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。
A NOVEL NUCLEOPHILIC SUBSTITUTION OF THE FORMYL GROUP IN p-NITROBENZALDEHYDE WITH SOME CARBANIONS
作者:Genji Iwasaki、Seitaro Saeki、Masatomo Hamana
DOI:10.1246/cl.1986.173
日期:1986.2.5
p-Nitrobenzaldehyde reacts with some active methylene compounds in the presence of a strong base at low temperatures to give p-substituted nitrobenzenes by the two-step course involving the initial formation of the aldol adducts and the subsequent displacement of the carbinol moieties with excess carbanions.
Porphyrins as Photoredox Catalysts in Csp<sup>2</sup>–H Arylations: Batch and Continuous Flow Approaches
作者:Aline A. N. de Souza、Nathalia S. Silva、Andressa V. Müller、André S. Polo、Timothy J. Brocksom、Kleber T. de Oliveira
DOI:10.1021/acs.joc.8b02355
日期:2018.12.21
We have investigated both batch and continuous flow photoarylations of enol-acetates to yield different α-arylated aldehyde and ketone building blocks by using diazonium salts as the aryl-radical source. Different porphyrins were used as SET photocatalysts, and photophysical as well as electrochemical studies were performed to rationalize the photoredox properties and suggest mechanistic insights.
NUCLEOPHILIC SUBSTITUTION OF p-DINITROBENZENE WITH SOME CARBANIONS. FORMATION OF p-SUBSTITUTED NITROBENZENES
作者:Genji Iwasaki、Seitaro Saeki、Masatomo Hamana
DOI:10.1246/cl.1986.31
日期:1986.1.5
Treatment of p-dinitrobenzene with active methylene compounds of rather weak acidity in the presence of t-BuOK in liq NH3 at −70 °C leads to nucleophilicsubstitution of a nitro group, giving p-substituted nitrobenzenes in generally good yields.
在 t-BuOK 的 NH3 溶液中,在 -70 °C 下,用酸性相当弱的活性亚甲基化合物处理对二硝基苯会导致硝基亲核取代,从而以通常良好的产率得到对位取代的硝基苯。
IWASAKI, GENJI;SAEKI, SEITARO;HAMANA, MASATOMO, CHEM. LETT., 1986, N 1, 31-34