Visible‐Light‐Enabled Carboxylation of Benzyl Alcohol Derivatives with CO
<sub>2</sub>
Using a Palladium/Iridium Dual Catalyst
作者:Yushu Jin、Naoyuki Toriumi、Nobuharu Iwasawa
DOI:10.1002/cssc.202102095
日期:2022.2.8
Double trouble: A highly efficient visible-light-enabled carboxylation of benzyl alcohol derivatives using CO2 is achieved with a Pd/Ir dual catalyst. A variety of benzyl carboxylic acids and esters can be prepared from the corresponding benzyl alcohol derivatives with high efficiency. By changing the Pd catalyst, switchable site-selective carboxylation between benzylic C−O and aryl C−Cl moieties is
双重麻烦:使用Pd/Ir 双催化剂实现了使用 CO 2对苯甲醇衍生物进行高效可见光羧化。由相应的苄醇衍生物可以高效地制备多种苄基羧酸和酯。通过改变 Pd 催化剂,可以在苄基 C-O 和芳基 C-Cl 部分之间进行可切换的位点选择性羧化。
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
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 Silylation of Diarylmethyl Carbonates with Silylboranes under Base‐Free Conditions
作者:Kento Asai、Koji Hirano、Masahiro Miura
DOI:10.1002/ejoc.202101535
日期:2022.5.6
developed. By taking advantage of in-situ generated alkoxide ligand arising from the carbonate substrate, the reaction proceeds smoothly even under external base-free conditions. The resulting benzyl silane moiety can undergo the post functionalizations to deliver the more complex diarylmethane derivatives. Additionally, the related base-free allylic silylation reaction is also demonstrated.