Preparation of Benzolactams by Pd(OAc)2-Catalyzed Direct Aromatic Carbonylation
摘要:
We developed a new method for Pd(II)-catalyzed direct aromatic carbonylation in a phosphine-free catalytic system using Pd(OAc)2 and Cu(OAc)2 in an atmosphere of CO gas containing air. The carbonylation proceeded with ortho-palladation, inducing a remarkable site selectivity to afford a variety of five- or six-membered benzolactams from secondary omega-arylalkylamines, such as N-alkylbenzylamines or N-alkylphenethylamines.
Ruthenium-Catalyzed <i>N</i>-Alkylation of Amines with Alcohols under Mild Conditions Using the Borrowing Hydrogen Methodology
作者:Arrey B. Enyong、Bahram Moasser
DOI:10.1021/jo501273t
日期:2014.8.15
Using a simple amino amide ligand, ruthenium-catalyzed one-pot alkylation of primary and secondary amines with simple alcohols was carried out under a wide range of conditions. Using the alcohol as solvent, alkylation was achieved under mild conditions, even as low as room temperature. Reactions occurred with high conversion and selectivity in many cases. Reactions can also be carried out at high temperatures
Although it is recognized that the presence of water is disadvantageous for imine synthesis, we demonstrate that such synthesis can be effective in completely aqueous media, without any catalyst and under mild conditions. Thus, aryl-aryl, aryl-alkyl, alkyl-aryl and alkyl-alkyl monoimines as well as a large variety of diimines are obtained by direct condensation of the corresponding carbonyl compounds and amines, in water. The same process is used to synthesize macrocyclic diimines starting from methylene, ethylene, trimethylene and tetramethylene glycol bis(2-formylphenyl ether) and ethylene-, trimethylene- and tetramethylene-diamine, some of these macrocycles being known for their chelating properties.
A synthetic approach to the plakoridines modeled on a biogenetic theory
作者:Laura L. Etchells、Ali Sardarian、Roger C. Whitehead
DOI:10.1016/j.tetlet.2005.02.124
日期:2005.4
An expedient synthetic route to the fully substituted pyrrolidine ring system of the plakoridines is described using an approach modeled on a plausible biosynthetic pathway.
使用模拟生物合成途径的方法描述了权宜的合成途径,用于合成吡咯烷的吡咯烷环系统。
Chemical predisposition in synthesis: application to the preparation of the pyrrolidine natural products, plakoridines A and B
作者:Laura L. Etchells、Madeleine Helliwell、Neil M. Kershaw、Ali Sardarian、Roger C. Whitehead
DOI:10.1016/j.tet.2006.08.075
日期:2006.11
The pyrrolidine natural products, plakoridines A and B, as well as an array of unnatural analogues, have been prepared using a five-step synthetic sequence modelled on a biogenetic theory. The key transformation involves a `Mannich/Michael/intemal-redox' cascade, which proceeds in yields of 31-63%. (c) 2006 Elsevier Ltd. All fights reserved.
Synthetic analogues of the manzamenones and plakoridines which inhibit DNA polymerase
作者:Jeremy R. Doncaster、Laura L. Etchells、Neil M. Kershaw、Ryoichi Nakamura、Hazel Ryan、Ryo Takeuchi、Kengo Sakaguchi、Ali Sardarian、Roger C. Whitehead
DOI:10.1016/j.bmcl.2006.03.005
日期:2006.6
An array of novel analogues of the marine oxylipins, the manzamenones and plakoridines, have been prepared in divergent fashion using an approach modelled on a biogenetic theory. Many of the target compounds show potent inhibition of DNA polymerases alpha and beta and human terminal deoxynucleotidyl transferase (TdT).