Intermolecular Aminoallylation of Alkenes Using Allyl-Oxyphthalimide Derivatives: A Case Study in Radical Polarity Effects
作者:Samuel W. Lardy、Valerie A. Schmidt
DOI:10.1002/ejoc.201901071
日期:2019.10.31
This work describes the essential radicalpolarityeffects manifested in pursuit of a group transfer radical addition to achieve alkeneaminoallylation. Each open shell intermediate along the proposed mechanistic pathway is steered to preferentially react with only one reagent.
Traversing Steric Limitations by Cooperative Lewis Base/Palladium Catalysis: An Enantioselective Synthesis of α‐Branched Esters Using 2‐Substituted Allyl Electrophiles
作者:Kevin J. Schwarz、Colin M. Pearson、Gabriel A. Cintron‐Rosado、Peng Liu、Thomas N. Snaddon
DOI:10.1002/anie.201803277
日期:2018.6.25
Cooperative catalysis enables the direct enantioselective α‐allylation of linear prochiral esters with 2‐substituted allyl electrophiles. Critical to the successful development of the method was the recognition that metal‐centered reactivity and the source of enantiocontrol are independent. This feature is unique to simultaneous catalysis events and permits logical tuning of the supporting ligands
Synthesis of Quaternary Carbon Centers via Hydroformylation
作者:X. Sun、K. Frimpong、K. L. Tan
DOI:10.1021/ja1036226
日期:2010.9.1
application of hydroformylation to the synthesis of quaternary carbon centers is reported. The synthesis of the highly substituted carbon is achieved by applying a catalyticamount of 1. Ligand 1 serves as a catalyticdirectinggroup by covalently and reversibly binding to both the substrate and catalyst. The intramolecular nature of the directinggroup strategy accelerates the hydroformylation reaction
Direct C–H Allylation of Unactivated Alkanes by Cooperative W/Cu Photocatalysis
作者:Pol Martínez-Balart、Balázs L. Tóth、Álvaro Velasco-Rubio、Martín Fañanás-Mastral
DOI:10.1021/acs.orglett.2c02887
日期:2022.9.23
enables the direct allylation of strong aliphatic C–H bonds with simple allylic chlorides. The method relies on a cooperative interaction of two metal catalysts in which the decatungstate anion acts as a hydrogen-atom abstractor generating a nucleophilic carbon-centered radical that engages in an SH2′ reaction with an activated allylic π-olefin–copper complex. Because of this dualcatalysis, the protocol
在这里,我们报告了一种光催化方法,该方法能够用简单的烯丙基氯化物直接烯丙基化强脂肪族 C-H 键。该方法依赖于两种金属催化剂的协同作用,其中十钨酸盐阴离子作为氢原子吸收剂产生亲核碳中心自由基,该自由基与活化的烯丙基π-烯烃-铜络合物发生S H 2' 反应。由于这种双重催化作用,该协议允许在温和条件下在短反应时间内对一系列化学原料和天然产物进行功能化。