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
Palladium-Catalyzed Borylation of Primary Alkyl Bromides
作者:Amruta Joshi-Pangu、Xinghua Ma、Mohamed Diane、Sidra Iqbal、Robert J. Kribs、Richard Huang、Chao-Yuan Wang、Mark R. Biscoe
DOI:10.1021/jo301156e
日期:2012.8.3
bromides react with complete selectivity in the presence of a secondary bromide. The generality of this approach is demonstrated by its extension to the use of alkyl iodides and alkyl tosylates, as well as borylation reactions employing bis(neopentyl glycolato)diboron as the boron source.
Photoinduced Radical Borylation of Alkyl Bromides Catalyzed by 4‐Phenylpyridine
作者:Li Zhang、Zhong‐Qian Wu、Lei Jiao
DOI:10.1002/anie.201912564
日期:2020.1.27
Utilizing pyridine catalysis, we developed a visible-light-induced transition-metal-free radical borylation reaction of unactivated alkyl bromides that features a broad substrate scope and mild reaction conditions. Mechanistic studies revealed a novel nucleophilic substitution/photoinduced radical formation pathway, which could be utilized to trigger a variety of radical processes.
作者:Marek Biedrzycki、William H. Scouten、Zenobia Biedrzycka
DOI:10.1016/0022-328x(92)83330-k
日期:1992.7
A series of aliphatic and benzylic bifunctional boronate esters have been prepared as potential ligands for affinity chromatography. Alpha-Acetamido, picolino, thioureido and acetamidino boronates have the hetero atom coordinated with the boron, creating a tetrahedral structure. The H-1, C-13 and B-11 NMR for these compounds confirm the structure, as well as the hetero atom-boron coordination, and show that the bonding of the internal Lewis base with boron increases in order of coordination strength: pyridine < acetamido < thiourea < acetamidine. Bifunctional boronate esters containing these alpha-substituents and phenoxy ether or dimethylaminophenoxy ether groups, which can be coupled to a solid matrix via a diazonium bond, were prepared.