2 + 1] cycloaddition takes place in the rhodium-catalyzed reaction of 1,6-enynes with borylsilanes bearing an alkoxy group on the silicon atoms, which react as synthetic equivalents of silylene. The reaction proceeds efficiently in 1,2-dichloroethane at 80–110 °C in the presence of a rhodium catalyst bearing bis(diphenylphosphino)methane (DPPM) as a ligand to afford 1-silacyclopent-2-enes in good to
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
Atom-Economical Ni-Catalyzed Diborylative Cyclization of Enynes: Preparation of Unsymmetrical Diboronates
作者:Natalia Cabrera-Lobera、M. Teresa Quirós、William W. Brennessel、Michael L. Neidig、Elena Buñuel、Diego J. Cárdenas
DOI:10.1021/acs.orglett.9b02485
日期:2019.8.16
We report a Ni-catalyzed diborylative cyclization of enynes that affords carbo- and heterocycles containing both alkyl- and alkenylboronates. The reaction is fully atom-economical, shows a broad scope, and employs a powerful and inexpensive catalytic Ni-based system. The reaction mechanism seems to involve activation of the enyne by Ni(0) through oxidative cyclometalation of the enyne prior to diboron
Ti-Catalyzed Multicomponent Oxidative Carboamination of Alkynes with Alkenes and Diazenes
作者:Zachary W. Davis-Gilbert、Letitia J. Yao、Ian A. Tonks
DOI:10.1021/jacs.6b09939
日期:2016.11.9
The inter- or intramolecular oxidative carboamination of alkynes catalyzed by [py2TiCl2NPh]2 is reported. These multicomponent reactions couple alkenes, alkynes and diazenes to form either α,β-unsaturated imines or α-(iminomethyl)cyclopropanes via a TiII/TiIV redox cycle. Each of these products is formed from a common azatitanacyclohexene intermediate that undergoes either β-H elimination or α,γ-coupling
TITANIUM (IV) COMPOUNDS AND METHODS OF FORMING HETEROCYCLIC COMPOUNDS USING SAME
申请人:REGENTS OF THE UNIVERSITY OF MINNESOTA
公开号:US20160200746A1
公开(公告)日:2016-07-14
The present disclosure provides Titanium (IV) compounds and methods of making heterocyclic compounds such as pyrroles using Titanium (IV) compounds. In certain embodiments, the Titanium (IV) compound is present in catalytic amounts.