Suzuki–Miyaura Cross-Coupling of Potassium Alkoxyethyltrifluoroborates: Access to Aryl/Heteroarylethyloxy Motifs
摘要:
The introduction of an alkoxyethyl moiety onto aromatic substructures has remained a long-standing challenge for synthetic organic chemists. The main reasons are the inherent instability of alkoxyethylmetallic species and the lack of general procedures to access them. A new method utilizing a cross-coupling strategy based on the exceptional properties of organotrifluoroborates has been developed, and the method allows an easy and efficient installation of this unit on a broad range of aryl and heteroaryl bromides.
A copper(II)-catalyzed borylation of alkyl halides with bis(pinacolato)diboron (B2pin2) has been developed, which can be carried out in air, providing a wide range of primary, secondary, and some tertiary alkylboronates in high yields. A variety of functional groups are tolerated and the protocol is also applicable to unactivated alkyl chlorides (including 1,1- and 1,2-dichlorides). Preliminary mechanistic
Decarboxylative Borylation of Stabilized and Activated Carbon Radicals
作者:Qiang Zhang、Xiaojuan Li、Weigang Zhang、Shengyang Ni、Yi Wang、Yi Pan
DOI:10.1002/anie.202008138
日期:2020.12
aliphatic and aromatic boronic esters by mild photoinduced decarboxylativeborylation. Both aryl and alkyl radicals could be generated from the leaving group‐assisted N‐hydroxybenzimidoyl chloride esters, even α‐CF3 substituted substrates could be activated for further elaboration.
Electrochemical Borylation of Alkyl Halides: Fast, Scalable Access to Alkyl Boronic Esters
作者:Bingbing Wang、Pan Peng、Wan Ma、Zhao Liu、Cheng Huang、Yangmin Cao、Ping Hu、Xiaotian Qi、Qingquan Lu
DOI:10.1021/jacs.1c06473
日期:2021.8.25
Herein, a fast, scalable, and transition-metal-free borylation of alkyl halides (X = I, Br, Cl) enabled by electroreduction is reported. This process provides an efficient and practical access to primary, secondary, and tertiary boronic esters at a high current. More than 70 examples, including the late-stage borylation of natural products and drug derivatives, are furnished at room temperature, thereby
Copper nanoparticle-catalyzed borylation of alkyl bromides with an organodiboron compound
作者:Ju Hyun Kim、Young Keun Chung
DOI:10.1039/c4ra05999a
日期:——
Borylation of primary and secondary alkyl bromides with bis(pinacolato)diboron was carried out in the presence of commercially available copper nanoparticles as catalysts.
cobalt-complex-catalyzed borylation of a wide range of alkyl halides with a diboron reagent (B2pin2 or B2neop2) has been developed under mild reaction conditions, demonstrating the first cobalt-mediated cross-coupling with alkyl electrophiles. This protocol allows alkyl boronic esters to be accessed from alkyl halides, including alkylchlorides, which were used rarely as coupling partners. Mechanistic