Ru-Catalyzed Decarboxylative Annulations of α-Keto Acids with Internal Alkynes: Dual Roles of COOH as Directing Group and Leaving Group
作者:Hui Tan、Hongji Li、Jiawang Wang、Lei Wang
DOI:10.1002/chem.201405715
日期:2015.1.26
Carboxylic acid serving as both directing and leavinggroup was discovered in Ru‐catalyzed decarboxylativeannulations of α‐keto acids with alkynes. The well‐established protocol showed high functional group tolerance, which provided an efficient and alternative route to the coumarone backbone.
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。
Cp*Co(III)-Catalyzed Annulation of Carboxylic Acids with Alkynes
作者:Rajib Mandal、Basker Sundararaju
DOI:10.1021/acs.orglett.7b00801
日期:2017.5.19
A new procedure for oxidative coupling of aromatic and acrylic acids with alkynes has been developed using abundant, nontoxic, and air stable Cp*Co(III) catalyst. The coupling involves initial cyclometalation via weak chelation-assisted C–H bond activation followed by alkyne coordination, insertion, and reductive elimination leading to diverse isocoumarins (α-pyranones) in good yields under mild conditions
Ru(<scp>ii</scp>)/PEG-400 as a highly efficient and recyclable catalytic media for annulation and olefination reactions via C–H bond activation
作者:Subhash L. Yedage、Bhalchandra M. Bhanage
DOI:10.1039/c6gc01581f
日期:——
In this report synthesis of isoquinolinones, isocoumarins, N-methyl isoquinolinones and olefination of Weinreb amides by C-H bondactivation using Ru(II)/PEG-400 as green and recyclable media is documented. This developed methodology...
Cp*Ir<sup>III</sup>-Catalyzed Oxidative Coupling of Benzoic Acids with Alkynes
作者:Daniel A. Frasco、Cassandra P. Lilly、Paul D. Boyle、Elon A. Ison
DOI:10.1021/cs400656q
日期:2013.10.4
Cp*Ir(III) complexes have been shown to catalyze the oxidative coupling of benzoic acids with alkynes in methanol at 60 °C to form a variety of isocoumarins. The use of AgOAc as an oxidant was required to facilitate significant product formation. Alkyl alkynes were shown to be more reactive substrates than aryl alkynes, and a number of functional groups were tolerated on benzoic acid. Combined mechanistic