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。
CATALYSTS FOR EFFICIENT Z-SELECTIVE METATHESIS
申请人:Trustees of Boston College
公开号:US20140371454A1
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.
The present application relates to silicone compounds, compositions, packaged products and displays comprising such silicone compounds, and processes for making and using such compositions, packaged products and displays comprising such compositions. Such compositions have improved deposition and retention properties that may impart improved benefit characteristics to a composition and/or situs yet which changes its hydrophilicity/charge when desired. Such silicone compounds solve the further problem of malodor reduction as, in addition to maldor masking, such compounds block a malodor's access to a sensory cell, yet leave such sensor cell open to other molecules, for example scent molecules. Thus, the malodor control technologies disclosed herein do not unduly interfere with the scent of the perfumed or unperfumed situs that is treated with the malodor control technology.
US9938253B2
申请人:——
公开号:US9938253B2
公开(公告)日:2018-04-10
[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.