Formal Synthesis of Actin Binding Macrolide Rhizopodin
作者:Kiran Kumar Pulukuri、Tushar Kanti Chakraborty
DOI:10.1021/ol5008179
日期:2014.4.18
Formal synthesis of an actin binding macrolide rhizopodin was achieved in 19 longest linear steps. The key features of the synthesis include a stereoselective Mukaiyama aldol reaction, dual role of a Nagao auxiliary (first, as a chiral auxiliary of choice for installing hydroxy centers and, later, as an acylating agent to form an amide bond with an amino alcohol), late stage oxazole formation, and
The C1–C15 fragment of rhizopodin was synthesized through either Suzuki coupling reaction of vinyl iodide and vinyl boronate or cross-metathesis of a terminal olefin and a diene adduct in the presence of Hoveyda–Grubbs II catalyst.
在 Hoveyda-Grubbs II 催化剂存在下,通过碘乙烯和硼酸乙烯酯的 Suzuki 偶联反应或末端烯烃和二烯加合物的交叉复分解,合成了 Rhizopodin 的 C1-C15 片段。
Synthesis and Biological Evaluation of Phorboxazole Congeners Leading to the Discovery and Preparative-Scale Synthesis of (+)-Chlorophorboxazole A Possessing Picomolar Human Solid Tumor Cell Growth Inhibitory Activity
作者:Amos B. Smith、Thomas M. Razler、Regina M. Meis、George R. Pettit
DOI:10.1021/jo701816h
日期:2008.2.1
Highly convergent syntheses of eight phorboxazole congeners and their evaluation against a diverse panel of human solid tumor cancer cell lines have been achieved. Specifically, the C(45-46) alkyne, alkene, and alkane phorboxazole A analogues [(+)-4-(+)-6] were constructed and found to display single digit nanomolar cell growth inhibitory activities in a series of human cancer cell lines. The structurally simplified C(11-15)-acetal congener (+)-20Z also proved potent albeit reduced (cf. 34.6 nM) when evaluated against the same cell line panel. Importantly, (+)-C(46)-chlorophorboxazole A (3) displayed picomolar (pM) inhibitory activity in several cell lines.