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
作者:Isuru Dissanayake、Jacob D. Hart、Emma C. Becroft、Christopher J. Sumby、Christopher G. Newton
DOI:10.1021/jacs.0c06306
日期:2020.8.5
5-Bis(tert-butyldimethylsilyloxy)furans are established as vicinal bisketene equivalents for application as dienes in the Diels-Alderreaction. Cycloaddition with olefinic dienophiles, under exceptionally mild conditions, enables convergent access to highly substituted para-hydroquinones in unprotected form via a one-pot Diels-Alder/ring-opening/tautomerization sequence. The synthesis of para-benzoquinones from
Facile Preparation of 2-Iodophenyl Trifluoromethanesulfonates: Superior Aryne Precursors
作者:Timothy Snowden、Ashok Ganta
DOI:10.1055/s-2007-985565
日期:——
A comparative study of 3-methoxyaryne precursors revealed 2-iodo-3-methoxyphenyl triflate as the most effective in nonpolar solvent. Use of Hoppe’s N-isopropyl carbamate allows for the systematic preparation of a variety of 2-iodophenyl triflates via a directed ortho-lithiation-iodination-decarbamation sequence. These steps are possible without isolation of the intermediate iodophenyl carbamates.
Generation of Arynes Using Trimethylsilylmethyl Grignard Reagent for Activation of <i>ortho</i>-Iodoaryl or <i>ortho</i>-Sulfinylaryl Triflates
作者:Suguru Yoshida、Keisuke Uchida、Takamitsu Hosoya
DOI:10.1246/cl.150060
日期:2015.5.5
The trimethylsilylmethyl Grignard reagent triggered efficient generation of arynes from various ortho-iodoaryl or ortho-sulfinylaryl triflates. The moderate nucleophilicity and basicity of the reagent facilitated efficient reactions between the aryne precursors and arynophiles containing organometallic nucleophile-sensitive functionalities.
The synthetic utility of 3-thioaryne intermediates has been demonstrated through an aryne relay approach. The efficient synthesis of o-silylaryl triflate-type 3-thioaryne precursors has been achieved by the regioselective silylthiolation of 3-(triflyloxy)arynes with silyl sulfides. Various 3-thioarynes were successfully generated from these precursors and reacted with various arynophiles to afford