Catalyst systems consisting of supported or unsupported transition metal catalysts which have modifiers on the surface. The modifiers have sulphur-containing functionalities (G
0
). In addition, the modifiers may have a spacer (Sp) and a Bronsted-basic, Bronsted-acidic or Lewis-basic functionality (G
1
). The catalyst systems may be used for hydrogenation, reductive alkylation and reductive amination.
[EN] NOBLE METAL CATALYSTS<br/>[FR] CATALYSEURS DE MÉTAL NOBLE
申请人:EVONIK DEGUSSA GMBH
公开号:WO2008098830A1
公开(公告)日:2008-08-21
[EN] Catalyst systems consisting of supported or unsupported transition metal catalysts which have modifiers on the surface. The modifiers have sulphur-containing functionalities (G0). In addition, the modifiers may have a spacer (Sp) and a Bronsted-basic, Bronsted-acidic or Lewis-basic functionality (G1). The catalyst systems may be used for hydrogenation, reductive alkylation and reductive amination. [FR] L'invention concerne des systèmes catalyseurs formés par des catalyseurs de métal de transition supportés et non supportés qui sont dotés de modificateurs sur la surface. Les modificateurs sont dotés de fonctionnalités contenant du soufre (G0). De plus, les modificateurs peuvent contenir un bras écarteur (Sp) et une fonctionnalité base de Bronsted, acide de Bronsted ou base de Lewis (G1). Les systèmes catalyseurs peuvent servir pour l'hydrogénation, l'alkylation réductrice et l'amination réductrice.
A Biomimetic Approach to Lanthionines
作者:Carlos Aydillo、Alberto Avenoza、Jesús H. Busto、Gonzalo Jiménez-Osés、Jesús M. Peregrina、María M. Zurbano
DOI:10.1021/ol203068s
日期:2012.1.6
The asymmetric sulfa-Michael additions of appropriately protected l- and d-cysteine derivatives to new chiral dehydroamino acid derivatives have been developed as key steps in the synthesis of biologically important cysteine derivatives, such as lanthionine (Lan) and β-methyllanthionine (MeLan), which are unusual bis-α-amino acids found in the emerging lantibiotics such as nisin.