Copper- and Iron-Catalyzed Decarboxylative Tri- and Difluoromethylation of α,β-Unsaturated Carboxylic Acids with CF<sub>3</sub>SO<sub>2</sub>Na and (CF<sub>2</sub>HSO<sub>2</sub>)<sub>2</sub>Zn via a Radical Process
作者:Zejiang Li、Zili Cui、Zhong-Quan Liu
DOI:10.1021/ol3034059
日期:2013.1.18
A copper-catalyzed decarboxylative trifluoromethylation of various α,β-unsaturated carboxylic acids by using a stable and inexpensive solid, sodiumtrifluoromethanesulfinate (CF3SO2Na, Langlois reagent), was developed. In addition, an iron-catalyzed difluoromethylation of aryl-substituted acrylic acids by using zinc difluoromethanesulfinate (DFMS, (CF2HSO2)2Zn, Baran reagent) via a similar radical
通过使用稳定且廉价的固体三氟甲烷亚磺酸钠(CF 3 SO 2 Na,Langlois试剂),开发了铜催化的各种α,β-不饱和羧酸的脱羧三氟甲基化反应。另外,还通过类似的自由基方法,通过使用二氟甲亚磺酸锌(DFMS,(CF 2 HSO 2)2 Zn,Baran试剂),实现了铁催化的芳基取代的丙烯酸的二氟甲基化。
Synthesis of Small Fluorescent Molecules and Evaluation of Photophysical Properties
A series of aniline-based fluorophores were newly synthesized. To increase their fluorescence quantum yields, it was particularly important to substitute 3,3,3-trifluoroprop-1-enyl (TFPE) groups next to the amino group to benefit from an extended π-electron delocalization. Among these, 5-CN-2-TFPE-aniline was found to behave as an excellent fluorophore with a reasonable fluorescence quantum yield of
Synthesis of Difluoromethylated Alkenes via Copper‐Catalyzed Protodefluorination of <i>β</i>‐(Trifluoromethyl)styrenes
作者:Tao Dong、Yibin Ye、Yanhui Wang、Kelvin Pak Shing Cheung、Gavin Chit Tsui
DOI:10.1002/asia.202300655
日期:2023.10.4
Under typical copper-catalyzed hydroboration conditions, β-(trifluoromethyl)styrenes demonstrate unusal reactivities by forming difluoromethylated alkenes via a net protodefluorination process. This is also distinct from trifluoromethyl alkenes with alkyl substituents where defluoroborylation products predominate.
Domino Hydroboration/Trifluoromethylation of Alkynes Using Fluoroform-Derived [CuCF<sub>3</sub>]
作者:Lisi He、Xinkan Yang、Gavin Chit Tsui
DOI:10.1021/acs.joc.7b00755
日期:2017.6.16
A domino hydroboration/trifluoromethylation (formal hydrotrifluoromethylation) of alkynes using the fluoroform-derived [CuCF3] reagent is achieved. Synthetically useful (E)-alkenyl-CF3 building blocks and 1,1-bis(trifluoromethyl)-substituted alkenes can be prepared under ambient conditions in one pot/one step from alkynes. The ultimate source of CF3 is the inexpensive industrial waste fluoroform.