Divergent Synthesis of Isonitriles and Nitriles by Palladium-Catalyzed Benzylic Substitution with TMSCN
作者:Kento Asai、Koji Hirano、Masahiro Miura
DOI:10.1021/acs.joc.0c01861
日期:2020.10.2
Ligand-controlled palladium-catalyzed divergent synthesis of isonitriles and nitriles from benzylic carbonates and TMSCN has been developed. The BINAP- or DPEphos-ligated palladium catalyst selectively provides the corresponding benzylic isonitriles, whereas their regioisomers, benzylic nitriles, are formed exclusively under phosphine ligand-free conditions. Mechanistic studies reveal that isonitrile
Benzylation and allylation of aldehydeacylanions were enabled by the merger of a thiazolium N‐heterocyclic carbene (NHC) catalyst and a palladium/bisphosphine catalyst in a synergistic manner. Owing to the mildness of the reaction conditions, various functional groups were tolerated in the substrates.
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
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