Hydride Reduction by a Sodium Hydride-Iodide Composite
作者:Pei Chui Too、Guo Hao Chan、Ya Lin Tnay、Hajime Hirao、Shunsuke Chiba
DOI:10.1002/anie.201600305
日期:2016.3.7
Sodium hydride (NaH) is widely used as a Brønsted base in chemical synthesis and reacts with various Brønsted acids, whereas it rarely behaves as a reducing reagent through delivery of the hydride to polar π electrophiles. This study presents a series of reduction reactions of nitriles, amides, and imines as enabled by NaH in the presence of LiI or NaI. This remarkably simple protocol endows NaH with
One-pot Construction of Difluorinated Pyrrolizidine and Indolizidine Scaffolds via Copper-Catalyzed Radical Cascade Annulation
作者:Xiaoyang Wang、Miao Li、Yanyan Yang、Minjie Guo、Xiangyang Tang、Guangwei Wang
DOI:10.1002/adsc.201701643
日期:2018.6.5
A convenient approach to the synthesis of diverse difluorinated nitrogen‐containing polycycles via a copper‐catalyzed radical cascade annulation of amine‐containing olefins and ethyl bromodifluoroacetate was developed. Three new bonds, including a −CF2 and two C−N bonds, are forged simultaneously in this strategy. Through this strategy, a series of difluorinated pyrrolizidine and indolizidine derivatives
Photochemical Alkene Trifluoromethylimination Enabled by Trifluoromethylsulfonylamide as a Bifunctional Reagent
作者:Yu Zheng、Zihao Liao、Zhenzhen Xie、Hongbin Chen、Kai Chen、Haoyue Xiang、Hua Yang
DOI:10.1021/acs.orglett.3c00577
日期:2023.3.31
Herein, we disclose a facile and versatile trifluoromethylimination of alkene with a rationally designed N-(diphenylmethylene)-1,1,1-trifluoromethanesulfonamide as a bench-stable and readily accessible carboamination reagent. Enabled by an energy transfer (EnT) process, an array of alkenes were able to be facilely CF3-iminated under metal-free photocatalytic conditions. The mild reaction conditions
producing a library of functionalized trifluoromethylated δ,ϵ- or γ,δ-unsaturatedaldehydes in moderate to excellent yields with good functional group tolerance. The controllable installation of three functional groups, such as CF3, CHO, and a C−C double bond, provides a very attractive protocol for rapid synthesis of complex molecules from simple starting materials.