A copper-catalyzedasymmetricallylicsubstitution of γ,γ-disubstituted allylphosphates with arylboronates has been developed for the construction of quaternary stereocenters. High regio- and enantioselectivities have been achieved by employing a hydroxy-bearing chiral N-heterocyclic carbene ligand, and both E and Z substrates provide the same enantiomer as the major product. The mechanistic aspect
Silver(i)-catalyzed carboxylation of arylboronic esters with CO2
作者:Xiao Zhang、Wen-Zhen Zhang、Ling-Long Shi、Chun-Xiao Guo、Ling-Ling Zhang、Xiao-Bing Lu
DOI:10.1039/c2cc32045b
日期:——
A variety of arylboronic esters were efficiently carboxylated with CO2 using a simple AgOAc/PPh3 catalyst, affording the corresponding carboxylic acids in good yield. This simple and efficient silver(I) catalytic system showed wide functional group compatibility.
Selective Monoarylation of Aromatic Ketones and Esters via Cleavage of Aromatic Carbon–Heteroatom Bonds by Trialkylphosphine Ruthenium Catalysts
作者:Hikaru Kondo、Takuya Kochi、Fumitoshi Kakiuchi
DOI:10.1021/acs.orglett.6b03761
日期:2017.2.17
We report here the ruthenium-catalyzed selective monoarylation of aromatic ketones bearing two ortho carbon–heteroatom (O or N) bonds. Under the newly developed catalyst system consisting of RuHCl(CO)(PiPr3)2, CsF, and styrene, the C–O arylation of 2′,6′-dimethoxyacetophenone with a phenylboronate gave the C–O monoarylation product selectively. The selective C–O monoarylation was applicable to a variety
我们在这里报告了钌催化的带有两个邻位碳-杂原子(O或N)键的芳族酮的选择性单芳基化。在由RuHCl(CO)(P i Pr 3)2,CsF和苯乙烯组成的新开发的催化剂体系下,2',6'-二甲氧基苯乙酮与苯基硼酸酯的C–O芳基化选择性地产生了C–O单芳基化产物。选择性C–O单芳基化反应适用于各种芳基硼酸酯和芳族酮,并具有较高的区域选择性和化学选择性。使用芳族酯的C–O单芳基化作为关键步骤,也可以实现正式的交替烯醇合成。
Ruthenium-Catalyzed α-(Hetero)Arylation of Saturated Cyclic Amines: Reaction Scope and Mechanism
作者:Aldo Peschiulli、Veerle Smout、Thomas E. Storr、Emily A. Mitchell、Zdeněk Eliáš、Wouter Herrebout、Didier Berthelot、Lieven Meerpoel、Bert U. W. Maes
DOI:10.1002/chem.201204438
日期:2013.7.29
3‐ethyl‐3‐pentanol. A systematic study on the substrate and reagent scope of this transformation is disclosed in this paper. The effect of substitution on both the piperidine ring and the arylboronic ester has been investigated. Smaller (pyrrolidine) and larger (azepane) saturated ring systems, as well as benzoannulated derivatives, were found to be compatible substrates with the α‐arylation protocol. The successful
Nickel-Catalyzed Decarbonylative Borylation of Amides: Evidence for Acyl C−N Bond Activation
作者:Jiefeng Hu、Yue Zhao、Jingjing Liu、Yemin Zhang、Zhuangzhi Shi
DOI:10.1002/anie.201603068
日期:2016.7.18
nickel/N‐heterocycliccarbenecatalytic system has been established for decarbonylative borylation of amides with B2nep2 by C−N bond activation. This transformation shows good functional‐group compatibility and can serve as a powerful synthetic tool for late‐stage borylation of amide groups in complex compounds. More importantly, as a key intermediate, the structure of an acyl nickel complex was first