Asymmetric Hydrogenation of α,β-Unsaturated Carboxylic Acids Catalyzed by Ruthenium(II) Complexes of Spirobifluorene Diphosphine (SFDP) Ligands
作者:Xu Cheng、Jian-Hua Xie、Sheng Li、Qi-Lin Zhou
DOI:10.1002/adsc.200606065
日期:2006.7
The ruthenium diacetate complexes ligated by chiral spirobifluorene diphosphines (SFDP) were very effective catalysts for the asymmetric hydrogenation of tiglic acid derivatives and α-methylcinnamic acid derivatives with high activities and excellent enantioselectivities (up to 98 % ee). The α-aryloxybutenoic acids can also be hydrogenated by these catalysts to provide the corresponding saturated α-aryloxybutanoic
Aerobic Palladium(II)-Catalyzed 5-endo-trig Cyclization: An Entry into the Diastereoselective C-2 Alkenylation of Indoles with Tri- and Tetrasubstituted Double Bonds
作者:Sandeep R. Kandukuri、Julia A. Schiffner、Martin Oestreich
DOI:10.1002/anie.201106927
日期:2012.1.27
The endo trick: An endo ring closure onto the trigonal β carbon atom of α,β‐unsaturated acceptors that are tethered to the indole nitrogen atom followed by amide cleavage enables the diastereoselective C‐2 alkenylation of indoles with fully substituted doublebonds. The carboxy group functions as a synthetically useful temporary tether (see scheme).
The contra-thermodynamic isomerization of α- and β-substituted cinnamate derivatives catalyzed by the Cu(OAc)2/rac-BINAP complex under blue light irradiation is reported. The use of an oxazolidinone template, which favored the complexation of the copper catalyst to the substrate, allowed the E → Z isomerization of the catalytically formed chromophore under simple and robust reaction conditions in good
[EN] ALBICIDIN DERIVATIVES, THEIR USE AND SYNTHESIS<br/>[FR] DÉRIVÉS D'ALBICIDINE, LEUR UTILISATION ET LEUR SYNTHÈSE
申请人:TECH UNIVERSITÄT BERLIN
公开号:WO2014125075A1
公开(公告)日:2014-08-21
The present invention relates to a antibiotically active compounds characterized by general formula (I), wherein X1, BB, BC, BD, BE and X2 are building blocks with D1, D2, D3, D4 or D5 being linkers which comprise carbon, sulphur, nitrogen, phosphor and/or oxygen atoms and which are covalently connecting the moities BA and BB, BB and BC, BC and BD, BD and BE and BE and BF, respectively, and wherein in particular the building block BC comprises an amino acid derivative. The invention relates further to said compounds for use in a method of treatment of diseases, in particular for use in a method of treatment of bacterial infections.
Synthesis of Albicidin Derivatives: Assessing the Role of N-terminal Acylation on the Antibacterial Activity
作者:Dennis Kerwat、Stefan Grätz、Julian Kretz、Maria Seidel、Maria Kunert、John B. Weston、Roderich D. Süssmuth
DOI:10.1002/cmdc.201600231
日期:2016.9.6
antibiotic albicidin, which is synthesized by the plant pathogenic bacterium, Xanthomonas albilineans, represents the most prominent member of a new class of antibacterialgyraseinhibitors. It shows remarkable antibacterial activities against Gram-positive and Gram-negative microorganisms. Its unique structure potentially represents a new leadstructure for the development of an antibacterial drug. Here