通过添加第十个环、分子中心的氧原子与氮原子的交换以及不同的末端残基,重氮酰胺 A (1) 的修订结构为化学合成提供了更具挑战性的分子难题它的前身。在本文中,我们详细介绍了重氮酰胺 A 的首次成功全合成,这项努力不仅验证了其适当的连接性并建立了其以前无法分配的 C-37 手性中心的立体化学,而且还开发了几种新的合成战略和战术。
A Concise Formal Synthesis of Diazonamide A by the Stereoselective Construction of the C10 Quaternary Center
作者:Cheng-Kang Mai、Matthew F. Sammons、Tarek Sammakia
DOI:10.1002/anie.200906318
日期:2010.3.22
Protecting groups are overrated! A formal totalsynthesis of diazonamide A is described. The key step in this synthesis is an intramolecular SNAr reaction between an oxindole and a bromooxazole. Interestingly, this reaction proceeds best using the mild base Na2CO3, and with no protecting groups on the oxindole nitrogen atom or phenol groups of the cyclization precursor.
保护团体被高估了!描述了重氮酰胺 A 的正式全合成。该合成的关键步骤是羟吲哚和溴恶唑之间的分子内 S N Ar 反应。有趣的是,该反应最好使用弱碱 Na 2 CO 3 进行,并且环化前体的羟吲哚氮原子或酚基团上没有保护基团。
An Expedient Formal Total Synthesis of (−)-Diazonamide A via a Powerful, Stereoselective <i>O</i>-Aryl to <i>C</i>-Aryl Migration To Form the C10 Quaternary Center
作者:Chi-Ming Cheung、Frederick W. Goldberg、Philip Magnus、Claire J. Russell、Rachel Turnbull、Vince Lynch
DOI:10.1021/ja0744448
日期:2007.10.1
During the course of studies on the synthesis of diazonamide A 1, an unusual O-aryl into C-aryl rearrangement was discovered that allows partial control of the absolute stereochemistry of the C-10 quaternary stereogenic center. Treatment of 30 with TBAF/THF gave the O-tyrosine ethers 31 and 32 (1:1), which on heating each separately in chloroform at reflux rearranged to 33 and 34 in ratios of 84:16
Chemistry and Biology of Diazonamide A: First Total Synthesis and Confirmation of the True Structure
作者:K. C. Nicolaou、David Y.-K. Chen、Xianhai Huang、Taotao Ling、Marco Bella、Scott A. Snyder
DOI:10.1021/ja040092i
日期:2004.10.1
a nitrogen in the heart of the molecule, and a different terminal residue, the revised architecture for diazonamide A (1) provided an even more challenging molecular puzzle for chemical synthesis than its predecessor. In this article, we detail the first successful totalsynthesis of diazonamide A, an endeavor which not only verified its proper connectivities and established the stereochemistry of
通过添加第十个环、分子中心的氧原子与氮原子的交换以及不同的末端残基,重氮酰胺 A (1) 的修订结构为化学合成提供了更具挑战性的分子难题它的前身。在本文中,我们详细介绍了重氮酰胺 A 的首次成功全合成,这项努力不仅验证了其适当的连接性并建立了其以前无法分配的 C-37 手性中心的立体化学,而且还开发了几种新的合成战略和战术。
Total Synthesis of Diazonamide A
作者:K. C. Nicolaou、Marco Bella、David Y.-K. Chen、Xianhai Huang、Taotao Ling、Scott A. Snyder