描述了使用基于钌的复分解催化剂的 Z 选择性大环化的第一份报告。对于具有各种官能团和环大小的多种底物,Z 大环的选择性始终很高。同样的催化剂也用于 E 和 Z 大环混合物的 Z 选择性乙烯醇解,提供纯 E 异构体。值得注意的是,只需要 1 个大气压的乙烯压力。这些方法已成功应用于几种嗅觉大环化合物的构建以及细胞毒性生物碱莫托泊明 C 的正式全合成。
Fluorinated Musk Fragrances: The CF<sub>2</sub>Group as a Conformational Bias Influencing the Odour of Civetone and (<i>R</i>)-Muscone
作者:Ricardo Callejo、Michael J. Corr、Mingyan Yang、Mingan Wang、David B. Cordes、Alexandra M. Z. Slawin、David O'Hagan
DOI:10.1002/chem.201600519
日期:2016.6.6
over edge locations in aliphatic macrocycles. In this study, the CF2 group has been introduced into musk relevant macrocyclic ketones. Nine civetone and five muscone analogues have been prepared by synthesis for structure and odour comparisons. X‐ray studies indeed show that the CF2 groups influence ring structure and they give some insight into the preferred ring conformations, triggering a musk odour
Continuous Flow
<i>Z</i>
‐Stereoselective Olefin Metathesis: Development and Applications in the Synthesis of Pheromones and Macrocyclic Odorant Molecules**
作者:Jennifer Morvan、Tom McBride、Idriss Curbet、Sophie Colombel‐Rouen、Thierry Roisnel、Christophe Crévisy、Duncan L. Browne、Marc Mauduit
DOI:10.1002/anie.202106410
日期:2021.9
The first continuous flow Z-selective olefinmetathesis process is reported. Key to realizing this process was the adequate choice of stereoselective catalysts combined with the design of an appropriate continuous reactor setup. The designed continuous process permits various self-, cross- and macro-ring-closing-metathesis reactions, delivering products in high selectivity and short residence times
报道了第一个连续流动 Z-选择性烯烃复分解过程。Key to realizing this process was the adequate choice of stereoselective catalysts combined with the design of an appropriate continuous reactor setup. 设计的连续工艺允许各种自、交叉和大环闭环复分解反应,以高选择性和短停留时间提供产品。该技术通过直接应用于一系列信息素和大环气味分子的制备来举例说明,并在一个伸缩的 Z 选择性交叉复分解/迪克曼环化序列中达到高潮,以获取 ( Z )-Civetone,并结合一系列连续搅拌罐反应堆。
Highly selective macrocyclic ring-closing metathesis of terminal olefins in non-chlorinated solvents at low dilution
A set of new ruthenium–indenylidenecomplexes bearing two unsymmetrical unsaturated N-cycloalkyl-NHC ligands were synthesized. These catalysts proved to be highly selective in the macrocyclic ring-closing metathesis performed in non-chlorinated solvents at low dilution (0.01 M). Without the requirement of benzoquinone derivatives to prevent the isomerisation side reactions, this environmentally friendly
The synthesis of macrocycles is severely impeded by concomitant oligomer formation. Here, we present a biomimetic approach that utilizes spatial confinement to increase macrocyclization selectivity in the ring clos-ing metathesis of various dienes at elevated substrate concentration up to 25 mM using an olefin me-tathesis catalyst selectively immobilized inside ordered mesoporous silicas with defined