸成分中并不常见。Dolastatin 18的X射线晶体结构测定也已完成。