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.
Tris(trimethylsilyl)silylboronate Esters: Novel Bulky, Air- and Moisture-Stable Silylboronate Ester Reagents for Boryl Substitution and Silaboration Reactions
作者:Eiji Yamamoto、Ryosuke Shishido、Tomohiro Seki、Hajime Ito
DOI:10.1021/acs.organomet.7b00476
日期:2017.8.28
pinacol and hexylene glycol esters ((TMS)3Si–B(pin) and (TMS)3Si–B(hg)) were prepared in 46 and 61% yields, respectively, by the reaction of tris(trimethylsilyl)silylpotassium with the corresponding boron electrophiles. Notably, these silylboronate esters exhibited high stability to air and silica gel and were applied to the transition-metal-free boryl substitution of aryl halides, providing the desired
通过反应,分别制备了新的笨重的三(三甲基甲硅烷基)甲硅烷基硼酸酯频哪醇和己二醇酯((TMS)3 Si–B(pin)和(TMS)3 Si–B(hg))。三(三甲基甲硅烷基)甲硅烷基钾与相应的硼亲电子试剂。值得注意的是,这些甲硅烷基硼酸酯在空气和硅胶中表现出很高的稳定性,可用于芳烃卤化物的无过渡金属硼取代,从而以高收率提供所需的硼化产物,并具有出色的B:Si比(高达96%的收率, B / Si = 99/1)。这些新的甲硅烷基硼酸酯还用于与各种芳基卤化物进行的顺序硼酸化/交叉偶联过程,以及用于苯乙烯的碱介导的硅烷化反应。
Palladium-Catalyzed <i>ipso</i>-Borylation of Aryl Halides Promoted by Lewis Acid-Mediated Electrophilic Activation of Aryl(halo)palladium(II) Complex
organoborons. This reaction involves base-mediated nucleophilic activation of diboron that enables transmetalation of an aryl(halo)palladium(II) intermediate with a diboron. As an alternative, herein, we have established Lewis acid-mediated conditions for borylating (pseudo)haloarenes that require no external base. The electrophilic activation of the aryl(halo)palladium(II) intermediate via dehalogenation