Salicylic Acid‐Catalyzed Arylation of Enol Acetates with Anilines
作者:Diego Felipe‐Blanco、Jose C. Gonzalez‐Gomez
DOI:10.1002/adsc.201800427
日期:2018.7.16
α‐Arylketones are both structure moieties commonly found in bioactive compounds and versatile synthetic intermediates for the preparation of drug‐like molecules. An operationally simple and scalable protocol has been developed to prepare α‐arylketonesfrom readily available aromatic amines and enolacetates (or silyl enol ethers). This metal‐free methodology features the use of salicylic acid as
Aerobic, Transition-Metal-Free, Direct, and Regiospecific Mono-α-arylation of Ketones: Synthesis and Mechanism by DFT Calculations
作者:Qing-Long Xu、Hongyin Gao、Muhammed Yousufuddin、Daniel H. Ess、László Kürti
DOI:10.1021/ja4074563
日期:2013.9.25
We disclose a facile, aerobic, transition-metal-free, direct, and regiospecific mono-α-arylation of ketones to yield aryl benzyl and (cyclo)alkyl benzyl ketones with substitution patterns that are currently inaccessible or challenging to prepare using conventional methods. The transformation is operationally simple, scalable, and environmentally friendly. There is no need for pre-functionalization
我们公开了一种简便、有氧、无过渡金属、直接和区域特异性的酮单-α-芳基化,以产生芳基苄基和(环)烷基苄基酮,其取代模式目前无法使用常规方法制备或难以制备。转型操作简单、可扩展且环保。不需要预官能化(即α-卤化或甲硅烷基烯醇醚形成)或使用专门的芳基化剂(即二芳基碘盐)。DFT 计算表明,原位生成的烯醇化物与硝基芳烃直接形成 CC 键,然后进行区域选择性 O2 介导的 CH 氧化。
Copper-Assisted Direct Nitration of Cyclic Ketones with Ceric Ammonium Nitrate for the Synthesis of Tertiary α-Nitro-α-substituted Scaffolds
作者:Zhi-Qiang Zhang、Tao Chen、Fu-Min Zhang
DOI:10.1021/acs.orglett.7b00040
日期:2017.3.3
An efficient and direct Cu-assisted nitrating approach to create synthetically valuable and challenging tertiary α-nitro-α-substituted moieties has been developed using cericammoniumnitrate as a nitrating reagent, oxidant, and Lewis acid. Notably, the commonly used clinical drug ketamine was smoothly synthesized in four steps.
Pd-catalyzed arylation of silyl enol ethers of substituted α-fluoroketones
作者:Yong Guo、Brendan Twamley、Jean'ne M. Shreeve
DOI:10.1039/b900311h
日期:——
the Pd-catalyzed cross-coupling of aryl bromides with either α-fluoroketones or their corresponding silyl enol ethers. The direct arylation with an α-fluoroketone requires a strong base, such as potassium tert-butoxide, and under these conditions the presence of a base-sensitive functional group is not compatible. However, good functional tolerance was achieved when the anionic coupling moieties were
A novel method was developed for the construction of biologically active poly-substituted cinnolines from easily accessible hydrazones in good to excellent yields. A simple copper catalyst could efficiently promote C−N bond formation through selective C−H functionalization and dehydrogenative amination. Furthermore, the inert C−Heteroatom (O/F/N) bonds are susceptible to cleavage in high selectivity
开发了一种新颖的方法,用于以易于获得的azo为原料,以良好或优异的产率构建具有生物活性的多取代cinnolines。一个简单的铜催化剂可以通过选择性的CH功能化和脱氢胺化有效地促进C N键的形成。此外,在新开发的好氧环化反应中,惰性C-杂原子(O / F / N)键易于以高选择性裂解,而不是保留完整的替代C-H键。