A Dual-Catalysis/Anion-Binding Approach to the Kinetic Resolution of Allylic Amines
摘要:
A dual-catalysis approach enables the small-molecule catalyzed kinetic resolution of allylic amines by acylation. By employing 2 mol % of each 4-(pyrrolidin D)pyridine (PPY) and a readily available chiral hydrogen-bonding cocatalyst, the first nonenzymatic kinetic resolution of allylic amines was accomplished with s factors of up to 20.
A Dual-Catalysis/Anion-Binding Approach to the Kinetic Resolution of Allylic Amines
摘要:
A dual-catalysis approach enables the small-molecule catalyzed kinetic resolution of allylic amines by acylation. By employing 2 mol % of each 4-(pyrrolidin D)pyridine (PPY) and a readily available chiral hydrogen-bonding cocatalyst, the first nonenzymatic kinetic resolution of allylic amines was accomplished with s factors of up to 20.
Multicomponent Synthesis of Dihydropyrimidines and Thiazines
作者:Danielle J. Vugts、Manoe M. Koningstein、Rob F. Schmitz、Frans J. J. de Kanter、Marinus B. Groen、Romano V. A. Orru
DOI:10.1002/chem.200600168
日期:2006.9.18
been observed. Furthermore, the multicomponent reaction seems to be restricted to the use of isocyanates with strongly electron-withdrawing substituents, but an interesting additional exchange reaction under microwave conditions leads to dihydropyrimidines with less electron-withdrawing substituents at N3. In addition, a diastereoselective formation of dihydropyrimidines has been observed when using a
A novel four-component reaction for the synthesis of functionalised dihydropyrimidinesElectronic supplementary information (ESI) available: 1H and 13C NMR data for 9 and 10. See http://www.rsc.org/suppdata/cc/b3/b308243a
作者:Danielle J. Vugts、Helen Jansen、Rob F. Schmitz、Frans J. J. de Kanter、Romano V. A. Orru
DOI:10.1039/b308243a
日期:——
In a multi-component reaction (MCR) of a phosphonate, nitriles, aldehydes and isocyanates, N3-functionalised dihydropyrimidines can be synthesised efficiently via a Horner-Emmons/aza Diels-Alder pathway.
Synthesis of 1H-azadienes and application to one-pot organic transformations
作者:Yearang Kwon、Mina Jeon、Jin Yong Park、Young Ho Rhee、Jaiwook Park
DOI:10.1039/c5ra26230e
日期:——
1H-Azadienes were synthesized from allyl azides by ruthenium catalysis under mild and neutral conditions. Applications of the 1H-azadienes were demonstrated for the one-pot synthesis of nitrogen containing organic compounds.
N-Benzylamines are prepared by a process in which
(i) in a first step, a benzaldehyde is reacted with a primary amine to give the imine and
(ii) in a second step, the imine is hydrogenated with hydrogen in the presence of a catalyst containing one or more metals of groups 8 to 10 of the Periodic Table of the Elements to give the N-benzylamine,
wherein the iminization (i) is carried out in a water-miscible solvent and the resulting water of reaction is not removed, and the hydrogenation (ii) is carried out in the imine solution obtained in the iminization (i) and containing water of reaction.
Verfahren zur Herstellung von N-Benzylaminen, bei dem
(i) in einem ersten Schritt ein Benzaldehyd mit einem primären Amin zum Imin umgesetzt wird, und
(ii) in einem zweiten Schritt das Imin mit Wasserstoff in Gegenwart eines Katalysators, der ein oder mehrere Metalle der Gruppen 8 bis 10 des Periodensystems enthält, zum N-Benzylamin hydriert wird,
wobei die Iminierung (i) in einem mit Wasser mischbaren Lösungsmittel durchgeführt und das entstehende Reaktionswasser nicht entfernt wird, und die Hydrierung (ii) in der bei der Iminierung (i) erhaltenen, Reaktionswasser enthaltenden Lösung des Imins durchgeführt wird.