Palladium-Catalyzed β-C(sp<sup>3</sup>)–H Arylation of Aliphatic Ketones Enabled by a Transient Directing Group
作者:Yangyang Wang、Gaorong Wu、Xiaobo Xu、Binghan Pang、Shaowen Liao、Yafei Ji
DOI:10.1021/acs.joc.1c00646
日期:2021.5.21
The direct arylation of aliphatic ketones has been developed via Pd-catalyzed β-C(sp3)–H bond functionalization with 2-(aminooxy)-N,N-dimethylacetamide as a novel transient directing group (TDG), which showed remarkable directing ability to generate arylated products in moderate to good yields. Furthermore, the reaction can tolerate abundant substrate of ketones and aryl iodides. This study expands
Palladium-Catalyzed β-C–H Arylation of Aliphatic Aldehydes and Ketones Using Amino Amide as a Transient Directing Group
作者:Cong Dong、Liangfei Wu、Jianwei Yao、Kun Wei
DOI:10.1021/acs.orglett.9b00366
日期:2019.4.5
This paper describes a new amino-amide-based transient directing group (TDG). The TDG can exhibit better performance in the Pd-catalyzed arylation of aliphatic aldehydes and ketones. This reaction showed good substrate compatibility and regioselectivity. The results indicated that 3-amino-N-isopropylpropionamide was more beneficial to the β-arylation of aliphatic aldehydes than other TDGs under relatively
Palladium-Catalyzed<i>β</i>-C−H Arylation of Ketones Using Amino Amide as a Transient Directing Group: Applications to Synthesis of Phenanthridinone Alkaloids
The direct arylation of aromatic and aliphatic ketones was carried out via palladium‐catalyzed inert C−H bond functionalization with 2‐amino‐N‐isopropyl‐acetamide as a new catalytic transient directing group. The reaction showed excellent functional group compatibility and site selectivity. We demonstrated that α‐amino amide forming N,N‐bidentate coordination with Pd catalyst is more favorable for
can act as temporary directing groups in the Pd-catalyzed coupling of arenes with aldehydes or ketones. By reversibly binding to these latter substrates just long enough for the Pd catalysis to ensue, the amino acids eliminate the need for more laborious directing group manipulations. Science, this issue p. 252 Amino acids can reversibly complex with aldehydes and ketones to direct palladium-catalyzed
Ligand-Promoted Palladium-Catalyzed β-C(sp3)–H Arylation of Ketones Using Acetohydrazide as a Transient Directing Group
作者:Kai Jia、Junjie Wang、Chao Jiang、Xuan Wang
DOI:10.1055/a-2310-0880
日期:——
A palladium-catalyzed β-C(sp3)–H arylation of aliphatic ketones by using acetohydrazide as a transient directing group has been developed. The reaction proceeds through a less-favored [5,5]-bicyclic palladacycle intermediate and is promoted by a pyridine ligand.