TEMPO-Mediated Cross-Dehydrogenative Coupling of Indoles and Imidazo[1,2-<i>a</i>]pyridines with Fluorinated Alcohols
作者:Dhananjay S. Nipate、Sonam Jaspal、Vikki N. Shinde、Krishnan Rangan、Anil Kumar
DOI:10.1021/acs.orglett.1c00031
日期:2021.2.19
A simple and highly efficient metal-free method has been developed for hydroxyfluoroalkylation of indoles and imidazo[1,2-a]pyridines via TEMPO-mediated C(sp3)–H and C(sp2)–H bond cross-dehydrogenative coupling of fluorinated alcohols and indoles. The protocol showed broad substrate scope, afforded good yields of hydroxyfluoroalkylated products, and was amenable for scale-up. Mechanistic investigation
已经开发了一种简单高效的无金属方法,用于通过TEMPO介导的C(sp 3)–H和C(sp 2)–H键交叉脱氢偶联将吲哚和咪唑并[1,2- a ]吡啶进行羟基氟烷基化氟化醇和吲哚。该方案显示出广泛的底物范围,提供了良好的羟基氟烷基化产物收率,并且适合规模扩大。机理研究表明该自由基途径的参与。
A Free-Radical-Promoted Site-Specific Cross-Dehydrogenative-Coupling of <i>N</i>-Heterocycles with Fluorinated Alcohols
作者:Zhengbao Xu、Zhaojia Hang、Li Chai、Zhong-Quan Liu
DOI:10.1021/acs.orglett.6b02274
日期:2016.9.16
A C–C formation of an electron-rich N-heterocycle with fluorinatedalcohol is developed. Through this radical-triggered cross-dehydrogenative coupling strategy, a wide range of useful building blocks such as C3 hydroxyfluoroalkylated indoles and pyrroles can be site-specifically synthesized. Mechanistic studies indicate a single-electron-transfer initiated radical cycle would be involved.
METHODS FOR MODULATING PLANT RESPONSE TO ENVIRONMENTALLY-INDUCED STRESS
申请人:Howard University
公开号:US20150119250A1
公开(公告)日:2015-04-30
Compounds and methods are described herein that are effective to modulate plant response (e.g., plant susceptibility) to environmentally-induced stress. The compounds and methods described herein advantageously may be used to modulate environmental stress resistance in a wide variety of plants. Environmental stresses include, for example, high light intensity (UV exposure), temperature (e.g., high heat), high soil salinity, and low soil moisture (e.g., drought). As used herein, environmental stresses include any conditions that result in increased generation of reactive oxygen species (ROS) and accumulation of ROS in the plant cells. The compounds described herein that are effective to modulate resistance to the stress prevent, directly or indirectly, or increase phosphorylation of Tyr
248
of the RACK1A protein.