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 Monoarylation of Vicinal Diols with Diaryliodonium Salts
Selective and efficient: The copper(II)‐catalyzed selective monoarylation of vicinaldiols with diaryliodonium triflates was successfully developed. In this catalytic process high chemoselectivity was achieved, even in the presence of a 1:1 mixture of the 1,2‐diol and the mono‐ol, and a wide range of substrates was tolerated, giving the monoarylated products in good to excellent yields (see scheme)
The catalytic effect of copper ions in the phenylation reaction of david and thieffry
作者:Derek H. R. Barton、Jean-Pierre Finet、Clotilde Pichon
DOI:10.1039/c39860000065
日期:——
Several types of bifunctional molecules are smoothly phenylated by triphenylbismuth diacetate in a reaction which has an intduction period, a curious solvent dependence, and the need for illumination; however, the addition of a small amount of Cu(OAc)2 removes all these limitations and accelerates greatly the reaction.
Synthesis and reactivity of pentavalent biphenyl-2,2′-ylenebismuth derivatives
作者:Alexey Yu. Fedorov、Jean-Pierre Finet
DOI:10.1039/b006307j
日期:——
Phenylbiphenyl-2,2â²-ylenebismuth diacetate reacted with nucleophiles under basic conditions to give modest to good yields of the C-phenylated substrates. Under copper catalysis, it reacted with hydroxy or amino groups to give the products of O- or N-phenylation. In both sets of reaction conditions, this reagent showed a reduced reactivity compared to the analogous triphenylbismuth diacetate reagent. It showed also a high regioselectivity as only the phenyl derivatives were detected and isolated.
Diastereoselective Reductive Etherification Via High-Throughput Experimentation: Access to Pharmaceutically Relevant Alkyl Ethers
作者:Jiantao Fu、Zoe Vaughn、Andrew F. Nolting、Qi Gao、Dexi Yang、Christopher H. Schuster、Dipannita Kalyani
DOI:10.1021/acs.joc.3c00822
日期:2023.10.6
This manuscript describes the development of the first diastereoselective intermolecular synthesis of alkyl ethersviareductive etherification of diverse ketones or aldehydes with alcohols. Key to this development was the use of low-temperature high-throughput experimentation (HTE) technologies that enabled rapid reaction optimizations and parallel synthesis. A broad scope of pharmaceutically relevant