SELECTIVE HYDROGENATION OF ALDEHYDE WITH RU/BIDENTATE LIGANDS COMPLEXES
申请人:FIRMENICH SA
公开号:US20140243526A1
公开(公告)日:2014-08-28
The present invention relates to processes for the reduction by hydrogenation, using molecular H
2
, of a C
5
-C
20
substrate containing one or two aldehydes functional groups into the corresponding alcohol or diol, characterized in that said process is carried out in the presence of —at least one catalyst or pre-catalyst in the form of a ruthenium complex having a coordination sphere of the N
2
P
2
O
2
, wherein the coordinating atoms N
2
are provided by a first bidentate ligand, the coordinating atoms P
2
are provided by a second bidentate ligand and the coordinating atoms O
2
are provided by two non-linear carboxylate ligands; and —optionally of an acidic additive.
Organocatalytic Enantioselective Cycloaddition Reactions of Dienamines with Quinones
作者:Tore Kiilerich Johansen、Clarisa Villegas Gómez、Jesper R. Bak、Rebecca L. Davis、Karl Anker Jørgensen
DOI:10.1002/chem.201303526
日期:2013.12.2
Matching catalyst and substrate: Organocatalyticcycloaddition between dienamines and 1,4‐benzo‐ or 1,4‐naphthoquinones affords biologically interesting dihydronaphtho‐ and dihydroanthraquinone core structures. The enantioselectivity of this new reaction is ensured by a steric shielding catalyst and carefully selecting substrates that greatly favor the endo approach (see scheme) due to electrostatic
Asymmetricα,γ-regioselective [3 + 3] formal cycloadditions of α,β-unsaturatedaldehydes and 2-nitroallylic acetates have been developed for the first time. These reactions proceeded through a domino Michael addition–Michael addition sequence via an unusual cascade dienamine–dienamine catalysis of a chiral secondary amine, and multifunctional cyclohexene derivatives were generally constructed in moderate
首次开发了α,β-不饱和醛与2-硝基烯丙基乙酸酯的不对称α,γ-区域选择性[3 + 3]形式环加成。这些反应通过手性仲胺的不同寻常的级联二烯胺-二烯胺催化,通过多米诺骨牌迈克尔加成-迈克尔加成序列进行,在简单地用K 2 CO 3处理后,通常以中等收率构建具有优良立体选择性的多功能环己烯衍生物。
How Cysteine Reacts with Citral: An Unexpected Reaction of β,β-Disubstituted Acroleins with Cysteine Leading to Hexahydro-1,4-thiazepines
citral (3)] with cysteine gave 1:2 adducts of a novel structuraltype, namely hexahydro-1,4-thiazepines. To the best of our knowledge, the spontaneous formation of a seven-membered heterocycle from the addition of cysteine to alpha,beta-unsaturated aldehydes is unprecedented. The adduct 6 obtained from citral, under acidic conditions, reacted further to give the newbicyclic compound 8.
Selective hydrogenation of aldehyde with ru/bidentate ligands complexes
申请人:FIRMENICH SA
公开号:US09090534B2
公开(公告)日:2015-07-28
The present invention relates to processes for the reduction by hydrogenation, using molecular H2, of a C5-C20 substrate containing one or two aldehydes functional groups into the corresponding alcohol or diol, characterized in that said process is carried out in the presence of —at least one catalyst or pre-catalyst in the form of a ruthenium complex having a coordination sphere of the N2P2O2, wherein the coordinating atoms N2 are provided by a first bidentate ligand, the coordinating atoms P2 are provided by a second bidentate ligand and the coordinating atoms O2 are provided by two non-linear carboxylate ligands; and—optionally of an acidic additive.