Low Catalyst Loading in Ring-Closing Metathesis Reactions
作者:Renat Kadyrov
DOI:10.1002/chem.201202207
日期:2013.1.14
conversion into a broad variety of 5–16‐membered heterocyclic compounds. The practicality of this procedure was illustrated in the synthesis of 5–8‐membered N‐tert‐butoxycarbonyl (N‐Boc)‐ and N‐para‐toluenesulfonyl (N‐Ts)‐protected cyclic amines and 9–16‐membered lactones. The synthesis of macrocyclic proline‐based lactams required slightly higher catalyst loadings. Along with monocyclic products, oligomeric
描述了一种有效的闭环复分解反应程序。在几分钟内可以达到95%的二烯丙基丙二酸二乙酯在稀溶液中的转化率,达到TOF = 4173 min -1,而载有不饱和NHC配体的商业化Ru催化剂的负载量却非常低。通常,仅需50至250 ppm的催化剂即可将近定量转化为多种5-16元杂环化合物。此过程的实用性在5-8元的合成图示ñ -叔丁氧羰基(Ñ -Boc) -和ñ -对甲苯磺酰(Ñ-Ts)保护的环胺和9-16元内酯。大环脯氨酸基内酰胺的合成需要稍高的催化剂负载量。与单环产物一起,分离并表征了寡聚副产物,主要是环二聚体。
Using stereoretention for the synthesis of <i>E</i>-macrocycles with ruthenium-based olefin metathesis catalysts
作者:Tonia S. Ahmed、T. Patrick Montgomery、Robert H. Grubbs
DOI:10.1039/c8sc00435h
日期:——
The synthesis of E-macrocycles is achieved using stereoretentive, Ru-based olefinmetathesis catalysts supported by dithiolate ligands. Kinetic studies elucidate marked differences in activity among the catalysts tested, with catalyst 4 providing meaningful yields of products in much shorter reaction times than stereoretentive catalysts 2 and 3. Macrocycles were generated with excellent selectivity
[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.
Synthesis of Unsaturated Macrocycles by Ru-Catalyzed Ring-Closing Metathesis: A Comparative Study
作者:Fabia Grisi、Chiara Costabile、Anna Grimaldi、Colomba Viscardi、Carmela Saturnino、Pasquale Longo
DOI:10.1002/ejoc.201200960
日期:2012.10
activity and stereoselectivity of phosphane- and N-heterocyclic carbene (NHC)-containing ruthenium benzylidene complexes have been evaluated in macrocyclic ring-closing olefin metathesis to produce unsaturated lactones and lactams. The success of the macrocyclization depends on the nature of the ligand (phosphane or N-heterocyclic carbene) on the ruthenium center and on the NHC properties. As for stereoselectivity
The present invention relates to a method for producing metathesis products comprising contacting metathesis starting materials under metathesis conditions with a metathesis catalyst, wherein the metathesis catalyst is employed in an amount of from 0.0001 mol-% to 1 mol-% based on half of the sum of the reactive double bonds of the metathesis starting materials and wherein the ethylene or propylene generated in the course of the reaction is removed from the reaction mixture.