Use of Aryl Chlorides as Electrophiles in Pd-Catalyzed Alkene Difunctionalization Reactions
作者:Brandon R. Rosen、Joshua E. Ney、John P. Wolfe
DOI:10.1021/jo100344k
日期:2010.4.16
The development of conditions that allow use of inexpensive aryl chlorides as electrophiles in Pd-catalyzedalkenecarboamination and carboetherification reactions is described. A catalyst composed of Pd(OAc)2 and S-Phos minimizes N-arylation of the substrate and prevents formation of mixtures of regioisomeric products. A number of heterocycles, including pyrrolidines, isoxazolidines, tetrahydrofurans
<i>C</i><sub>2</sub>-Symmetric Zirconium Bis(Amidate) Complexes with Enhanced Reactivity in Aminoalkene Hydroamination
作者:Alexander L. Reznichenko、Kai C. Hultzsch
DOI:10.1021/om9008907
日期:2010.1.11
Binaphthalenedicarboxamide zirconium complexes exhibit significantly enhanced catalytic activity in aminoalkenehydroamination reactions with respect to substrate scope (substrates without gem-dialkyl activation; cyclization of aminoheptenes), catalyst loading (as low as 0.5 mol %) and reaction temperatures (as low as 70 °C) compared to previous group 4 metal-based hydroamination catalyst systems.
Kinetic Resolution of Aminoalkenes by Asymmetric Hydroamination: A Mechanistic Study
作者:Alexanderâ L. Reznichenko、Frank Hampel、Kaiâ C. Hultzsch
DOI:10.1002/chem.200902229
日期:2009.11.23
complex for 1‐alkylaminopentenes diminishes resolution efficiency. Nevertheless, the relative cyclization rate for the two diastereomeric substrate–catalyst complexes remains in a typical range of 7–10:1. Plausible attractive π interactions between the aryl substituent and either the metal center or the aromatic system of the bis(triarylsilyl)‐substituted binaphtholate ligand may explain increased stability
Palladium-Catalyzed Tandem N-Arylation/Carboamination Reactions for the Stereoselective Synthesis of <i>N</i>-Aryl-2-benzyl Pyrrolidines
作者:Qifei Yang、Joshua E. Ney、John P. Wolfe
DOI:10.1021/ol050647u
日期:2005.6.1
The tandem N-arylation/carboamination of gamma-amino alkenes with two different aryl bromides provides rapid entry to differentially arylated N-aryl-2-benzyl pyrrolidine derivatives in good yields with good to excellent levels of diastereoselectivity. The selective diarylation is achieved in a one-pot process by an in situ modification of the palladium catalyst via phosphine ligand exchange.
Pd-Catalyzed Intramolecular Aminoalkylation of Unactivated Alkenes: Access to Diverse <i>N</i>-Heterocycles
作者:Liu Ye、Kai-Yip Lo、Qiangshuai Gu、Dan Yang
DOI:10.1021/acs.orglett.6b03295
日期:2017.1.20
A highly efficient palladium-catalyzedintramolecular aminoalkylation of unactivatedalkenes in the absence of an external ligand and oxidant is described. New C–N and C(sp3)–C(sp3) bonds are formed simultaneously. This general transformation allows for construction of diverse N-heterocycles. Mechanistic studies show that the process may involve a four-membered Pd(alkyl)amido intermediate.