A combination of trimethylsilyl chloride and hydrous natural montmorillonite clay: an efficient solid acid catalyst for the azidation of benzylic and allylic alcohols with trimethylsilyl azide
[EN] INTRODUCTION OF ALKYL SUBSTITUENTS TO AROMATIC COMPOUNDS<br/>[FR] INTRODUCTION DE SUBSTITUANTS ALKYLE DANS DES COMPOSÉS AROMATIQUES
申请人:B G NEGEV TECH AND APPLICATIONS LTD AT BEN-GURION UNIV
公开号:WO2016132355A1
公开(公告)日:2016-08-25
Novel selective synthesis route to introduce primary alkyl groups on aromatic compounds is disclosed. The synthesis route is based on electrophilic aromatic substitutions of thionium ion species that are generated in-situ from aldehydes and thiols, affording benzyl sulfide that can be reduced with triethylsilane.
Highly selective direct azidation of alcohols over a heterogeneous povidone–phosphotungstic solid acid catalyst
作者:Sumit Kamble、Sagar More、Chandrashekhar Rode
DOI:10.1039/c6nj02500e
日期:——
A heterogeneous povidone–phosphotungstic acid catalyzed direct selective azidation of alcohols gave excellent product yields at room temperature.
一种异质碘酮-磷钨酸催化的直接选择性醇的叠氮化反应在室温下产率优异。
A combination of trimethylsilyl chloride and hydrous natural montmorillonite clay: an efficient solid acid catalyst for the azidation of benzylic and allylic alcohols with trimethylsilyl azide
作者:Michael A. Tandiary、Yoichi Masui、Makoto Onaka
DOI:10.1039/c4ra13238f
日期:——
We present a new procedure to convert in situ natural montmorillonite clay into a partially acidified one using a catalytic amount of trimethylsilyl chloride and trace water.
我们提出了一种新的程序,使用少量的三甲基氯硅烷和微量水将原位天然蒙脱石粘土部分酸化。
A Direct Brønsted Acid-Catalyzed Azidation of Benzhydrols and Carbohydrates
作者:Jeffery Regier、Robert Maillet、Yuri Bolshan
DOI:10.1002/ejoc.201900104
日期:2019.4.9
HBF4·OEt2 complex was used as an efficient Brønsted acid catalyst for direct azidation reactions on substrates bearing benzhydryl and anomeric alcohols. This methodology demonstrated excellent functional group tolerance to both electron‐rich and electron‐poor benzhydrylalcohols as well as unprotected functional groups.
Copper-Catalyzed Direct Transformation of Secondary Allylic and Benzylic Alcohols into Azides and Amides: An Efficient Utility of Azide as a Nitrogen Source
作者:Balaji V. Rokade、Karthik Gadde、Kandikere Ramaiah Prabhu
DOI:10.1002/ejoc.201500010
日期:2015.4
synthesis of amides has been explored by using secondary alcohols, Cu(ClO4)2·6H2O as a catalyst, and trimethylsilyl azide (TMSN3) as a nitrogen source in the presence of 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ) at ambient temperature. This method has been successfully adapted to the preparation of azides directly from their corresponding alcohols and offers excellent chemoselectivity in the formation