Total Synthesis of Phorboxazole A via <i>de Novo</i> Oxazole Formation: Strategy and Component Assembly
作者:Bo Wang、T. Matthew Hansen、Ting Wang、Dimao Wu、Lynn Weyer、Lu Ying、Mary M. Engler、Melissa Sanville、Christopher Leitheiser、Mathias Christmann、Yingtao Lu、Jiehao Chen、Nicholas Zunker、Russell D. Cink、Feryan Ahmed、Chi-Sing Lee、Craig J. Forsyth
DOI:10.1021/ja108906e
日期:2011.2.9
The phorboxazole natural products are among the most potent inhibitors of cancer cell division, but they are essentially unavailable from natural sources at present. Laboratory syntheses based upon tri-component fragment coupling strategies have been developed that provide phorboxazole A and analogues in a reliable manner and with unprecedented efficiency. This has been orchestrated to occur via the
佛盒唑天然产物是癌细胞分裂最有效的抑制剂之一,但目前基本上无法从天然来源获得。已经开发了基于三组分片段偶联策略的实验室合成,以可靠的方式和前所未有的效率提供佛盒唑 A 和类似物。这是通过从两个丝氨酸衍生的酰胺依次或同时形成天然产物的两个恶唑部分来进行的,包括氧化-环化脱水。已经开发了代表碳 3-17、18-30 和 31-46 的三种预组装组件的优化制备。本文详细介绍了这三个基本构建块的设计和综合。
Enantioselective Total Synthesis of Peloruside A: A Potent Microtubule Stabilizer
作者:Arun K. Ghosh、Xiaoming Xu、Jae-Hun Kim、Chun-Xiao Xu
DOI:10.1021/ol703091b
日期:2008.3.1
An enantioselectivetotalsynthesis of (+)-peloruside A (1) is described. Peloruside A (1) is a potent microtubule stabilizer with significant clinical potential. The synthesis is convergent and involves the assembly of C1-C10 segment 2 and C11-C24 segment 3 by a novel aldol protocol followed by Yamaguchi macrolactonization of the resulting seco-acid, selective methylation of hemi-ketal and removal
Hydrogen bonds can play a prominent role in organometallic catalysis, as shown for the title reaction, in which a counteranion directs the cyclization through the formation of hydrogen bonds that likely involve a proton of the π‐allyl/palladium species itself. The reaction allows access to four out of the eight stereoisomers of 2,5‐disubstitued 3‐hydroxy‐tetrahydrofurans and thus fragments of complex
Total Synthesis of (+)-Oocydin A: Application of the Suzuki–Miyaura Cross-Coupling of 1,1-Dichloro-1-alkenes with 9-Alkyl 9-BBN
作者:Emmanuel Roulland
DOI:10.1002/anie.200800585
日期:2008.5.5
The first total synthesis of naturally occurring (+)-gymnasterkoreayne F and its enantiomer
作者:Adriano Carpita、Silvia Braconi、Renzo Rossi
DOI:10.1016/j.tetasy.2005.06.015
日期:2005.7
The first total synthesis of naturally occurring (+)-gymnasterkoreayne F and its enantiomer is reported. The seven-step route to these two polyacetylenes in enantiomerically pure form involves the use of (+)-2,3-O-isopropylidene-L-threitol and (-)-2,3-O-isopropylidene-D-threitol, respectively, as the starting material and a Cadiot-Chodkiewicz reaction as a key step. The absolute configuration of (+)-gymnasterkoreayne F has been confirmed to be (2E,8S,Z). The natural product and its enantiomer have been found to exhibit modest cytotoxicity against the 60 human tumor cell lines of the National Cancer Institute. (C) 2005 Elsevier Ltd. All rights reserved.