Free radical rearrangements of organocobaloximes: alkynyl to cycloalkylidene and hexenyl to cyclopentylmethyl
作者:Peter Bougeard、Christopher J. Cooksey、Michael D. Johnson、Melanie J. Lewin、Stewart Mitchell、Paul A. Owens
DOI:10.1016/0022-328x(85)80129-7
日期:1985.6
alkylcobaloximes undergo rearrangement to more stable substituted alkyl- or alkenyl-cobaloximes. When the same reactions are carried out in the presence of carbon tetrachloride or chloroform, no rearranged organocobaloximes are obtained, but a variety of organic products are obtained derived from the interception of transient organic radicals by the halogenated solvent. The rearrangements are rationalised
Catalytic Reduction of Phenyl-Conjugated Acetylenic Halides by Nickel(I) Salen: Cyclization versus Coupling
作者:Mohammad S. Mubarak、Theodore B. Jennermann、Michael A. Ischay、Dennis G. Peters
DOI:10.1002/ejoc.200700655
日期:2007.11
to study the catalyticreduction of five phenyl-conjugated haloalkynes by nickel(I) salen electrogenerated at carbon cathodes in dimethylformamide containing tetramethylammonium tetrafluoroborate. Electrocatalytic reduction of 7-bromo- and 7-iodo-1-phenyl-1-heptyne affords the carbocyclic product, benzylidenecyclohexane, in up to 41 % yield, whereas under similar conditions reduction of 5-halo-1-phenyl-1-pentyne
Scope of the Intramolecular Titanocene-Catalyzed Pauson−Khand Type Reaction<sup>1</sup>
作者:Frederick A. Hicks、Natasha M. Kablaoui、Stephen L. Buchwald
DOI:10.1021/ja990682u
日期:1999.6.1
A Pauson−Khandtype conversion of enynes to bicycliccyclopentenones employing the commercially available precatalyst titanocene dicarbonyl is described. This methodology shows excellent functional group tolerance for a group 4 metallocene-catalyzed process. The scope and limitations of this cyclization with respect to 1,6-, 1,7- and 1,8-enynes with a variety of terminal alkyne substituents, chiral
Identification of Small Molecule Agonists of the Orphan Nuclear Receptors Liver Receptor Homolog-1 and Steroidogenic Factor-1
作者:Richard J. Whitby、Sally Dixon、Patrick R. Maloney、Philippe Delerive、Bryan J. Goodwin、Derek J. Parks、Timothy M. Willson
DOI:10.1021/jm060990k
日期:2006.11.1
We report the identification of substituted cis-bicyclo[3.3.0]-oct-2-enes as small molecule agonists of subfamily V orphan nuclear receptors (NR5A), liver receptor homolog-1 (LRH-1) and steroidogenic factor-1 (SF-1). Using fluorescence resonance energy transfer (FRET)-based biochemical assays, compound 5a (GSK8470) was identified as a high-affinity ligand for LRH-1 and SF-1. In liver cells, 5a increased
Low-valent titanium and zirconium reagents in situ prepared from metallocene dichlorides (Cp2MCl2: M = Ti, Zr) and magnesium powder activated by 1,2-dibromoethane smoothly reacted with allylpropargylethers to afford 3-methylenetetrahydrofurans in good yields. It is noteworthy that the Cp2Zr- and Cp2Ti-mediated cyclizations proceed with inverse stereoselectivity.