Coupling of Reformatsky Reagents with Aryl Chlorides Enabled by Ylide‐Functionalized Phosphine Ligands
作者:Zhiyong Hu、Xiao‐Jing Wei、Jens Handelmann、Ann‐Katrin Seitz、Ilja Rodstein、Viktoria H. Gessner、Lukas J. Gooßen
DOI:10.1002/anie.202016048
日期:2021.3.15
organozinc reagents with aryl electrophiles using a cyclohexyl‐YPhos ligand bearing an ortho‐tolyl‐substituent in the backbone. This highly electron‐rich, bulky ligand enables the use of arylchlorides in room temperature couplings of Reformatsky reagents. The reaction scope covers diversely functionalized arylacetic and arylpropionic acid derivatives. Aryl bromides and chlorides can be converted selectively
Metal catalysis in organic reactions. 17. A nickel-promoted route to substituted allenes by reaction of 1-bromo-1,2-dienes with alkyl metals.
作者:Anna Maria Caporusso、Federico Da Settimo、Luciano Lardicci
DOI:10.1016/s0040-4039(01)80863-7
日期:1985.1
Nickel complexes are found to be catalytically active in the cross-coupling reactions of allenic bromides with alkyl metals to give substitutedallenes in excellent yields. The catalytic process proceeds generally with inversion of configuration in the allenyl moiety.
Enantioselective synthesis of α- and β-hydroxy acids using -2-phenylcyclohexan-1-ol-as chiral auxiliary
作者:D. Basavaiah、T.K. Bharathi
DOI:10.1016/s0040-4039(00)92724-2
日期:1991.7
-2-Phenylcyclohexanol has been used as a chiral auxiliary for the preparation of α- and β-hydroxyacids in 85–100% and 11–89% enantiomeric purities respectively.
New cyclohexyl-based chiral auxiliaries: Enantioselective synthesis of α-hydroxy acids
作者:Deevi Basavaiah、Peddinti Rama Krishna
DOI:10.1016/0040-4020(95)00771-y
日期:1995.10
2R)-2-(4-tert-Butylphenoxy)cyclohexan-1-ol (5) and (1R,2R)-2-(4-phenylphenoxy)cyclohexan-1-ol (6) have been used for the first time as chiralauxiliaries. Addition of alkylzinc chlorides to the corresponding glyoxylates 5a, 6a, after hydrolysis, provided (R)-α-hydroxy acids in high optical purities.