Retention or Inversion in Stereospecific Nickel-Catalyzed Cross-Coupling of Benzylic Carbamates with Arylboronic Esters: Control of Absolute Stereochemistry with an Achiral Catalyst
作者:Michael R. Harris、Luke E. Hanna、Margaret A. Greene、Curtis E. Moore、Elizabeth R. Jarvo
DOI:10.1021/ja311783k
日期:2013.3.6
pivalates with aryl- and heteroarylboronic esters has been developed. The reaction proceeds with selective inversion or retention at the electrophiliccarbon, depending on the nature of the ligand. Tricyclohexylphosphine ligand provides the product with retention, while an N-heterocyclic carbene ligand provides the product with inversion.
Palladium-Catalyzed Asymmetric Benzylic Alkylation of Active Methylene Compounds with α-Naphthylbenzyl Carbonates and Pivalates
作者:Sho Tabuchi、Koji Hirano、Masahiro Miura
DOI:10.1002/anie.201602075
日期:2016.6.6
Pd/(R)‐H8‐BINAP‐catalyzed asymmetric benzylic alkylation of active methylene compounds has been developed. The reaction proceeds without the use of an external base, and the starting racemic diarylmethyl carbonates are converted into the optically active coupling products which contain the benzylic chiral stereocenter by a dynamickineticasymmetrictransformation (DYKAT). Additionally, with suitable
Asymmetric Synthesis of Diarylmethyl Sulfones by Palladium-Catalyzed Enantioselective Benzylic Substitution: A Remarkable Effect of Water
作者:Atifah Najib、Koji Hirano、Masahiro Miura
DOI:10.1002/chem.201800744
日期:2018.5.2
A Pd/(R)‐BINAP‐catalyzed enantioselective benzylic sulfonation of diarylmethyl carbonates with sodium sulfinates proceeds to deliver the corresponding chiral diarylmethyl sulfones in good yields with high enantioselectivity. The reaction occurs in a dynamickineticasymmetrictransformation (DYKAT) manner and thus provides convergent access to optically active benzylic sulfones from racemic secondary
Palladium-Catalyzed Benzylic Phosphorylation of Diarylmethyl Carbonates
作者:Akihiro Matsude、Koji Hirano、Masahiro Miura
DOI:10.1021/acs.orglett.8b01323
日期:2018.6.15
pinacol-derived H-phosphonate proceeds to deliver the corresponding benzylic phosphorylated products in good yields. Moreover, the asymmetricsynthesis is possible via a Pd/(Rp,R′p)-(S)-Mandyphos-catalyzed kinetic resolution–DYKAT (dynamickineticasymmetrictransformation) sequence, and optically active α-chiral diarylmethylphosphonates are obtained with synthetically useful yields and enantiomeric
Palladium-Catalyzed Asymmetric Benzylic Substitution of Secondary Benzyl Carbonates with Nitrogen and Oxygen Nucleophiles
作者:Atifah Najib、Koji Hirano、Masahiro Miura
DOI:10.1021/acs.orglett.7b01022
日期:2017.5.5
A Pd/(R)-BINAP-catalyzed asymmetric benzylic substitution of secondary benzyl carbonates with amides and amines proceeds to form the corresponding optically active benzylamines in good yields with a high enantiomeric ratio. The reaction occurs in a dynamickineticasymmetrictransformation (DYKAT) manner. Additionally, the asymmetric Pd catalysis can also be applicable to phenol nucleophiles, thus