Synthesis and Application of Stereoretentive Ruthenium Catalysts on the Basis of the M7 and the Ru–Benzylidene–Oxazinone Design
作者:Adrien Dumas、Daniel S. Müller、Idriss Curbet、Loïc Toupet、Mathieu Rouen、Olivier Baslé、Marc Mauduit
DOI:10.1021/acs.organomet.7b00836
日期:2018.3.12
catalysts bearing the dithiocatecholate ligand was synthesiszed on the basis of the M7 and Ru–benzylidene–oxazinone design. The activity of the catalysts was tested in ring-opening cross-metathesisreactions, ring-closing metathesis reactions, cross-metathesisreactions, and self-metathesis reactions using Z- and E-configured starting materials. The desired metathesis products were obtained with moderate to
Catalytic Nucleophilic Allylation Driven by the Water–Gas Shift Reaction
作者:Scott E. Denmark、Zachery D. Matesich、Son T. Nguyen、Selena Milicevic Sephton
DOI:10.1021/acs.joc.7b02658
日期:2018.1.5
of this reactionfrom the initial serendipitous discovery to its general synthetic scope is detailed, highlighting the roles of water, CO, and amine in the generation of a more complete catalytic cycle. The use of unsymmetrical allylic pro-nucleophiles was shown to give preferential product formation through the modulation of reaction conditions. Both (E)-cinnamyl acetate and vinyl oxirane were efficiently
钌与烯丙基亲核试剂的醛催化烯丙基化已被证明是在温和条件下形成碳-碳键的有效方法。此反应从最初的偶然发现到其一般合成范围的演变过程都进行了详细介绍,突出了水,一氧化碳和胺在更完整的催化循环生成中的作用。结果表明,使用不对称的烯丙基亲核亲核试剂可以通过调节反应条件来优先形成产物。(E)-肉桂酸乙酸酯和乙烯基环氧乙烷均有效地用于形成抗支链产物(抗/ syn最高> 20:1 )和E-线性产物(最高> 20:1 E / s )Z)分别与芳香族,α,β-不饱和和脂肪族醛形成高选择性。强调了使反应对映选择性的尝试,包括对苯甲醛高达75:25的对映富集。
[EN] CATALYSTS FOR EFFICIENT Z-SELECTIVE METATHESIS<br/>[FR] CATALYSEURS POUR UNE MÉTATHÈSE Z-SÉLECTIVE EFFICACE
申请人:TRUSTEES BOSTON COLLEGE
公开号:WO2014201300A1
公开(公告)日:2014-12-18
The present application provides, among other things, compounds and methods for metathesis reactions. In some embodiments, provided compounds promote highly efficient and highly Z-selective metathesis. In some embodiments, provided compounds and methods are particularly useful for producing allyl alcohols. In some embodiments, provided compounds have the structure of formula I. In some embodiments, provided compounds comprise ruthenium, and a ligand bonded to ruthenium through a sulfur atom.
High-value alcohols and higher-oxidation-state compounds by catalytic Z-selective cross-metathesis
作者:Ming Joo Koh、R. Kashif M. Khan、Sebastian Torker、Miao Yu、Malte S. Mikus、Amir H. Hoveyda
DOI:10.1038/nature14061
日期:2015.1
high-value compounds by cross-metathesis. The ruthenium complex is prepared from a commercially available precursor and an easily generated air-stable zinc catechothiolate. Transformations typically proceed with 5.0 mole per cent of the complex and an inexpensive reaction partner in 4–8 hours under ambient conditions; products are obtained in up to 80 per cent yield and 98:2 Z:E diastereoselectivity.
烯烃复分解催化剂为生命科学领域的医生和研究人员提供了必不可少的分子。然而,一个持续存在的问题是缺乏直接生成无环 Z 烯丙醇的化学转化,包括含有受阻相邻取代基或反应性功能单元(如苯酚、醛或羧酸)的产品。在这里,我们提出了一种电子改性的二硫化钌催化剂,它可以通过交叉复分解有效地产生这种高价值的化合物。钌配合物由市售前体和易于生成的空气稳定儿茶酚硫醇锌制备。在环境条件下,转化通常在 4-8 小时内以 5.0 摩尔百分比的配合物和廉价的反应伙伴进行;以高达 80% 的产率和 98:2 Z:E 非对映选择性获得产品。该催化剂的使用已在天然抗肿瘤剂 Neopeltolide 的合成以及可再生原料(油酸)向抗真菌剂的一步立体选择性克级转化中得到证明。在这种转化中,新催化剂比常用的二氯钌配合物更有效地促进交叉复分解,表明其效用可能超出 Z 选择性过程。
Stereoretentive Olefin Metathesis Made Easy: In Situ Generation of Highly Selective Ruthenium Catalysts from Commercial Starting Materials
作者:Daniel S. Müller、Idriss Curbet、Yann Raoul、Jérôme Le Nôtre、Olivier Baslé、Marc Mauduit
DOI:10.1021/acs.orglett.8b02943
日期:2018.11.2
The in situ preparation of highly stereoretentive ruthenium-based metathesiscatalysts is reported. This approach completely avoids the isolation of intermediates and air-sensitive catalysts, thus allowing for the rapid access and evaluation of numerous dithiolate Ru catalysts. A procedure was established to perform cross-metathesis reactions without the use of a glovebox, and on a small scale even