Axially Chiral 1,1'‐Binaphthyl‐2‐Carboxylic Acid (BINA‐Cox) as Ligands for Titanium‐Catalyzed Asymmetric Hydroalkoxylation
作者:Sebastian L. Helmbrecht、Johannes Schlüter、Max Blazejak、Lukas Hintermann
DOI:10.1002/ejoc.201901895
日期:2020.4.16
1'‐biaryl‐2‐carboxylic acids, a catalyst for the asymmetric addition of phenolic hydroxyl to non‐activated alkene at hightemperature (240 °C) is formed. This work systematically develops scalable syntheses of variably decorated, enantiopure 1,1'‐biaryl‐2'‐carboxylic acids, which are then tested as steering ligands in intramolecular asymmetric catalytic hydroalkoxylation reactions.
Identification of a Boron-Containing Intermediate in the Boron Tribromide Mediated Aryl Propargyl Ether Cleavage Reaction
作者:Min-Liang Yao、Marepally Srinivasa Reddy、Wenbin Zeng、Kelly Hall、Ingrid Walfish、George W. Kabalka
DOI:10.1021/jo802207y
日期:2009.2.6
An alternate reaction mechanism for the boron tribromide mediated deprotection of aryl propargyl ethers based on the isolation of a key boron-containing byproduct is proposed. On the basis of the new mechanistic insight, we discovered that HBBr2·SMe2 can also be used for cleaving aryl propargyl ethers.
palladium-catalyzed cross-coupling of o-allylic and o-vinylic phenols with vinylic halides and triflates produces substituted dihydrobenzopyrans and dihydrobenzofurans respectively in good to high yields. The proposed mechanism involves vinylpalladium addition to the olefin, rearrangement to a π-allylpalladium intermediate and subsequent intramolecular nucleophilic displacement of palladium.
Palladium-catalyzed cross-coupling of unsaturated phenols with vinylic halides and triflates
作者:Richard C. Larock、Hoseok Yang、Paola Pace、Sandro Cacchi、Giancarlo Fabrizi
DOI:10.1016/s0040-4039(97)10502-0
日期:1998.1
The palladium-catalyzed cross-coupling of o-vinylic phenols with vinylic halides and triflates produces substituted dihydrobenzopyrans and dihydrobenzofurans respectively in good to high yields.
[EN] PRODUCTION OF 3-ALKYLPHENOLS AND USES THEREOF<br/>[FR] PRODUCTION DE 3-ALKYLPHÉNOLS ET LEURS UTILISATIONS
申请人:UNIV LEUVEN KATH
公开号:WO2016187678A1
公开(公告)日:2016-12-01
In general the present invention concerns a method for conversion of particular 4-alkyl-2- hydroxyphenols and 4-alkyl-2-alkoxyphenols into 3-alkylphenols. More specifically, this invention relates to a novel process of selectively forming meta-alkyl phenols of various alkylphenols, such as for instance converting the fraction of 4-alkyl-2-hydroxyphenols and 4- alkyl-2-alkoxyphenols into high yields of 3-alkylphenols.