Ligand-Controlled Chemoselective C(acyl)–O Bond vs C(aryl)–C Bond Activation of Aromatic Esters in Nickel Catalyzed C(sp<sup>2</sup>)–C(sp<sup>3</sup>) Cross-Couplings
converted into the alkylated arenes and ketone products, respectively. The utility of this newly developed protocol was demonstrated by its wide substrate scope, broad functional group tolerance and application in the synthesis of keyintermediates for the synthesis of bioactive compounds. DFT studies on the oxidative addition step helped rationalizing this intriguing reaction chemoselectivity: whereas
Catalytic Deoxygenative Coupling of Aromatic Esters with Organophosphorus Compounds
作者:Miki B. Kurosawa、Ryota Isshiki、Kei Muto、Junichiro Yamaguchi
DOI:10.1021/jacs.0c02839
日期:2020.4.22
We have developed a deoxygenative coupling of aromatic esters with diarylphosphine oxides/dialkyl phosphonates under palladium ca-talysis. In this reaction, aromatic esters can work as novel benzylation reagents to give the corresponding benzylic phosphorus compounds. The key of this reaction is the use of phenyl esters, an electron-rich diphosphine as a ligand, and sodium formate as a hydrogen source
我们开发了在钯催化下芳族酯与二芳基膦氧化物/二烷基膦酸酯的脱氧偶联。在该反应中,芳族酯可作为新型苄基化试剂生成相应的苄基磷化合物。该反应的关键是使用苯酯、富电子二膦作为配体,以及甲酸钠作为氢源。芳基羧酸也适用于该反应,使用 (Boc)2O 作为添加剂。钯/dcype 用于激活酯的酰基 CO 键并支持甲酸钠的还原。
Decarbonylative Synthesis of Aryl Nitriles from Aromatic Esters and Organocyanides by a Nickel Catalyst
作者:Junichiro Yamaguchi、Keiichiro Iizumi、Miki B. Kurosawa、Ryota Isshiki、Kei Muto
DOI:10.1055/s-0040-1705943
日期:2021.9
A decarbonylative cyanation of aromaticesters with aminoacetonitriles in the presence of a nickel catalyst was developed. The key to this reaction was the use of a thiophene-based diphosphine ligand, dcypt, permitting the synthesis of aryl nitrile without the generation of stoichiometric metal- or halogen-containing chemical wastes. A wide range of aromaticesters, including hetarenes and pharmaceutical
An efficient nickel‐catalyzeddecarbonylative amination reaction of aryl and heteroaryl esters has been achieved for the first time. The new amination protocol allows the direct interconversion of esters and amides into the corresponding amines and represents a good alternative to classical rearrangements as well as cross coupling reactions.
Decarbonylative Silylation of Esters by Combined Nickel and Copper Catalysis for the Synthesis of Arylsilanes and Heteroarylsilanes
作者:Lin Guo、Adisak Chatupheeraphat、Magnus Rueping
DOI:10.1002/anie.201604696
日期:2016.9.19
An efficient nickel/copper‐catalyzed decarbonylativesilylation reaction of carboxylic acid esters with silylboranes is described. This reaction provides access to structurally diverse silanes with high efficiency and excellent functional‐group tolerance starting from readily available esters.