Structural and solvent/electrolyte effects on the selectivity and efficiency of the anodic oxidation of para-substituted aromatic ethers. An efficient route to quinol ether ketals and quinol ethers
Structural and solvent/electrolyte effects on the selectivity and efficiency of the anodic oxidation of para-substituted aromatic ethers. An efficient route to quinol ether ketals and quinol ethers
Solvent-switchable regioselective 1,2- or 1,6-addition of quinones with boronic acids
作者:Qi Xia、Yaxuan Zhou、Xiaoning Yang、Yanqiu Zhang、Jiayi Wang、Gonghua Song
DOI:10.1039/d3cc01968c
日期:——
An efficient copper-catalyzed solvent-switchable regioselective 1,2- or 1,6-addition of quinones with boronic acids has been developed. This novel catalytic protocol for the synthesis of various quinols and 4-phenoxyphenols was enabled by a simple solvent swap between H2O and MeOH. It features mild reaction conditions, simple and easy operation, broad substrate scope and excellent regioselectivity
已经开发出一种有效的铜催化溶剂可转换的醌与硼酸的区域选择性 1,2-或 1,6-加成反应。这种用于合成各种对苯二酚和 4-苯氧基苯酚的新颖催化方案是通过 H 2 O 和 MeOH 之间的简单溶剂交换实现的。其具有反应条件温和、操作简单易行、底物范围广、区域选择性优良等特点。还成功地研究了克级反应以及两种加成产物的进一步转化。
Phosphine-Catalyzed Dual Umpolung Domino Michael Reaction: Facile Synthesis of Hydroindole- and Hydrobenzofuran-2-Carboxylates
作者:Kenta Kishi、Shinobu Takizawa、Hiroaki Sasai
DOI:10.1021/acscatal.8b01011
日期:2018.6.1
A highly atom-economical, chemoselective, and stereoselective Lewis base (LB)-catalyzed dual umpolung domino Michael reaction between cyclohexadienones and alkynyl esters has been developed. PPh3, as a LB catalyst, afforded either the hydroindole-2-carboxylates or hydrobenzofuran-2-carboxylates 3 as a single diastereomer in high yields (up to 89%). An obtained product could be easily transformed to a (S*,S*,R*)-octahydroindole-2-carboxylic acid ((S*,S*,R*)-Oic) analogue.
CAPPARELLI, MICHAEL P.;DESCHEPPER, RICHARD E.;SWENTON, JOHN S., J. ORG. CHEM., 52,(1987) N 22, 4953-4961
作者:CAPPARELLI, MICHAEL P.、DESCHEPPER, RICHARD E.、SWENTON, JOHN S.