نتایج جستجو برای: unsaturated β
تعداد نتایج: 192068 فیلتر نتایج به سال:
The selective hydrogenation of α,β-unsaturated aldehydes is an ideal case for studying the structure-activity relationships in heterogeneous catalysis. In particular, cinnamaldehyde can be used as probe molecule revealing competition between C=C and C=O bond. Here, we investigated effect modification some Pt supported on carbon catalysts by WOx species hydrogenation, are reported to increase ad...
A novel phosphine-catalyzed highly diastereoselective [3+2] cycloaddition of isatin derived α,β-unsaturated ketones with α-allenic ester has been developed.
pegylation is a well-established technique utilized to overcome the problems related to the therapeutic applications of peptides and proteins. reasons for the pegylation of these biological macromolecules include reducing immunogenicity, proteolytic degradation and rapid clearance from blood circulation. octreotide is an octapeptide analogue of naturally-occurred somatostatin. this peptide has ...
A novel synthesis of α,β-unsaturated amides from N,N-disulfonyl ynamides with aldehydes was developed. By utilization of salicylaldehydes, a variety of substituted iminocoumarins were prepared.
The present invention provides a process for the synthesis of an α,β-unsaturated ester from a mono-olefinester using Fe(CO).sub.5.
Homoenolates generated from α,β-unsaturated aldehydes using NHC catalysis underwent facile addition to dibenzylidene cyclohexanone to afford bicyclic cyclopentenes as single diastereomers.
Palladium-catalyzed formal arylacylation of allenes using acid chlorides and arylboronic acids has been achieved. The reaction afforded the corresponding α,β-unsaturated ketones regio- and stereoselectively.
Oxidation of α,β-unsaturated methyl ketones with selenium dioxide leads to a cascade of reactions culminating in the formation of isotetronic acids.
The synthesis of 3,4-dihydro-1,2-oxazepin-5(2H)-ones and 2,3-dihydropyridin-4(1H)-ones from β-substituted β-hydroxyaminoaldehydes is reported. The β-hydroxyaminoaldehydes were prepared by enantioselective organocatalytic 1,4-addition of N-tert-butyl (tert-butyldimethylsilyl)oxycarbamate to α,β-unsaturated aldehydes (MacMillan protocol). Alkyne addition to the aldehydes followed by alcohol oxida...
Michael addition of pyrimidine and purine nucleobases to substituted as well as unsubstituted α,β-unsaturated esters efficiently proceeds in the presence of catalytic amount of zinc oxide in ionic liquid 1-butyl-3-methylimidazolium bromide (ZnO/[bmim]Br) under microwave irradiation to afford carboacyclic nucleosides, as biologically important compounds, in good to excellent yields and in short ...
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