نتایج جستجو برای: cyclizations

تعداد نتایج: 570  

Journal: :International Journal of Molecular Sciences 2008
William N. Setzer

Essential oils that contain large concentrations of germacrene D are typically accompanied by cadinane sesquiterpenoids. The acid-catalyzed cyclization of germacrene D to give cadinane and selinane sesquiterpenes has been computationally investigated using both density functional (B3LYP/6-31G(*)) and post Hartree-Fock (MP2/6-31G(* *)) ab initio methods. The calculated energies are in general ag...

Journal: :Chemical communications 2015
Anika Kreienbrink Menyhárt B Sárosi Robert Kuhnert Peter Wonneberger Anna I Arkhypchuk Peter Lönnecke Sascha Ott Evamarie Hey-Hawkins

The reaction of 1,2-bis(N,N-dimethylaminochloro-phosphanyl)-1,2-dicarba-closo-dodecaborane(12) and lithiated phenylacetylene gives a five-membered dihydrophosphole derivative with an exocyclic phosphanyl group. This unexpected reaction opens new possibilities for the synthesis of carbaborane-containing phosphorus heterocycles. P,P'-alkynylated 1,2-bis(phosphanyl)-1,2-dicarba-closo-dodecaborane(...

Journal: :Organic & biomolecular chemistry 2010
Vincent Fagan Sarah Bonham Michael P Carty Fawaz Aldabbagh

Bu(3)SnH/1,1'-azobis(cyclohexanecarbonitrile) (ACN)-mediated five, six, and seven-membered double alkyl radical cyclizations onto imidazo[5,4-f]benzimidazole and imidazo[4,5-f]benzimidazole are described. The quinone derivatives evaluated show selective toxicity towards human cervical (HeLa) and prostate (DU145) cancer cell lines (with negligible toxicity towards a normal human cell line, GM006...

2017
Connor Yap Gabriel M J Lenagh-Snow Somnath Narayan Karad William Lewis Louis J Diorazio Hon Wai Lam

Enantioselective nickel-catalyzed arylative cyclizations of substrates containing a Z-allylic phosphate tethered to an alkyne are described. These reactions give multisubstituted chiral aza- and carbocycles, and are initiated by the addition of an arylboronic acid to the alkyne, followed by cyclization of the resulting alkenylnickel species onto the allylic phosphate. The reversible E/Z isomeri...

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