The conversion of cyclohexanone and substituted cyclohexanones to alkylarylethersusing a Pd/C-ethylene system is discussed, where ethylene functions as a hydrogen acceptor. The obtained ethers are easily transformed into the corresponding phenols by treatment with BBr3. Direct conversion of cyclohexenone to phenol in the presence of a catalytic amount of Pd/C under an ethylene atmosphere is also
Copper Catalyzed sp<sup>3</sup> C–H Etherification with Acyl Protected Phenols
作者:Tolani K. Salvador、Charles H. Arnett、Subrata Kundu、Nicholas G. Sapiezynski、Jeffery A. Bertke、Mahdi Raghibi Boroujeni、Timothy H. Warren
DOI:10.1021/jacs.6b09057
日期:2016.12.28
A variety of acyl protected phenols AcOAr participate in sp3 C-H etherification of substrates R-H to give alkyl aryl ethers R-OAr employing tBuOOtBu as oxidant with copper(I) β-diketiminato catalysts [CuI]. Although 1°, 2°, and 3° C-H bonds may be functionalized, selectivity studies reveal a preference for the construction of hindered, 3° C-OAr bonds. Mechanistic studies indicate that β-diketiminato
Use of Sonication for the Coupling of Sterically Hindered Substrates in the Phenolic Mitsunobu Reaction
作者:Salvatore D. Lepore、Yuanjun He
DOI:10.1021/jo0345751
日期:2003.10.1
A vast rate increase in the Mitsunobu reaction of phenols with alcohols where either or both are stericallyhindered has been achieved by the use of high concentration combined with sonication.
MCM-41-immobilized 1,10-phenanthroline–copper(<scp>i</scp>) complex: a highly efficient and recyclable catalyst for the coupling of aryl iodides with aliphatic alcohols
作者:Yang Lin、Mingzhong Cai、Zhiqiang Fang、Hong Zhao
DOI:10.1039/c6ra19825b
日期:——
A heterogeneous C–O coupling reaction between aryl iodides and aliphatic alcohols was achieved in neat alcohol or toluene at 110 °C in the presence of 10 mol% of the MCM-41-immobilized 1,10-phenanthroline–copper(I) complex [MCM-41-1,10-phen–CuI] with Cs2CO3 as a base, yielding a variety of aryl alkyl ethers in good to excellent yields. The new heterogeneous copper catalyst can easily be prepared by
在存在10 mol%的MCM-41固定的1,10-菲咯啉-铜(I)络合物的存在下,在110°C的纯醇或甲苯中,芳基碘化物和脂肪醇之间的异质C-O偶联反应得以实现[以Cs 2 CO 3为碱的MCM-41-1,10-phen-CuI] ,可产生各种芳基烷基醚,收率好至极佳。新的多相铜催化剂可以很容易地通过简单的方法由市售和廉价的试剂制备,并通过过滤反应溶液进行回收并循环至少8次而不会显着降低活性。
Copper-Catalyzed Etherification of Aryl Iodides Using KF/Al<sub>2</sub>O<sub>3</sub>: An Improved Protocol
A simple and efficient method for the coupling of aryl iodides with aliphatic alcohols and phenols that does not require the use of alkoxide bases is described. This C-O bond forming procedure shows that the combination of air stable CuI and 1,10-phenanthroline in the presence of KF/Al2O3 comprises an extremely efficient and general catalyst system for the etherification of aryl iodides. Different functionalized aryl iodides were coupled with alcohols and phenols using this method.
本文介绍了一种无需使用氧化烷基即可实现芳基碘化物与脂肪醇和苯酚偶联的简单而高效的方法。这一 C-O 键形成过程表明,在 KF/Al2O3 存在下,空气稳定的 CuI 和 1,10-菲罗啉的组合是芳基碘化物醚化过程中极为高效的通用催化剂体系。用这种方法将不同官能化的芳基碘化物与醇类和酚类偶联。