Ruthenium(<scp>ii</scp>)-catalyzed electrooxidative [4+2] annulation of benzylic alcohols with internal alkynes: entry to isocoumarins
作者:Mu-Jia Luo、Ming Hu、Ren-Jie Song、De-Liang He、Jin-Heng Li
DOI:10.1039/c8cc08759h
日期:——
A new ruthenium(II)-catalyzed electrooxidative [4+2] annulation of primarybenzylicalcohols with internal alkynes is described, which enables benzylicalcohols as weakly directing group precursors to access isocoumarins via multiple C–H functionalization. The reaction works well with a broad substrate scope, tolerates a wide range of functional groups, and incorporates practically the isocoumarin
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
Cobalt(III)-Catalyzed Oxidative Annulation of Benzaldehydes with Internal Alkynes via C–H Functionalization in Poly(ethylene glycol)
作者:Li-Ming Tao、Chuan-Hua Li、Jun Chen、Hui Liu
DOI:10.1021/acs.joc.9b00580
日期:2019.6.7
novel Co(III)-catalyzed oxidative annulation of aromatic aldehydes with internal alkynes for accessing isocoumarins is described, which is achieved by oxidation, weak chelation-assisted C–H bond functionalization, and annulation cascades with excellent functional group compatibility, high atom economy, and step efficiency. By using environmentally benign and inexpensive poly(ethyleneglycol)-400 (PEG-400)
描述了一种新型的Co(III)催化的带有内部炔烃的芳香醛与内部炔烃的氧化环化反应,可用于获得异香豆素,该反应是通过氧化,弱螯合辅助的C–H键官能化以及具有出色官能团相容性的环化级联反应实现的,具有高原子经济性,并提高效率。通过使用对环境无害且廉价的聚(乙二醇)-400(PEG-400),可以回收和再利用Co / Cu / PEG-400系统。
Ruthenium-catalyzed C–H/O–H and C–H/N–H bond functionalizations: oxidative annulations of cyclopropyl-substituted alkynes
作者:Monica Deponti、Sergei I. Kozhushkov、Dmitry S. Yufit、Lutz Ackermann
DOI:10.1039/c2ob26250a
日期:——
The chemical behavior of cyclopropyl-substituted alkynes has been probed using the reaction conditions of ruthenium-catalyzed oxidative CâH/OâH and CâH/NâH bond functionalizations. The oxidative annulations proceeded with complete conservation of all cyclopropane fragments and allowed for the one-step preparation of synthetically useful cyclopropyl-substituted isocoumarins and isoquinolones with high regioselectivities and chemical yields. The connectivities of the key heterocyclic products were unambiguously established by X-ray diffraction analysis.
使用钌催化的氧化 C–H/O–H 和 C–H/N–H 键功能化反应条件,对环丙基取代的炔烃的化学行为进行了探讨。氧化环化反应在完全保留所有环丙烷片段的情况下进行,并允许一步法合成具有高区域选择性和化学产率的合成有用的环丙基取代异香豆酸和异喹啉。关键杂环产物的连接方式通过 X 射线衍射分析得到了明确的确定。
Decarboxylative [4+2] annulation of arylglyoxylic acids with internal alkynes using the anodic ruthenium catalysis
作者:Mu-Jia Luo、Ting-Ting Zhang、Fang-Jun Cai、Jin-Heng Li、De-Liang He
DOI:10.1039/c9cc03210j
日期:——
A new electrochemical decarboxylative [4+2] annulation of arylglyoxylic acids with internal alkynes involving C–H functionalization by means of a cooperative anode and ruthenium catalysis is presented. This reaction represents a mechanistically novel strategy as an ideal supplement to the decarboxylative [4+2] annulation methodology by employing an electrooxidative process to avoid the use of an additional
提出了一种新的芳基乙醛酸与内部炔烃的电化学脱羧[4 + 2]环合反应,涉及通过协同阳极和钌催化的C–H官能化。通过采用电氧化工艺避免使用额外的外部氧化剂并利用H 2 O作为要结合的羧基氧原子源,该反应代表了一种机械新颖的策略,是脱羧[4 + 2]环化方法的理想补充在合成1 H -isochromen-1-ones中。