Chemoselective Carbophilic Addition of α-Diazoesters through Ligand-Controlled Gold Catalysis
作者:Yumeng Xi、Yijin Su、Zhaoyuan Yu、Boliang Dong、Edward J. McClain、Yu Lan、Xiaodong Shi
DOI:10.1002/anie.201404946
日期:2014.9.8
α‐aryldiazoesters was achieved through ligand‐controlled gold catalysis. Unlike a dirhodiumcatalyst (which promotes CH insertion and cyclopropanation) and a copper catalyst (which catalyzes OH and NH insertions), the gold catalyst with an electron‐deficient phosphite as the ancillary ligand exclusively gave the carbophilic addition product, thus representing a new and efficient approach to form “carbophilic
The intermoleculararomaticsubstitution of N,N-dialkylanilines and alkoxybenzenes with diazoesters is shown to proceed in the presence of catalytic amounts of both copper(II) salt and acid (Lewis or Brønsted). This method is a mild and rare metal-free C–C bond formation reaction between aromatic (sp2) and aliphatic (sp3) carbons.
An iron-catalyzed arylation of α-aryl-α-diazoesters with electron-rich benzene rings was developed, which provides an efficient method for the preparation of 1,1-diarylacetates with high yields and excellent chemo- and regio-selectivities.
Asymmetric Arylation of Diazoesters with Anisoles Enabled by Cooperative Gold and Phosphoric Acid Catalysis
作者:Guangyang Xu、Meirong Huang、Tao Zhang、Ying Shao、Shengbiao Tang、He Cao、Xinhao Zhang、Jiangtao Sun
DOI:10.1021/acs.orglett.2c00709
日期:2022.4.22
An enantioselective insertion of a carbene into the Csp2–H bond of anisole derivatives has been accomplished using an achiral gold complex and a chiral phosphoric acid as the catalytic system, providing a novel protocol for the synthesis of chiral α,α-diaryl acetates. Density functional theory calculations reveal the reactivity and the origin of the enantioselectivity of this reaction.