Direct Synthesis of Alkenylboronates from Alkenes and Pinacol Diboron via Copper Catalysis
作者:Wenkui Lu、Zengming Shen
DOI:10.1021/acs.orglett.8b03599
日期:2019.1.4
We report an efficient approach for the direct synthesis of alkenylboronates using copper catalysis. The Cu/TEMPO catalyst system (where TEMPO = (2,2,6,6-tetramethylpiperidin-1-yl)oxyl) exhibits both excellent reactivity and selectivity for the synthesis of alkenylboronates, starting from inexpensive and abundant alkenes and pinacol diboron. This approach allows for the direct functionalization of
Copper-catalyzed decarboxylative hydroboration of phenylpropiolic acids under ligand-free or both ligand- and base-free conditions
作者:Ying-Wei Zhao、Qiang Feng、Qiu-Ling Song
DOI:10.1016/j.cclet.2016.02.012
日期:2016.4
An efficient copper-catalyzed decarboxylative hydroboration of phenylpropiolic acids with bis(pinacolato)diboron was developed, affording β-vinylboronates as the only products in high yields. Extra hydrogen sources such as methanol are not needed in this catalytic system. This reaction could be performed successfully under ligand- and base-free conditions. It demonstrated that phenylpropiolic acids can
Transition‐Metal‐Free Deaminative Vinylation of Alkylamines
作者:Jiefeng Hu、Bo Cheng、Xianyu Yang、Teck‐Peng Loh
DOI:10.1002/adsc.201900576
日期:2019.11.5
reactivity is the utilization of pyridinium salt‐activated alkylamines, with a base as a promoter. The transformation exhibits good functional group compatibility, and includes inexpensive primary amine feedstocks and aminoacids. The proposed method can serve as a powerful synthetic method for late‐stage modification of complex compounds. Mechanistic experiments suggest that free radical processes are
Copper‐Photocatalyzed Hydroboration of Alkynes and Alkenes
作者:Mingbing Zhong、Yohann Gagné、Taylor O. Hope、Xavier Pannecoucke、Mathieu Frenette、Philippe Jubault、Thomas Poisson
DOI:10.1002/anie.202101874
日期:2021.6.21
photocatalytic hydroboration of alkenes and alkynes is reported. The use of newly-designed copper photocatalysts with B2Pin2 permits the formation a boryl radical, which is used for hydroboration of a large panel of alkenes and alkynes. The hydroborated products were isolated in high yields, with excellent diastereoselectivities and a high functional group tolerance under mild conditions. The hydroboration reactions
报道了烯烃和炔烃的光催化硼氢化反应。使用新设计的铜光催化剂和 B 2 Pin 2可以形成硼基自由基,该自由基可用于大量烯烃和炔烃的硼氢化反应。硼氢化产物以高产率分离,在温和条件下具有优异的非对映选择性和高官能团耐受性。硼氢化反应是在连续流动条件下开发的,以证明其合成效用。研究了反应机理,并提出了原位形成的硼酸盐和处于激发态的铜光催化剂之间的氧化反应,以形成硼基自由基。
Efficient heterogeneous hydroboration of alkynes: enhancing the catalytic activity by Cu(0) incorporated CuFe<sub>2</sub>O<sub>4</sub> nanoparticles