Synthesis of Difluoromethylene-Containing 1,2,4-Oxadiazole Compounds via the Reaction of 5-(Difluoroiodomethyl)-3-phenyl-1,2,4-oxadiazole with Unsaturated Compounds Initiated by Sodium Dithionite
Copper-Catalyzed C–H Difluoroalkylations and Perfluoroalkylations of Alkenes and (Hetero)arenes
作者:Xiaoyang Wang、Shuang Zhao、Jing Liu、Dingsheng Zhu、Minjie Guo、Xiangyang Tang、Guangwei Wang
DOI:10.1021/acs.orglett.7b01712
日期:2017.8.18
A general and facile syntheticmethod for C(sp2)–H difluoroalkylations and perfluoroalkylations of alkenes and (hetero)arenes with commercially available fluoroalkyl halides has been developed with a copper-amine catalyst system. This method is characterized by high yields, mild reaction conditions, low-cost catalyst, broad substrate scope, and excellent functional group compatibility, therefore providing
Although important progress has been made in the fluoroalkylation reactions, the transition‐metal‐catalyzed carbonylative fluoroalkylation reaction remains challenging so far. Herein, we report the first example of a Pd‐catalyzedcarbonylation of difluoroalkyl bromides with (hetero)arylboronic acids under one atmosphere pressure of CO. The reaction can also be extended to the aryl potassium trifluoroborate
A kinetically controlled radical addition/elimination reaction generating fluorinated allenes was developed. This strategy offers a route to a facile synthesis of diverse trifluoromethyl, difluoromethylene, and perfluoroalkyl functionalized allenes from readily available fluoroalkyl halides and alkynyl aziridines under visible-light irradiation. Density functional theory calculation of this radical
Merging Gold/Copper Catalysis and Copper/Photoredox Catalysis: An Approach to Alkyl Oxazoles from <i>N</i>-Propargylamides
作者:Yantao Liu、Keyong Zhu、Yuting Kong、Xiao Li、Jie Cui、Yifan Xia、Jingjing Zhao、Shaofeng Duan、Pan Li
DOI:10.1021/acs.joc.1c02668
日期:2021.12.17
through merging gold/copper catalysis and copper/photoredox catalysis. Various alkyl oxazoles are synthesized from N-propargylamides with alkyl halides in good to excellent yields with wide functional-group compatibility under blue-light irradiation. Significantly, a copper catalyst plays a dual role in this transformation: as a powerful cocatalyst to accelerate protodeauration of vinyl gold intermediates
Visible-Light Photoredox-Catalyzed Formal [5 + 1] Cycloaddition of <i>N</i>-Tosyl Vinylaziridines with Difluoroalkyl Halides
作者:Yantao Liu、Wen Luo、Zhenjie Wang、Yuxin Zhao、Jingjing Zhao、Xuejun Xu、Chaojie Wang、Pan Li
DOI:10.1021/acs.orglett.0c03718
日期:2020.12.18
photoredox-catalyzed formal [5 + 1] cycloaddition of N-tosyl vinylaziridines with difluoroalkyl halides as unique C1 synthons was developed. The procedure provides an efficient and practical method to synthesize diverse pyridines in moderate to good yields. The reaction underwent a radical-initiated kinetically controlled ring-opening of vinylaziridines and involved a key α,β-unsaturated imine intermediate