Expeditious Synthesis of Hippuristanol and Congeners with Potent Antiproliferative Activities
作者:Wei Li、Yongjun Dang、Jun O. Liu、Biao Yu
DOI:10.1002/chem.200901732
日期:2009.10.12
Rapid access: An expeditioussynthesis of hippuristanol was developed that allowed rapid access to a number of analogues with structural alteration at its E and F rings (see scheme), facilitating the structure–activity relationship studies of the novel inhibitor of eukaryotic translation initiation.
sunlight-induced CC bond formation reactions upon the addition of alcohols/ethers/acetals to olefins proceeded efficiently using di-tert-butyl peroxide (DTBP). The reactions proceeded faster than many of the previously reported sunlight and many conventional lamp photolyses, typically in 3–4 h under irradiation with sunlight, in excellent yield using olefins bearing two electron withdrawing groups (EWGs)
A Volatile Lactone of<i>Hymenoscyphus pseudoalbidus</i>, Pathogen of European Ash Dieback, Inhibits Host Germination
作者:Christian A. Citron、Corina Junker、Barbara Schulz、Jeroen S. Dickschat
DOI:10.1002/anie.201402290
日期:2014.4.22
largely unknown secondary metabolism of the plant pathogenic fungus Hymenoscyphus pseudoalbidus was investigated by use of the CLSA method. A set of volatilelactones was identified by GC/MS. The lactones were synthesized and used in bioassays in which one of the compounds was found to be a strong germinationinhibitor for ash seeds, causing necroses in the plant tissue.
A radical C–C bond formation between olefins and alcohols proceeded efficiently by simple light irradiation at room temperature. The reaction proceeded in the presence of commercially available tBuOOtBu without using the harmful elements and/or compounds that have an unpleasant smell that are often used in conventional radical reactions. In addition, the reaction did not require photosensitizers or
Improved enantioselection for chiral dirhodium(II) carboxamide-catalysed carbon-hydrogen insertion reactions of tertiary alkyl diazoacetates
作者:Michael P. Doyle、Qi-Lin Zhou、Conrad E. Raab、Gregory H.P. Roos
DOI:10.1016/0040-4039(95)00927-5
日期:1995.7
Enantiocontrol in CH insertionreactions of 3° alkyl diazoacetates, which is highly dependent on the catalyst ligand, is greatly enhanced with the use of dirhodium(II) tetrakis[methyl 1-acetylimidazolidin-2-one-4(S)-carboxylate], Rh2(4S-MACIM)4.