methylenation of acyl fluorides and acyl chlorides with substituted with aryl, alkenyl, and alkyl groups trimethylaluminum afforded an array of 2-substituted propene derivatives. The addition of a catalytic amount of DPPM increased an efficiency of the reactions. Trimethylaluminum as the methylenation reagent not only eliminates the presynthesis of methylene transfer reagent, but provides an efficient method for
Ni-Catalyzed Reductive Allylation of α-Chloroboronates to Access Homoallylic Boronates
作者:Yixian Lou、Jian Qiu、Kai Yang、Feng Zhang、Chenglan Wang、Qiuling Song
DOI:10.1021/acs.orglett.1c01213
日期:2021.6.18
transition-metal-catalyzed allylation reaction is an efficient strategy for the construction of new carbon–carbon bonds alongside allyl or homoallylic functionalization. Herein we describe a Ni-catalyzed reductive allylation of α-chloroboronates to efficiently render the corresponding homoallylic boronates, which could be readily converted into valuable homoallylic alcohols or amines or 1,4-diboronates
过渡金属催化的烯丙基化反应是在烯丙基或均烯丙基官能化的同时构建新碳-碳键的有效策略。在本文中,我们描述了 α-氯硼酸酯的 Ni 催化还原烯丙基化,以有效地生成相应的高烯丙基硼酸酯,其可以很容易地转化为有价值的高烯丙基醇或胺或 1,4-二硼酸酯。该反应具有广泛的底物范围和良好的官能团兼容性,是对现有制备高烯丙基硼酸酯方法的补充。
Perfluoroalkylative pyridylation of alkenes<i>via</i>4-cyanopyridine-boryl radicals
作者:Jia Cao、Guoqiang Wang、Liuzhou Gao、Hui Chen、Xueting Liu、Xu Cheng、Shuhua Li
DOI:10.1039/c8sc05237a
日期:——
developed via a combination of computational and experimental studies. Density functional theory calculations and control experiments indicate that the homolysis of Rf−X (X = Br, I) bonds by the 4-cyanopyridine-boryl radicals in situ generated from 4-cyanopyridine and B2pin2 is the key step. Sequential addition of Rf radicals to alkenes and the selective cross-coupling of the resulting alkyl radicals and
1,2-Silylpyridylation Reaction of Aryl Alkenes with Silylboronate
作者:Liuzhou Gao、Xueting Liu、Guoao Li、Shengda Chen、Jia Cao、Guoqiang Wang、Shuhua Li
DOI:10.1021/acs.orglett.2c02074
日期:2022.8.12
A metal-free silyl-pyridylation of alkenes using silyl boronates and B2pin2 through a pyridine-mediated B-interelement activation has been demonstrated, which provides a practical strategy for a variety of C4-silylalkylated pyridines. DFT calculations and control experiments show that the reaction proceeds through a silyl radical addition/radical–radicalcoupling sequence. This protocol features a
已经证明了使用甲硅烷基硼酸盐和 B 2 pin 2通过吡啶介导的 B 元素间活化对烯烃进行无金属甲硅烷基吡啶基化,这为各种 C 4甲硅烷基烷基化吡啶提供了实用的策略。DFT 计算和控制实验表明,反应通过甲硅烷基自由基加成/自由基-自由基偶联顺序进行。该协议具有广泛的底物范围和优异的官能团兼容性,因此在生物活性分子的后期修饰中展示了巨大的潜力。