[EN] REACTIONS OF OLEFIN DERIVATIVES IN THE PRESENCE OF METATHESIS CATALYSTS<br/>[FR] RÉACTIONS DE DÉRIVÉS OLÉFINIQUES EN PRÉSENCE DE CATALYSEURS DE MÉTATHÈSE
申请人:UMICORE AG & CO KG
公开号:WO2019158485A1
公开(公告)日:2019-08-22
The invention provides a method for synthesizing musk macrocycles comprising contacting an easily accessible diene starting materials bearing a Z-olefin moiety and performing a ring closing metathesis reaction in the presence of a Group 8 olefin metathesis catalyst.
Stereoselectivity of Macrocyclic Ring-Closing Olefin Metathesis
作者:Choon Woo Lee、Robert H. Grubbs
DOI:10.1021/ol006059s
日期:2000.7.1
[reaction: see text] Macrocyclicring-closingolefinmetathesis using ruthenium catalyst 3 was performed to produce a 14-membered lactone. The E/Z ratio of lactone was high regardless of the R group (auxiliary) or the initial alkene stereochemistry. A kinetic study demonstrates that the high E/Z ratio is due to secondary metathesis reactions that isomerize the product to the thermodynamic E/Z ratio
[EN] A HIGHLY EFFICIENT SYNTHESIS OF Z-MACROCYCLES USING STEREORETENTIVE, RUTHENIUM-BASED METATHESIS CATALYSTS<br/>[FR] SYNTHÈSE HAUTEMENT EFFICACE DE MACROCYCLES Z À L'AIDE DE CATALYSEURS DE MÉTATHÈSE À BASE DE RUTHÉNIUM STÉRÉORÉTENTIFS
申请人:CALIFORNIA INST OF TECHN
公开号:WO2018208501A1
公开(公告)日:2018-11-15
A highly efficient, Z-selective ring-closing metathesis system for the formation of macrocycles using a stereoretentive, ruthenium-based catalyst supported by a dithiolate ligand is reported. This catalyst is demonstrated to be remarkably active as observed in initiation experiments showing complete catalyst initiation at - 20°C within 10 min. Using easily accessible diene starting materials bearing a Z-olefin moiety, macrocyclization reactions generated products with significantly higher Z-selectivity in appreciably shorter reaction times, in higher yield, and with much lower catalyst loadings than in previously reported systems. Macrocyclic lactones ranging in size from twelve-mem bered to seventeen-membered rings are synthesized in moderate to high yields (68 - 79% yield) with excellent Z-selectivity (95% - 99% Z).
Highly efficient synthesis of z-macrocycles using stereoretentive, ruthenium-based metathesis catalysts
申请人:CALIFORNIA INSTITUTE OF TECHNOLOGY
公开号:US11053209B2
公开(公告)日:2021-07-06
A highly efficient, Z-selective ring-closing metathesis system for the formation of macrocycles using a stereoretentive, ruthenium-based catalyst supported by a dithiolate ligand is reported. This catalyst is demonstrated to be remarkably active as observed in initiation experiments showing complete catalyst initiation at −20° C. within 10 min. Using easily accessible diene starting materials bearing a Z-olefin moiety, macrocyclization reactions generated products with significantly higher Z-selectivity in appreciably shorter reaction times, in higher yield, and with much lower catalyst loadings than in previously reported systems. Macrocyclic lactones ranging in size from twelve-membered to seventeen-membered rings are synthesized in moderate to high yields (68-79% yield) with excellent Z-selectivity (95%-99% Z).
报告中介绍了一种高效的 Z 选择性闭环偏析系统,该系统使用了一种由二硫酸盐配体支持的立体定向钌基催化剂,用于形成大环。在引发实验中观察到,这种催化剂具有显著的活性,在 -20°C 温度下 10 分钟内就能完全引发。使用含有 Z-烯烃分子的易得二烯起始材料,大环化反应生成了 Z 选择性更高的产物,与之前报道的体系相比,反应时间明显更短、产率更高、催化剂负载量更低。合成的大环内酯大小从十二元环到十七元环不等,收率从中等到较高(68-79%),Z 选择性极佳(95%-99% Z)。
Reactions of olefin derivatives in the presence of methathesis catalysts
申请人:Umicore AG & Co. KG
公开号:US11161104B2
公开(公告)日:2021-11-02
The invention provides a method for synthesizing musk macrocycles comprising contacting an easily accessible diene starting materials bearing a Z-olefin moiety and performing a ring closing metathesis reaction in the presence of a Group 8 olefin metathesis catalyst.