La 反应 de trifluoromethanesulfonate de 6-trimethyllyylylcyclohexa-1,5-dinyle avec le CsF dans le DMSO donne le cyclohexa-1,2,3-triene qui est piege par le diphenylbenzo[c]furane etfournit l'adduit 通讯员。Le cyclohex-1-en-3-yne est 合成 a partir de 2-bromocyclohexa-1,3-dienyl trimethyl 硅烷 et est piege de la meme maniere
ortho-Difunctionalization of arynes by LiZnEt2(TMP)-mediated deprotonative zincation/elimination of aryl triflates
作者:Seoyoung Cho、Qiu Wang
DOI:10.1016/j.tet.2018.03.044
日期:2018.6
Generation of arynes from aryl triflates has been achieved using lithium diethyl(tetramethylpiperidyl)-zincate base LiZnEt2(TMP), via a directed ortho-deprotonative zincation and subsequent elimination of the triflate group. The aryne formation has been demonstrated by the cycloaddition reaction with diene and insertion reactions with ureas. Furthermore, the nucleophilicaddition of LiZnEt2(TMP) to
Acylalkylation of Arynes Generated from <i>o</i>-Iodoaryl Triflates with Hydrosilanes and Cesium Fluoride
作者:Mai Minoshima、Keisuke Uchida、Yu Nakamura、Takamitsu Hosoya、Suguru Yoshida
DOI:10.1021/acs.orglett.1c00279
日期:2021.3.5
An efficient method to generate aryne intermediates from o-iodoaryl triflates triggered by triethylsilane and cesiumfluoride is disclosed. This method realized the acylalkylation of arynes using easily available o-iodoaryl triflate-type precursors, which was difficult when using conventional nucleophilic activators. A wide range of (hetero)arenes including various fused benzothiazoles were successfully
Pseudocyclic Arylbenziodoxaboroles: Efficient Benzyne Precursors Triggered by Water at Room Temperature
作者:Akira Yoshimura、Jonathan M. Fuchs、Kyle R. Middleton、Andrey V. Maskaev、Gregory T. Rohde、Akio Saito、Pavel S. Postnikov、Mekhman S. Yusubov、Victor N. Nemykin、Viktor V. Zhdankin
DOI:10.1002/chem.201704393
日期:2017.11.27
New organohypervalent iodine compounds, arylbenziodoxaborole triflates, were prepared from 1‐acetoxybenziodoxaboroles and arenes by treatment with trifluoromethanesulfonic acid under mild conditions. Single crystal X‐ray crystallography of these compounds revealed a pseudocyclic structure with a short intramolecular interaction of 2.698 to 2.717 Å between oxygen and iodine in the benziodoxaborole ring
6-tetramethylpiperidino)zincate (R2Zn(TMP)Li) through deprotonative zincation as a key reaction. In this system, by choosing appropriate ligands for the zincate, either regioselective zincation of functionalized haloaromatics or the generation of substituted benzynes can be controlled in good yields with excellent chemoselectivity, using the same substrate. Zincation with (t)Bu2Zn(TMP)Li followed by electrophilic
key reaction using R2Zn(TMP)Li, and we also describes dramatic ligand effects on the benzyne formation. Deprotonative zincation of various meta-substituted bromobenzenes with Me2Zn(TMP)Li proved effective for the one-pot generation of various 3-functionalized benzynes, particularly those electrophilic substituents such as ester, amide, and cyano. On the other hand, zincation with tBu2Zn(TMP)Li, followed