Organomanganese (II) reagents XVI1: copper-catalyzed 1,4-addition of organomanganese chlorides to conjugated enones
作者:Gérard Cahiez、Mouad Alami
DOI:10.1016/s0040-4039(00)99434-6
日期:1989.1
Copper-catalyzed conjugate addition of organomanganese chlorides to conjugated enones in THF, at 0°C, leads to the 1,4 addition products in high yields. The scope of the reaction is very large and the results are generally better than those obtained from organomagnesium compounds in the presence of a copper salt as well as from organocopper or cuprate reagents. Furthermore organomanganese chlorides are indisputably
Mn(III)-mediated radical CC bond formation: regioselective α′-allylation of α,β-unsaturated ketones
作者:Cihangir Tanyeli、Devrim Özdemirhan
DOI:10.1016/s0040-4039(02)00726-8
日期:2002.5
Mn(OAc)3-mediated regioselective α′-allylation of α,β-unsaturated enones is described. α′-Allyl α,β-unsaturated enones are obtained through a radical process in good yields.
Mn(III)-based C–C bond formation: regioselective α′-allylation of various α,β-unsaturated, α and β-alkoxy α,β-unsaturated ketones
作者:Cihangir Tanyeli、Devrim Özdemirhan
DOI:10.1016/j.tet.2005.06.031
日期:2005.8
The Manganese(III) -based regioselective alpha'-keto radical generation of unsaturated ketones is a versatile synthetic procedure with broad applicability. The generated alpha'-keto radical slowly creates a metal enolate in a solvent at reflux. The resultant metal enolate affords the corresponding alpha'-allylated alpha,beta-unsaturated ketones in good yields. This method is the first example of the metal mediated regioselective alpha'-allylation of alpha,beta-unsaturated ketones. The ketones that have alpha or beta-alkoxy groups also work efficiently. (c) 2005 Elsevier Ltd. All rights reserved.
Nicolaou, K. C.; Stepan, Antonia F.; Lister, Troy, Journal of the American Chemical Society, 2008, vol. 130, p. 13110 - 13119
作者:Nicolaou, K. C.、Stepan, Antonia F.、Lister, Troy、Li, Ang、Montero, Ana、et al.
DOI:——
日期:——
Feasibility of an immunoassay for mevalonolactone
作者:Thomas A. Spencer、Dawn S. Clark、Gary A. Johnson、Sandra K. Erickson、Linda K. Curtiss
DOI:10.1016/s0968-0896(97)00032-1
日期:1997.5
Mevalonic acid is a key intermediate in a broad spectrum of cellular biological processes and their regulation. Availability of a rapid, sensitive and accurate method for its assay would be highly useful. Therefore, the feasibility of developing an immunoassay for mevalonic acid in biological samples was explored. The strategy employed was to synthesize several racemic haptens structurally resembling R-mevalonolactone, the cyclic form of mevalonic acid present at lower pH and presumed to be more antigenic. Two of these haptens were coupled to keyhole limpet hemocyanin, and the resulting conjugates were used successfully to generate antibodies in rabbits. The first antiserum bound to R,S-mevalonolactone much more effectively at pH 4.0 than at pH 6.0, consistent with the structural resemblance of the haptens to the lactone form. This antiserum also bound the free hapten from which it was generated and two others of different structure with comparable effectiveness, and slightly better than it bound R,S-mevalonolactone at pH 4.0. Similar results were obtained with the antiserum to the second hapten. The binding of either antiserum to the natural enantiomer, R-mevalonolactone, was 20 times weaker than to R,S-mevalonolactone, suggesting that the nonbiological enantiomer was more antigenic. Nevertheless, the results demonstrate that an immunochemical approach to accurate quantitation of mevalonic acid in biological samples is feasible. (C) 1997 Elsevier Science Ltd.