Deprotonation of a trimethylsilylmethaneboronic ester
作者:Donald S. Matteson、Debesh Majumdar
DOI:10.1039/c39800000039
日期:——
Deprotonation of pinacol trimethylsilylmethaneboronate yields an anion which reacts with carbonyl compounds to form alkeneboronic esters, or with alkyl halides to form α-trimethylsilylalkaneboronic esters.
An efficient Cu-catalyzed C–H alkenylation with acyclic and cyclic vinyl boronates was realized for the first time under mild conditions. The scope of the vinyl borons and the compatibility with functional groups including heterocycles are superior than Pd-catalyzed C–H coupling with vinyl borons, providing a reliable access to multisubstituted alkenes and dienes. Subsequent hydrogenation of the product
The Boron-Wittig Olefination of Aldehydes and Ketones with Bis[(pinacolato)boryl]methane: an Extended Reaction Scope
作者:Maksym Kovalenko、Dmytro V. Yarmoliuk、Dmytro Serhiichuk、Daria Chernenko、Vladyslav Smyrnov、Artur Breslavskyi、Oleksandr V. Hryshchuk、Ihor Kleban、Yuliya Rassukana、Andriy V. Tymtsunik、Andrey A. Tolmachev、Yuliya O. Kuchkovska、Oleksandr O. Grygorenko
DOI:10.1002/ejoc.201900648
日期:2019.9.8
The boron‐Wittig olefination of aliphatic and aromaticketones and aldehydes with bis[(pinacolato)boryl]methane is described. The 2,2‐disubstituted and 2‐monosubstituted alkenylboronic acid esters were obtained on a multigram scale with 35–90 % yield.
<i>para</i>-Selective arylation and alkenylation of monosubstituted arenes using thianthrene <i>S</i>-oxide as a transient mediator
作者:Xiao-Yue Chen、Xiao-Xue Nie、Yichen Wu、Peng Wang
DOI:10.1039/d0cc00641f
日期:——
Using thianthrene S-oxide (TTSO) as a transient mediator, para-arylation and alkenylation of mono-substituted arenes have been demonstrated via a para-selective thianthrenation/Pd-catalyzed thio-Suzuki-Miyaura coupling sequence under mild conditions. This reaction features a broad substrate scope, and functional group and heterocycle tolerance. The versatility of this approach was further demonstrated