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
Oxidative Annulation of Arenecarboxylic and Acrylic Acids with Alkynes under Ambient Conditions Catalyzed by an Electron-Deficient Rhodium(III) Complex
It has been established that an electron‐deficient CpE rhodium(III) complex catalyzes the oxidative [4+2] annulation of substituted arenecarboxylic and acrylic acids with alkynes under ambient conditions (at RT–40 °C, under air) without using excess amounts of substrates to produce the corresponding substituted isocoumarins and α‐pyrones in high yields. Minor modification of reaction conditions depending
Room Temperature Decarboxylative and Oxidative [2+2+2] Annulation of Benzoic Acids with Alkynes Catalyzed by an Electron‐Deficient Rhodium(III) Complex
It has been established that an electron‐deficient (η5‐cyclopentadienyl)rhodium(III) [CpERhIII] complex is capable of catalyzing the decarboxylative and oxidative [2+2+2] annulation of benzoic acids with alkynes to produce substituted naphthalenes at room temperature. The appropriate choice of the additive and the solvent is crucial for this transformation. This catalyst system allowed use of oxygen
Oxidative [4 + 2] annulation of 1-naphthols with alkynes accelerated by an electron-deficient rhodium(<scp>iii</scp>) catalysts
作者:Antônio Junio Araujo Dias、Hiroto Takahashi、Juntaro Nogami、Yuki Nagashima、Ken Tanaka
DOI:10.1039/d1ob02181h
日期:——
The 1,3-diethoxycarbonyl-2,4,5-trimethylcyclopentadienyl (CpE) rhodium(III) complex displayed high efficacy in the catalytic oxidative annulation of 1-naphthols with internal alkynes under mild conditions. DFT calculations revealed that lower activation energies for the concerted metalation-deprotonation and the reductive elimination steps are the key to improved reactivity.
1,3-二乙氧基羰基-2,4,5-三甲基环戊二烯基(Cp E )铑( III )配合物在温和条件下对1-萘酚与内炔烃的催化氧化环化表现出高效。DFT 计算表明,协同金属化去质子化和还原消除步骤的较低活化能是提高反应性的关键。
Utilizing a copper foam electrode as the catalyst in Sonogashira C-H activation coupling reactions for the electro-oxidation synthesis of diphenylethyne derivatives
作者:Ameer H. Al-Rubaye、Salim S. Al-Rejaie、Zaman Abdalhussein Ibadi Alaridhee、Mohamed Mohany、Hawzhen Fateh M. Ameen、Nadhir N.A. Jafar、Dheyaa J. Jasim、Hasan Majdi、Abhinav Kumar、Mohammed A. Al-Anber、Majid Jabir、Ahmed Elawady