Base‐Mediated O‐Arylation of Alcohols and Phenols by Triarylsulfonium Triflates
作者:Xiao‐Xia Ming、Ze‐Yu Tian、Cheng‐Pan Zhang
DOI:10.1002/asia.201900968
日期:2019.10
A mild and efficient protocol for O-arylation of alcohols and phenols (ROH) by triarylsulfonium triflates was developed under transition-metal-free conditions. Various alcohols, including primary, secondary and tertiary, and phenols bearing either electron-donating or electron-withdrawing groups on the aryl rings were smoothly converted to form the corresponding aromatic ethers in moderate to excellent
The chemistry of pentavalent organobismuth reagents. Part 8. Phenylation and oxidation of alcohols by tetraphenylbismuth esters
作者:Derek H. R. Barton、Jean-Pierre Finet、William B. Motherwell、Clotilde Pichon
DOI:10.1039/p19870000251
日期:——
Tetraphenylbismuth trifluoroacetate under neutral or slightly acidic conditions O-phenylates primary alcohols in reasonable (65–75%) yield, but gives only moderate yields with secondary alcohols and no O-phenylation with tertiary alcohols. An SN2 type mechanism is proposed with attack of oxygen on aryl carbon. In contrast, the reaction of BiV reagents with alcohols under basic conditions gives, exclusively
下中性或微酸性条件Tetraphenylbismuth三氟ö -phenylates在合理(65-75%)产率的伯醇,但只给出中等产率与仲醇和没有ö -phenylation与叔醇。提出了一种S N 2型机理,其中氧攻击芳基碳。相反,在碱性条件下,Bi V试剂与醇的反应通常仅以苯作为离去基团进行氧化。使用核磁共振光谱已通过几种不同方式证明了具有铋-氧键的Bi V中间体的存在。因此,醇与Bi V试剂的反应与相应的与酚的反应平行。
Copper(II)-Catalyzed Ether Synthesis from Aliphatic Alcohols and Potassium Organotrifluoroborate Salts
作者:Tan D. Quach、Robert A. Batey
DOI:10.1021/ol034454n
日期:2003.4.1
for the copper(II)-catalyzed etherification of aliphatic alcohols under mild and essentially neutral conditions is described. Air- and moisture-stable potassium alkenyl- and aryltrifluoroborate salts undergo cross-coupling with a variety of aliphatic primary and secondary alcohols and phenols, and are tolerant of a range of functional groups. The optimized conditions utilize catalytic copper(II) acetate
Forging C–C Bonds with Hindered Nucleophiles and Carbonyl Electrophiles: Reactivity and Selectivity of Allylic Tin Reagents/<i>n</i>-BuLi
作者:Morgan Cormier、Maha Ahmad、Jacques Maddaluno、Michaël De Paolis
DOI:10.1021/acs.organomet.7b00765
日期:2017.12.26
tertiary alcohols that are vicinal to quaternary carbons. With α,α′-dimethoxy-γ-pyrone, on the other hand, the grafting of a dienyl side chain was effected to prepare dienyl α′-methoxy-γ-pyrone in a stereo- and regioselective and convergent manner. Furthermore, the advantages of this route were highlighted for the preparation of organolithium species at low temperature with the formation of a minimum
Intramolecular Arylation Reactions of Alkenes: A Flexible Approach to Chromans and Tetrahydroquinoline Derivatives
作者:José Barluenga、Mónica Trincado、Eduardo Rubio、José M. González
DOI:10.1021/ja0397299
日期:2004.3.1
A metal-free approach to chroman derivatives by the reaction of different allylphenyl ethers with Ipy2BF4 is described. The access to this frame, by direct cyclization of the starting materials, takes place smoothly. In addition, an unusual and selective sequence that comprises initial rearrangement and further cyclization could be accomplished, with temperature as an excellent element of control.