Ni-Catalyzed Cycloisomerization between 3-Phenoxy Acrylic Acid Derivatives and Alkynes via Intramolecular Cleavage and Formation of the C–O Bond To Give 2,3-Disubstituted Benzofurans
based on transition-metal-catalyzed C-Obondcleavage have attracted much attention as a new synthetic method. Until now, several intermolecular reactions via C-Obondcleavage of aryl ethers, alkenyl ethers, esters, and others have been reported. Here we report an unprecedented C-Obondcleavage of 3-phenoxy acrylic acid derivatives, followed by intramolecular C-Obond formation with alkynes. This reaction
Facile Synthesis of 2‐Fluorobenzofurans: 5‐
<i>endo</i>
‐
<i>trig</i>
Cyclization of β,β‐Difluoro‐
<i>o‐</i>
hydroxystyrenes
作者:Ryutaro Morioka、Takeshi Fujita、Junji Ichikawa
DOI:10.1002/hlca.202000159
日期:2020.11
synthetic methods were established for obtaining 2‐fluorobenzofurans involving various substituents. Upon being treated with 1,8‐diazabicyclo[5.4.0]undec‐7‐ene under microwave irradiation, the α‐unsubstituted β,β‐difluoro‐o‐hydroxystyrenes underwent nucleophilic 5‐endo‐trig cyclization to afford the corresponding 2‐fluorobenzofurans in high yields. Furthermore, 2‐fluoro‐3‐iodobenzofuran was successfully synthesized
Access to <i>ortho</i>-Hydroxyphenyl Ketimines via Imine Anion-Mediated Smiles Rearrangement
作者:Shunki Jinno、Takahiro Senoo、Keiji Mori
DOI:10.1021/acs.orglett.2c01349
日期:2022.6.17
access to N-(2-halophenyl)-2-hydroxyphenylimine derivatives via imine anion-mediated Smiles rearrangement. When 2-(2-halophenoxy)benzonitriles were treated with 1.2–1.4 equiv of organolithium reagents, nucleophilic addition to the nitrile group followed by Smiles rearrangement occurred to give various N-(2-halophenyl)-2-hydroxyphenylimine derivatives, which are sometimes difficult to synthesize by