dicarbonyl-(2,4-bis(trimethylsilyl)bicyclo[3.3.0]nona-1,4-dien-3-one)[acetonitrile]iron;Knölker’s complex;acetonitrile dicarbonyl(1,3-bis(trimethylsilyl)-4,5,6,7-tetrahydro-2H-inden-2-one) iron
Chemoselective formation of cyclo-aliphatic and cyclo-olefinic 1,3-diols via pressure hydrogenation of potentially biobased platform molecules using Knölker-type catalysts
[EN] N-ALKYLATED AMINO ACIDS AND OLIGOPEPTIDES, USES THEREOF AND METHODS FOR PROVIDING THEM.<br/>[FR] ACIDES AMINÉS N-ALKYLÉS ET OLIGOPEPTIDES, LEURS UTILISATIONS ET LEURS PROCÉDÉS DE PRODUCTION
申请人:UNIV GRONINGEN
公开号:WO2018178397A1
公开(公告)日:2018-10-04
The invention relates to the synthesis of amphiphilic amino acid derivatives, in particular to a method for the N-alkylation of an unprotected amino acid or the N-terminus of an oligopeptide substrate, comprising reacting said unprotected amino acid or oligopeptide substrate with an alcohol, e.g. a fatty alcohol, in the presence of a homogeneous transition metal catalyst.
A Comparative Study of Structurally Related Homogeneous Ruthenium and Iron Catalysts for the Hydrogenation of Levulinic Acid to γ‐Valerolactone
作者:Christian A. M. R. van Slagmaat、Stefaan M. A. De Wildeman
DOI:10.1002/ejic.201700938
日期:2018.2.14
The (transfer) hydrogenation of non-esterified levulinicacid (LA) to γ-valerolactone (GVL) using isopropyl alcohol or hydrogen gas was established with the Shvo catalyst and a modified Knölker-type catalyst. This reaction was further optimized and investigated in a comparative way regarding the structurally related ruthenium and iron catalysts.
Reductive amination under hydrogen pressure is a valuable process in organic chemistry to access amine derivatives from aldehydes or ketones. Knölker’s complex has been shown to be an efficient iron catalyst in this reaction. To determine the influence of the substituents on the cyclopentadienone ancillary ligand, a series of modified Knölker’s complexes was synthesised and fully characterised. These
The photochemical exchange of all three carbonyl ligands with acetonitrile converts tricarbonyliron-dienecomplexes into the very labile triacetonitrile-iron-diene complexes. These easily demetalate in high yields to the corresponding free ligands on injection of air at -30°C [Eq. (1)]. The noveldemetalation procedure is applied to the tricarbonyliron complexes of cyclopentadienones, cyclohexa-1,3-dienes
developed to oxidise aldo-hexoses and -pentoses into sugar lactones using different acceptors. The transformation occurs on unprotected sugars with complete chemo-selectivity for the anomeric position. An application for the competitive oxidation of pentose from a mixture of C5 and C6 sugars is also reported. Finally, we managed to perform the oxidation of xylose with only an equimolar amount of a carefully