Photoinduced decarboxylative borylation of carboxylic acids
作者:Alexander Fawcett、Johan Pradeilles、Yahui Wang、Tatsuya Mutsuga、Eddie L. Myers、Varinder K. Aggarwal
DOI:10.1126/science.aan3679
日期:2017.7.21
283 Light facilitates the replacement of carboxylic acids with boron esters in the absence of metal catalysts. The conversion of widely available carboxylic acids into versatile boronic esters would be highly enabling for synthesis. We found that this transformation can be effected by illuminating the N-hydroxyphthalimide ester derivative of the carboxylic acid under visible light at room temperature
Alkylboronic Esters from Copper-Catalyzed Borylation of Primary and Secondary Alkyl Halides and Pseudohalides
作者:Chu-Ting Yang、Zhen-Qi Zhang、Hazmi Tajuddin、Chen-Cheng Wu、Jun Liang、Jing-Hui Liu、Yao Fu、Maria Czyzewska、Patrick G. Steel、Todd B. Marder、Lei Liu
DOI:10.1002/anie.201106299
日期:2012.1.9
unprecedented copper‐catalyzed cross‐coupling reaction of the title compounds with diboron reagents is described (see scheme; Ts=4‐toluenesulfonyl). This reaction can be used to prepare both primary and secondaryalkylboronic esters having diverse structures and functional groups. The resulting products would be difficult to access by other means.
Cobalt-Catalyzed Regioselective Hydroboration of Terminal Alkenes
作者:Guoqi Zhang、Jing Wu、Man Wang、Haisu Zeng、Jessica Cheng、Michelle C. Neary、Shengping Zheng
DOI:10.1002/ejoc.201701047
日期:2017.10.17
Cobalt(II) catalysts based on flexible PNP or NNN ligands were explored for the regioselective hydroboration of alkenes. A known CoII–PNP pincercomplex was found to efficiently catalyze alkene hydroboration with excellent anti-Markovnikov selectivity, whereas a newly synthesized dinuclear CoII–NNN complex was found to catalyze the hydroboration of a range of aromatic terminal alkenes with good Markovnikov
Synthesis of Secondary and Tertiary Alkyl Boronic Esters by <i>gem</i>
-Carboborylation: Carbonyl Compounds as Bis(electrophile) Equivalents
作者:Dunfa Shi、Lu Wang、Chungu Xia、Chao Liu
DOI:10.1002/anie.201804684
日期:2018.8.6
tertiary alkyl boronic esters. The addition of B2pin2 to a carbonyl compound generates α‐oxyl‐substituted alkyl boron species. Organolithium and Grignard reagents are then applied as C nucleophiles for the 1,2‐metalate rearrangement process. The organolithium reagents can also be generated by C−H lithiation or halogen/lithium exchange. The use of chiral ligands led to the generation of chiral alkyl boronic
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.