Ruthenium-catalyzed C–H Silylation of Methylboronic Acid Using a Removable α-Directing Modifier on the Boron Atom
作者:Hideki Ihara、Akinori Ueda、Michinori Suginome
DOI:10.1246/cl.2011.916
日期:2011.9.5
Ruthenium-catalyzed C–H silylation of methylboronic acid was achieved by use of 2-(1H-pyrazol-3-yl)aniline as a removable α-directing modifier on the boron atom. Cross-coupling of the product, i.e., (phenyldimethylsilyl)methylpinacolborane, with aryl halides proceeded in the presence of a [PdCl2(dppf)] catalyst and CsOH as a base.
Olefin hydroboration catalyzed by an iron-borane complex
作者:Laura A. Grose、Darren Willcox
DOI:10.1039/d3cc00494e
日期:——
The well-defined iron(0) complex [(iPrDPBPh)Fe2-(μ-1,2-N2)] (A) reacts with HBpin to afford the complex [(η3-H2iPrDPB)Fe(η3-H2Bpin)] (B) via oxidative addition of the H–B bond. Complex A is an effective pre-catalyst for the hydroboration of a range of olefins in synthetically useful yields (typically >80%) under neat conditions.
定义明确的铁 (0) 络合物 [( i Pr DPB Ph )Fe 2 -(μ-1,2-N 2 )] (A) 与 HBpin 反应生成络合物 [( η 3 -H 2 i Pr DPB )Fe( η 3 -H 2 Bpin)] (B)通过H–B 键的氧化加成。络合物 A 是一种有效的预催化剂,可在纯净条件下以合成有用的产率(通常 >80%)对一系列烯烃进行硼氢化。
Organocatalytic hydroboration of olefins in pyrrolidinium ionic liquids
An efficient, simple, metal and ligand free, regioselective hydroboration of alkenes has been developed using pinacolborane (HBpin) as a reducing reagent and 1-ethyl-methylpyrrolidinium triflate [EMPyrr][OTf] as a non-corrosive and recyclable organocatalyst. The described protocol is scalable and compatible with a variety of alkenes offering the desired organoboron compounds in moderate-to-excellent
Photo-Triggered, Copper(II) Chloride-Catalyzed Radical Hydroalkylation and Hydrosilylation of Vinylboronic Esters To Access Alkylboronic Esters
作者:Wei Zhou、Zhi-Wen Luo、Hua Xiao、Jun Yi、Jian-Jun Dai
DOI:10.1021/acs.joc.3c01705
日期:2023.10.20
Herein, we present a phototriggered, CuCl2-catalyzed radical hydroalkylation and hydrosilylation of vinylboronic esters to alkylboronic esters. This approach exhibits mild reaction conditions, utilization of easily accessible reagents, and scalability up to a gram scale. Further synthetic transformations of the hydrosilylation products and mechanistic studies are also demonstrated.
Enantioselective Construction of Tertiary Boronic Esters by Conjunctive Cross-Coupling
作者:Jesse A. Myhill、Liang Zhang、Gabriel J. Lovinger、James P. Morken
DOI:10.1002/anie.201807775
日期:2018.9.24
Catalytic enantioselectiveconjunctive cross‐coupling has been developed to construct tertiary alkylboronic esters. These reactions occur with good yield and enantioselectivity for a range of substrates. Mechanistic experiments reveal aspects of the catalytic cycle that allow hindered substrates to react without significant complicating side reactions.