Efficient Synthesis of 3-Chloromethyl-2(5<i>H</i>)-furanones and 3-Chloromethyl- 5,6-dihydropyran-2-ones via the PdCl<sub>2</sub>-Catalyzed Chlorocyclocarbonylation of 2,3- or 3,4-Allenols
作者:Xin Cheng、Xuefeng Jiang、Yihua Yu、Shengming Ma
DOI:10.1021/jo8015677
日期:2008.11.21
was formed between the center carbon atom of the allene moiety and the hydroxyl oxygen, which was established by the X-ray single crystal diffraction study of gamma-lactone 3p. The highly opticallyactive 3-chloromethyl-2(5H)-furanones could be easily prepared from the readily available opticallyactive 2,3-allenols. A mechanism for this reaction was proposed.
Total Synthesis of Lepadiformine Alkaloids using <i>N</i>-Boc α-Amino Nitriles as Trianion Synthons
作者:Matthew A. Perry、Matthew D. Morin、Brian W. Slafer、Scott D. Rychnovsky
DOI:10.1021/jo300161x
日期:2012.4.6
synthesized in an enantiomerically pure form using a reductive cyclization strategy. N-Boc α-amino nitriles were deprotonated and alkylated with enantiomerically pure dibromides to afford the first ring. The products were manipulated to introduce phosphate leaving groups, and subsequent reductive lithiation followed by intramolecular alkylation formed the second ring with high stereoselectivity. The third
Lepadiformine A、B 和 C 是使用还原环化策略以对映体纯形式合成的。N -Boc α-氨基腈被去质子化并用对映体纯二溴化物烷基化以提供第一个环。操纵产物以引入磷酸盐离去基团,随后的还原锂化和分子内烷基化形成具有高立体选择性的第二个环。第三个环是通过去保护的胺分子内置换甲磺酸盐形成的。Lepadiformine A 和 B 含有一个与胺相邻的羟甲基。使用 Polonovski-Potier 反应作为关键步骤,按顺序引入该附属物。合成策略具有立体选择性和收敛性,并证明了N的效用-Boc α-氨基腈作为生物碱合成的关键。
[EN] A KIT FOR DETERMINING THE ABSOLUTE CONFIGURATION OF ALCOHOLS USING A COMPETING ENANTIOSELECTIVE CONVERSION APPROACH<br/>[FR] KIT POUR DÉTERMINER LA CONFIGURATION ABSOLUE D'ALCOOLS À L'AIDE D'UNE APPROCHE DE CONVERSION ÉNANTIOSÉLECTIVE CONCURRENTE
申请人:UNIV CALIFORNIA
公开号:WO2018094293A1
公开(公告)日:2018-05-24
Provided herein is a kit for the determination of the absolute configuration of alcohols of a competing enantioselective conversion approach.
本文提供了一个用于确定竞争对映选择性转化方法中醇的绝对构型的试剂盒。
Nanomole-Scale Assignment and One-Use Kits for Determining the Absolute Configuration of Secondary Alcohols
作者:Alexander J. Wagner、Shawn M. Miller、Ryan P. King、Scott D. Rychnovsky
DOI:10.1021/acs.joc.6b00816
日期:2016.8.5
convenient utilization in the determination of the absoluteconfiguration of secondary alcohols. The first protocol uses the competing enantioselective conversion (CEC) method to determine configuration on nanomole scale. Reactions were conducted with 145 nmol of the substrate using a 50 μL microsyringe as the reaction vessel, and the absoluteconfiguration was assigned via qualitative determination of
开发和优化了两种不同的方案,以满足在确定仲醇的绝对构型时对(1)高灵敏度或(2)方便利用的需求。第一种协议使用竞争对映选择性转化(CEC)方法来确定纳米分子规模的构型。使用50μL微型注射器作为反应容器,以145 nmol的底物进行反应,并通过薄层色谱法对快速反应进行定性确定绝对构型。该方案使以前的CEC方法研究所需的材料减少了50倍。用苄基和β-芳基体系评估了该方法。第二种方案经过优化,可满足从业药物化学家的需求。开发了一种一次性使用的CEC套件,1 H NMR光谱法和薄层色谱法。为微注射器方案开发的CEC反应条件和一次性试剂盒均显示与底物中拟一级动力学一致的数据。因此,对于底物的灵敏度的下限仅受有效检测醇底物与酯产物之间的反应转化的能力的限制。
An Asymmetric Formal Synthesis of Fasicularin
作者:Micha�l D. B. Fenster、Gregory R. Dake
DOI:10.1002/chem.200400749
日期:2005.1.7
An asymmetric formal synthesis of fasicularin (1) is described. This natural product, isolated from the extracts of the marine invertebrate Nephteis fasicularis, has shown modest cytotoxicity towards Vero cells. Fasicularin is among only two members of the cylindricinefamily of natural products, along with lepadiformine (2), to possess a trans A-B ring junction. Key steps of this approach to 1 involve