已开发出B(C 6 F 5)3催化的共轭腈的甲硅烷基化还原反应,以提供具有合成价值的β-甲硅烷基胺。该反应是化学选择性的,并且在温和的条件下进行。机理说明表明,它是通过将共轭腈快速双氢化硅烷化成烯胺中间体进行的,烯胺中间体随后被还原为β-甲硅烷基胺,从而形成一个新的C(sp 3)Si键。基于这种机理上的理解,还使用大体积的硅烷建立了制备烯胺的制备途径。
作者:Yu. V. Popov、T. K. Korchagina、V. S. Kamaletdinova
DOI:10.1134/s1070363210030163
日期:2010.3
Studying of chemical properties of nitriles containing diphenyloxide fragment in their structure opens wide prospects for obtaining new compounds possessing various chemical and pharmacological properties. They can be used as biologically active substances and ingredients of rubber mixtures of polyfunctional action. Effective synthetic approaches to imidate hydrochlorides, N-substituted imidates,
The gold color of Staphylococcus aureus is derived from the carotenoid staphyloxanthin, a virulence factor for the organism. Here, we report the synthesis and activity of a broad variety of staphyloxanthin biosynthesis inhibitors that inhibit the first committed step in its biosynthesis, condensation of two farnesyl diphosphate (FPP) molecules to dehydrosqualene, catalyzed by the enzyme dehydrosqualene synthase (CrtM). The most active compounds are phosphonoacetamides that have low nanomolar K-i values for CrtM inhibition and are active in whole bacterial cells and in mice, where they inhibit S. aureus disease progression. We also report the X-ray crystallographic structure of the most active compound, N-3-(3-phenoxyphenyl)propylphosphonoacetamide (IC50 = 8 nM, in cells), bound to CrtM. The structure exhibits a complex network of hydrogen bonds between the polar headgroup and the protein, while the 3-phenoxyphenyl side chain is located in a hydrophobic pocket previously reported to bind farnesyl thiodiphosphate (FsPP), as well as biphenyl phosphonosulfonate inhibitors. Given the good enzymatic, whole cell, and in vivo pharmacologic activities, these results should help guide the further development of novel antivirulence factor-based therapies for S. aureus infections.
Synthesis of nitriles containing 3-phenoxyphenyl fragment
作者:Yu. V. Popov、T. G. Korchagina、V. S. Kamaletdinova
DOI:10.1134/s107036321004016x
日期:2010.4
Reactions of the aldol-crotonic condensation, acylation of acetonitrile, and addition of amine to the activated double bond of acrylonitrile in the series of diphenyl oxide derivatives are studied. Effective procedures for preparing the nitriles containing diphenyl oxide fragment like 3-(3-phenoxyphenyl)-propenonitrile, 3-(3-phenoxyphenyl)-2-butenonitrile, 3-phenoxybenzoylacetonitrile, 3-(3-phenoxyphenyl)-propionitrile, and 3-phenoxybenzylamino)propionitrile are developed.