An efficient in situ prepared superacid BF3–H2O promoted benzylation of arenes using benzyl alcohols and acetates achieves various diarylalkanes.
一种高效的原位制备的超强酸BF3-H2O促进的芳烃苄基化反应,使用苄醇和醋酸酯制备各种二芳基烷烃。
Benzylation of arenes with benzyl ethers promoted by the in situ prepared superacid BF3–H2O
作者:Yu Li、Yan Xiong、Xueming Li、Xuege Ling、Ruofeng Huang、Xiaohui Zhang、Jianchun Yang
DOI:10.1039/c4gc00005f
日期:——
An efficient and environmentally friendly benzylation of arenes with benzyl ethers as benzyl donors using BF3âEt2O to generate in situ the superacid BF3âH2O as an efficient promotor has been described. A wide variety of functional groups have been investigated and found to be compatible to give the desired diarylmethanes in yields of up to 99%. The crucial role of the moisture content in this transformation has been demonstrated by detailed investigations.
Mn-Catalyzed oxidative amination of benzylic C(sp3)–H bonds with nitriles is disclosed, which enables the synthesis of a broad range of secondary amides in moderate to excellent yields under mild conditions. The interaction between Mn(III) and DDQ facilitates the oxidation and makes it highlyefficient and selective.
A Study of <i>N</i>-Nitrosoamide-Mediated Friedel−Crafts Type Benzylation of Benzene−Toluene and Benzene−Anisole<sup>1</sup><sup>a</sup>
作者:Ron W. Darbeau、Emil H. White
DOI:10.1021/jo9916378
日期:2000.2.1
deuterium rearrangements (or coupled benzyl rearrangements) in the arenium ion intermediate. Kinetic isotope effects were not detected. The methyl substituent on toluene appears to affect intermolecular selectivity (k(T)/k(B)) and intramolecular selectivity (o, m, p distribution) to similar degrees. A mechanism is proposed in which both selectivities are determined by activation energy differences in
DDQ-Catalyzed Oxidative CO Coupling Of sp<sup>3</sup>CH Bonds With Carboxylic Acids
作者:Hong Yi、Qiang Liu、Jie Liu、Ziqi Zeng、Yuhong Yang、Aiwen Lei
DOI:10.1002/cssc.201200458
日期:2012.11
catalytic amounts of DDQ combined with MnO2 as oxidant, an efficient oxidative CO coupling of benzylic sp3 CH bonds with carboxylic acids affords a series of carboxylic esters in 70–98 % yields. A wide range of functional groups and various carboxylic acids are tolerated. The reaction involves both CH functionalization and CO bond formation.