Selective Cleavage of Dimethylhydrazones to the Carbonyl Compounds Using Silica Gel and its Application in the Synthesis of (<i>Z</i>)-9-Tetradecenyl Acetate
作者:R. B. Mitra、G. Bhaskar Reddy
DOI:10.1055/s-1989-27363
日期:——
A new method for the selective hydrolytic cleavage of dimethylhy- drazones consists of treatment of the hydrazones with silica gel (pH 6.80) in wet tetrahydrofuran. Utilizing this method as one of the key steps, (Z)-9-tetradecenyl acetate, the pheromone of Spodoptera frugiperda, was synthesized.
作者:James B. Summers、Hormoz Mazdiyasni、James H. Holms、James D. Ratajczyk、Richard D. Dyer、George W. Carter
DOI:10.1021/jm00386a022
日期:1987.3
selection of more potent hydroxamic acidinhibitors, a simple hypothesis about the nature of enzyme-inhibitor binding was devised. In this hypothesis, the structures of compounds were matched to a proposed geometry of arachidonic acid when bound to the enzyme. Compounds that match best without extending into disfavored regions were predicted to be the best inhibitors. Three series of hydroxamates selected
[EN] TRIALKYL CATIONIC LIPIDS AND METHODS OF USE THEREOF<br/>[FR] LIPIDES CATIONIQUES TRIALKYLÉS ET LEURS PROCÉDÉS D'UTILISATION
申请人:PROTIVA BIOTHERAPEUTICS INC
公开号:WO2013126803A1
公开(公告)日:2013-08-29
The present invention provides compositions and methods for the delivery of therapeutic agents to cells. In particular, these include novel, trialkyl, cationic lipids and nucleic acid-lipid particles that provide efficient encapsulation of nucleic acids and efficient delivery of the encapsulated nucleic acid to cells in vivo. The compositions of the present invention are highly potent, thereby allowing effective knock-down of a specific target protein at relatively low doses.
Synthesis of Isotopically Labeled Arachidonic Acids To Probe the Reaction Mechanism of Prostaglandin H Synthase
作者:Sheng Peng、Nicole M. Okeley、Ah-Lim Tsai、Gang Wu、Richard J. Kulmacz、Wilfred A. van der Donk
DOI:10.1021/ja026880u
日期:2002.9.1
and 13(S)-deuterium-labeled arachidonic acids were synthesized in high enantiomeric purity as deduced from soybean lipoxygenase assays and mass spectrometric analysis of the resulting enzymatic products. Each synthetic compound was reacted under anaerobic conditions with the wide singlet tyrosyl radical of PGHS-2 to generate a radical intermediate that was analyzed by EPR. Deuterium substitution at positions
Starting from D-mannitol, the total syntheses of methyl 9(S)- and 9(R)-hydroxy 5(Z), 7(E), 11(Z) eicosatetraenoate are described by two different ways. One route uses a diepoxide opening by an acetylide while the second one involved the transformation of a diepoxide into an equivalent of malic aldehyde, an important intermediate in the synthesis of other oxidation products of arachidonic acid. Both methods