Ruthenium-Catalyzed Oxidative Amidation of Alkynes to Amides
作者:Andrea Álvarez-Pérez、Miguel A. Esteruelas、Susana Izquierdo、Jesús A. Varela、Carlos Saá
DOI:10.1021/acs.orglett.9b01993
日期:2019.7.5
Complex CpRuCl(PPh3)2 catalyzes reactions of terminal alkynes with 4-picoline N-oxide and primary and secondary amines to afford the corresponding amides. The reactions occur in chlorinated solvent and aqueous medium, showing applications in peptide chemistry. Stoichiometric studies reveal that the true catalysts of the processes are the vinylidene cations [CpRu(═C═CHR)(PPh3)2]+ which are oxidized
A method for preparing hexose derivatives comprises the steps of providing a silylated hexose, treating the silylated hexose with a first carbonyl compound in the presence of a catalyst to form an ketalized hexose, treating the ketalized hexose with a second carbonyl compound followed by treating with a first reductant to form an etherized hexose, and converting the etherized hexose into a target hexose derivative, which can be 2-alcohol hexose, 3-alcohol hexose, 4-alcohol hexose, or a 6-alcohol hexose. In particular, the present invention can prepare the hexose derivatives with highly regioselective scheme to protect individual hydroxyls of monosaccharide units and install an orthogonal protecting group pattern in a one-pot manner
Synthesis and evaluation of dihydroimidazolo and dihydrooxazolo ring-fused 2-pyridones—targeting pilus biogenesis in uropathogenic bacteria
作者:Nils Pemberton、Jerome S. Pinkner、Sofie Edvinsson、Scott J. Hultgren、Fredrik Almqvist
DOI:10.1016/j.tet.2008.07.015
日期:2008.9
imidazolines were reacted with an acyl-Meldrum's acid derivative under acidic conditions. To prepare the oxygen analogs, a one-pot procedure was developed that allowed synthesis of dihydrooxazolo ring-fused 2-pyridones starting from acylated serine derivatives. After hydrolysis to their corresponding carboxylicacids and lithium carboxylates, biological evaluation revealed that the sulfur could be replaced
Design and Synthesis of Fluorescent Pilicides and Curlicides: Bioactive Tools to Study Bacterial Virulence Mechanisms
作者:Erik Chorell-、Jerome S. Pinkner、Christoffer Bengtsson、Sofie Edvinsson、Corinne K. Cusumano、Erik Rosenbaum、Lennart B. Å. Johansson、Scott J. Hultgren、Fredrik Almqvist
DOI:10.1002/chem.201103936
日期:2012.4.10
Pilicides and curlicides are compounds that block the formation of the virulence factors pili and curli, respectively. To facilitate studies of the interaction between these compounds and the pili and curli assembly systems, fluorescentpilicides and curlicides have been synthesized. This was achieved by using a strategy based on structure–activity knowledge, in which key pilicide and curlicide substituents