Aromatization of dihydronaphthalenes have been accomplished under mild conditions using an organic photocatalyst. Scope and limitations of the approach have been evaluated along with the reaction mechanism.
Ligand-Controlled Regiodivergent Hydroformylation of Ynamides: A Stereospecific and Regioselective Access to 2- and 3-Aminoacroleins
作者:Patrick Wagner、Morgan Donnard、Nicolas Girard
DOI:10.1021/acs.orglett.9b03566
日期:2019.11.1
The rhodium-catalyzed hydroformylation of ynamides is described and gives selective access to 2- or 3-aminoacrolein derivatives. The regioselectivity of this carbonylation can be completely controlled at will thanks to the nature of the ligand used. This represents the first example of regiodivergent alkyne hydroformylation. The influence of the substituents on the different positions of the ynamide
Zeo-Click Synthesis: Copper-Zeolite-Catalyzed Synthesis of Ynamides
作者:Hassina Harkat、Sophie Borghèse、Matteo De Nigris、Serguei Kiselev、Valérie Bénéteau、Patrick Pale
DOI:10.1002/adsc.201400189
日期:2014.12.15
AbstractCopper(I)‐zeolites, especially copper(I)‐ultra stable Y zeolite (USY), are very efficient heterogeneous catalysts for the coupling of functionalized 1‐bromoalkynes and various nitrogen derivatives. Under these conditions, sulfonylated alkyl‐ or arylamines and various N‐heterocycles, such as oxazolidinones or indoles, could be efficiently transformed into the corresponding N‐alkynyl derivatives. However, imidazoles gave addition products rather than coupling products. The reaction conditions proved compatible with a variety of functional and protecting groups. Such zeolitic catalysts can be recycled and reused at least five times without significant deactivation. Low catalyst loading could be used (4 mol%) and as low as 0.8 mol% of this heterogeneous copper catalyst still gave good conversion and yields.magnified image