approach to compounds containing a trifluoromethylated quaternary carbon center, most of which show excellent potential to be agrochemicals. In addition, the bromides were prepared fromperfluoroisobutylene, which is a waste from industry, after several steps. This reaction shows a feasible transfer of harmful waste into useful compounds.
Preparation of 6-Difluoromethylphosphonated Phenanthridines by Visible-Light-Driven Radical Cyclization of 2-Isocyanobiphenyls
作者:Shuang Wang、Wen-Liang Jia、Lin Wang、Qiang Liu
DOI:10.1002/ejoc.201500988
日期:2015.11
A protocol to obtain a variety of 6-difluoromethylenephosphonated phenanthridines through a radicalcyclization process was explored. These reactions, performed with the use of diethyl bromodifluoromethylphosphonate as a radical resource and 2-isocyanobiphenyls as radical acceptors, were smoothly triggered by visible-light photocatalysis. Electron-withdrawing and electron-donating groups were well
Radical (Phenylsulfonyl)difluoromethylation of Isocyanides with PhSO<sub>2</sub>CF<sub>2</sub>H under Transition-Metal-Free Conditions
作者:Pan Xiao、Jian Rong、Chuanfa Ni、Junkai Guo、Xinjin Li、Dingben Chen、Jinbo Hu
DOI:10.1021/acs.orglett.6b03013
日期:2016.11.18
An atom-economical method for radical (phenylsulfonyl)difluoromethylation of isocyanides with PhSO2CF2H under transition-metal-free conditions has been developed. A PhSO2CF2 radical is generated through the oxidation of PhSO2CF2- after the deprotonation of PhSO2CF2F1 in one pot. The reaction exhibits excellent functional-group tolerance and the resulting products can be further modified with the removal of a PhSO2 group to give other CF2-containirfg compounds.
Radical Fluoroalkylation of Isocyanides with Fluorinated Sulfones by Visible-Light Photoredox Catalysis
作者:Jian Rong、Ling Deng、Ping Tan、Chuanfa Ni、Yucheng Gu、Jinbo Hu
DOI:10.1002/anie.201510533
日期:2016.2.18
visible‐light photoredox catalysis. A wide range of readily available mono‐, di‐, and trifluoromethyl heteroaryl sulfones can thus be used as efficient radical fluoroalkylation reagents under mild conditions. This method not only describes a new syntheticapplication of fluorinated sulfones, but also provides a new route to fluoroalkyl radicals.
and efficient method for the synthesis of fluorinated phenanthridin-6(5H)-ones from the corresponding 2-isocyanato-1,1′-biphenyls mediated by trifluoromethanesulfonic acid in chlorobenzene is described. The reaction uses readily available starting materials, takes place under very mild reaction conditions (r. t.) and provides access to biologically promising fluorinated heterocycles in good to excellent
描述了一种在氯苯中以三氟甲磺酸为介导的从相应的2-异氰酸基-1,1'-联苯合成氟化菲啶-6(5 H )-酮的简便有效的方法。该反应使用容易获得的起始原料,在非常温和的反应条件(rt)下进行,并以良好至优异的收率获得具有生物学前景的氟化杂环。在体外测试了合成化合物在 MDCK 细胞系中的细胞毒性以及针对流感病毒 A/Puerto Rico/8/34 (H1N1) 的抗病毒活性。