作者:Qi-Liang Yang、Yi-Kang Xing、Xiang-Yang Wang、Hong-Xing Ma、Xin-Jun Weng、Xiang Yang、Hai-Ming Guo、Tian-Sheng Mei
DOI:10.1021/jacs.9b11915
日期:2019.12.4
Synergistic use of electrochemistry and organometallic catalysis has emerged as a powerful tool for site-selective C-H functionalization, yet this type of transformation has thus far mainly been limited to arene C-H functionaliza-tion. Herein, we report the development of electrochemi-cal vinylic C-H functionalization of acrylic acids with al-kynes. In this reaction an iridium catalyst enables C-H/O-H
The closo‐dodecaborate dianion is a fundamental icosahedral boron cage with 12 identical B−H vertices. The chemistry and applications of boron clusters have inspired researchers ever since their discovery several decades ago, and the selective modification of the cage positions has remained a major synthetic challenge. A rhodium(III)‐catalyzed B−H functionalization–cyclization cascade of closo‐dodecaborate
Copper catalyzed/mediated direct B–H alkenylation/alkynylation in carboranes
作者:Yu Chen、Yik Ki Au、Yangjian Quan、Zuowei Xie
DOI:10.1007/s11426-018-9388-3
日期:2019.1
B–H functionalization has been achieved. Under the assistance of a bidentate directing group, Cu-catalyzed [4+2] annulation of carboranyl amides with internal alkynes affords unprecedented C,B-substituted carborane-fused-pyridone derivatives, whereas the use of terminal alkynes leads to B–H/C(sp)–H dehydrocoupling products. The isolation and structural identification of a notably stable Cu(I) intermediate
Electrochemically driven, Cp*Ir(III)-catalyzed regioselective annulative couplings of benzoicacids with alkynes have been established herein. The combination of iridium catalyst and electricity not only circumvents the need for stoichiometric amount of chemical oxidant, but also ensures broad reaction compatibility with a wide array of sterically and electronically diverse substrates. This electrochemical
Rh(<scp>iii</scp>)-Catalyzed three-component cascade annulation to produce the <i>N</i>-oxopropyl chain of isoquinolone derivatives
作者:Yuan He、Xian-Zhang Liao、Lin Dong、Fen-Er Chen
DOI:10.1039/d0ob02389b
日期:——
versatile functional groups at the N-substituents of isoquinolone scaffolds is still a great challenge. Herein, we report a novel three-component cascade annulation reaction to efficiently construct the N-oxopropyl chain of isoquinolone derivatives via rhodium(III)-catalyzed C–H activation/cyclization/nucleophilic attack, with oxazoles used both as the directing group and potential functionalized reagents