Formation of Quaternary Stereogenic Centers by Copper-Catalyzed Asymmetric Conjugate Addition Reactions of Alkenylaluminums to Trisubstituted Enones
作者:Daniel Müller、Alexandre Alexakis
DOI:10.1002/chem.201302856
日期:2013.11.4
undergo asymmetric copper‐catalyzedconjugateaddition (ACA) to β‐substituted enones allowing the formation of stereogenic all‐carbon quaternary centers. Phosphinamine–copper complexes proved to be particularly active and selective compared with phosphoramidite ligands. After extensive optimization, high enantioselectivities (up to 96 % ee) were obtained for the addition of alkenylalanes to β‐substituted
Tellurium-promoted stereoselective hydrodebromination of 1,1-dibromoalkenes: synthesis of (E)-bromoalkenes
作者:Gelson Perin、Angelita M. Barcellos、Thiago J. Peglow、Patrick C. Nobre、Roberta Cargnelutti、Eder J. Lenardão、Francesca Marini、Claudio Santi
DOI:10.1039/c6ra24295b
日期:——
We describe herein an efficient and simple method to the stereoselective hydrodebromination of 1,1-dibromoalkenes by using a catalytic amount of the nucleophilic species of tellurium, generated in situ by the...
Manganese-Catalyzed Cross-Coupling Reaction between Aryl Grignard Reagents and Alkenyl Halides
作者:Gérard Cahiez、Olivier Gager、Fabien Lecomte
DOI:10.1021/ol802273e
日期:2008.11.20
Aryl Grignard reagents react stereospecifically with alkenylhalides in the presence of manganese chloride (10%) to afford good yields of cross-coupling products.
Benzocycloheptynedicobalt Complexes by Intramolecular Nicholas Reactions
作者:James R. Green、Yu Ding
DOI:10.1055/s-2004-837215
日期:——
Lewis acid mediated intramolecular Nicholas reactions of aryl (Z)-enyne propargyl acetate-Co2(CO)6 complexes 1 afford benzocycloheptenyne-Co2(CO)6 complexes 2 and their heterocyclic analogues.
The ‘Hirao reduction’ revisited: a procedure for the synthesis of terminal vinyl bromides by the reduction of 1,1-dibromoalkenes
作者:Sahar Abbas、Christopher J Hayes、Stephen Worden
DOI:10.1016/s0040-4039(00)00353-1
日期:2000.4
A convenient procedure for the synthesis of vinyl bromides is described, which involves the selective reduction of the corresponding 1,1-dibromoalkenes with dimethylphosphite and triethylamine. The 1,1-dibromoalkenes are obtained in excellent yields from the corresponding aldehydes via olefination with carbontetrabromide and triphenylphosphine.