HYDROGENATION OF DIENALS WITH RHODIUM COMPLEXES UNDER CARBON MONOXIDE FREE ATMOSPHERE
申请人:SAUDAN Michel Alfred Joseph
公开号:US20130331611A1
公开(公告)日:2013-12-12
The present invention relates to the field of catalytic hydrogenation and, more particularly, to a process for the reduction by hydrogenation, using molecular H
2
, of a C
6
-C
20
conjugated dienal into the corresponding deconjugated enal, characterized in that said process is carried out in the presence of a catalytic system comprising at least a base and at least one complex in the form of a rhodium complex comprising a C
34
-C
60
bidentate diphosphine ligand (L2) coordinating the rhodium.
[EN] HYDROGENATION OF DIENALS WITH RHODIUM COMPLEXES UNDER CARBON MONOXIDE FREE ATMOSPHERE<br/>[FR] HYDROGÉNATION DE DIÉNALS AU MOYEN DE COMPLEXES DE RHODIUM SOUS UNE ATMOSPHÈRE EXEMPTE DE MONOXYDE DE CARBONE
申请人:FIRMENICH & CIE
公开号:WO2012150053A1
公开(公告)日:2012-11-08
The present invention relates to the field of catalytic hydrogenation and, more particularly, to a process for the reduction by hydrogenation, using molecular H2, of a C6-C20 conjugated dienal into the corresponding deconjugated enal, characterized in that said process is carried out in the presence of a catalytic system comprising at least a base and at least one complex in the form of a rhodium complex comprising a C34-C60 bidentate diphosphine ligand (L2) coordinating the rhodium.
Synthesis of γ,γ-Disubstituted Butenolides through a Doubly Vinylogous Organocatalytic Cycloaddition
作者:Anna Skrzyńska、Piotr Drelich、Sebastian Frankowski、Łukasz Albrecht
DOI:10.1002/chem.201804650
日期:2018.11.7
organocatalytic approach to γ,γ‐disubstituted butenolides is described. It is based on a fully site‐selective functionalization of 5‐alkylidenefuran‐2(5H)‐ones via trienamine‐mediated [4+2]‐cycloaddition with α,β,γ,δ‐diunsaturated aldehydes. The developed methodology proceeds with excellent stereocontrol and constitutes a unique example of trienamine chemistry with vinylogous dienophiles. Importantly,
Organocatalysis opens up for a novel cascadereaction concept where 3-oxidopyridinium betaines first undergo an enantioselective [6+4] cycloaddition with trienamines, followed by a spontaneously series of reactions to provide chiral hexahydraoazulenes, of which some show bioactivity.