An electron rich, new co-operative iridium(III) complex catalysed tandem conversion of α,β-unsaturated ketones to the α-methylated ketones is described using methanol. Employing this chemoselective protocol, reductive methylation of a wide range of chalcone derivatives, variety of aryl and aliphatic fragment containing α,β-unsaturated ketones along with few biologically important molecules were effectively
Well-Defined Bis(NHC)Mn(I) Complex Catalyzed Tandem Transformation of α,β-Unsaturated Ketones to α-Methylated Ketones Using Methanol
作者:Kasturi Ganguli、Adarsha Mandal、Sabuj Kundu
DOI:10.1021/acscatal.2c04131
日期:2022.10.7
Tandem transformation of α,β-unsaturated ketones to α-methylated ketones by utilizing methanol as both the hydrogen and C1 sources is reported in the presence of a phosphine-free bis-N-heterocyclic carbene-Mn(I) (bis-NHC-Mn(I)) catalyst. The dehydrogenative coupling between methanol and α,β-unsaturated ketones produces the corresponding α-methylated ketones along with 1 equiv of formaldehyde and water
Herein, a B2pin2-mediated radical cascade cyclization/aromatization reaction of enaminone with pyridine is described. This strategy provides a practical way for the construction of valuable functionalized indolizines under metal-, external oxidant-, and base-free conditions, which could be compatible with various kinds of functional groups, such as halogen, π-system, heterocycle, ferrocenyl, etc. A
在此,描述了烯胺酮与吡啶的 B 2 pin 2介导的自由基级联环化/芳构化反应。该策略为在无金属、无外部氧化剂和无碱条件下构建有价值的功能化中氮化合物提供了一种实用的方法,它可以与各种功能基团相容,如卤素、π-系统、杂环、二茂铁基、 etc. 初步的机理研究表明,原位形成的吡啶-硼基自由基引发了反应的发生。
The α-C–H trifluoromethylthiolation of N,N-disubstituted enaminones has been achieved with simple and cheap CF3SO2Na as the CF3S source. The reactions were run at mild temperature (0 °C to rt) using POCl3 as the only reducing reagent. The work represents the first example on the synthesis of α-trifluoromethylthio enaminones via direct C–H functionalization. In addition, the resulting CF3S-functionalized
以简单且廉价的CF 3 SO 2 Na作为CF 3 S源,实现了N,N-二取代烯胺酮的α-C–H三氟甲硫基化。使用 POCl 3作为唯一的还原剂,在温和的温度(0 °C 至 rt)下进行反应。这项工作代表了通过直接 C-H 官能化合成 α-三氟甲硫基烯胺酮的第一个例子。此外,所得到的CF 3 S-官能化烯胺酮已被证明是通过简单的成环反应合成各种CF 3 S-官能化杂芳族化合物的有用结构单元。
Metal-free C(sp2)-H perfluoroalkylsulfonylation and configuration inversion: Stereoselective synthesis of α-perfluoroalkylsulfonyl E-enaminones