前所未有的Ru(II)催化的苯基吲唑酮与二芳基取代的炔烃和二烷基取代的炔烃的Csp 2 -H键活化和环化反应为构建全碳季中心吲哚[1,2- a ]提供了有效的途径喹唑啉酮和季碳中心的吲唑并[1,2- a ]吲唑酮。吲哚[1,2- a ]喹唑啉酮是通过Csp 2 -H活化,炔烃插入和1,2-苯基移位而形成的。吲唑[1,2一]是通过一个级联反应形成indazolones经由含有吲哚并形成环外双键[1,2一]喹唑啉酮。
The amide C–N bond of isatins as the directing group and the internal oxidant in Ru-catalyzed C–H activation and annulation reactions: access to 8-amido isocoumarins
作者:Partha Pratim Kaishap、Bipul Sarma、Sanjib Gogoi
DOI:10.1039/c6cc04461a
日期:——
The amide C–N bond of isatins was used as the oxidizing directing group for 4C–H activation and annulation reactions with alkynes.
吲哚酮的酰胺C-N键被用作氧化定向基团,用于与炔烃进行4C-H活化和环化反应。
Ruthenium(II)-Catalyzed Synthesis of Spirobenzofuranones by a Decarbonylative Annulation Reaction
作者:Partha P. Kaishap、Gauri Duarah、Bipul Sarma、Dipak Chetia、Sanjib Gogoi
DOI:10.1002/anie.201710049
日期:2018.1.8
activation of six‐membered compounds is reported. The Ru‐catalyzed reaction of 3‐hydroxy‐2‐phenyl‐chromones with alkynes works most efficiently in the presence of the ligand PPh3 to provide spiro‐indenebenzofuranones. Unlike previously reported metal‐catalyzed decarbonylative annulation reactions, in the present decarbonylative annulation reaction, the annulation occurs before extrusion of carbon monoxide
据报道,炔烃通过六元化合物的C / H / C-C活化而首次脱羰基插入。在配体PPh 3存在下,Ru-催化的3-羟基-2-苯基色酮与炔烃的反应最有效,可提供螺茚二苯并呋喃酮。与以前报道的金属催化的脱羰环化反应不同,在本脱羰环化反应中,环化发生在一氧化碳挤出之前。
Ruthenium(II)‐Catalyzed Dearomatized C−H Activation and Annulation Reaction of Vinylnaphthols with Alkynes: Access to Spiro‐Pentacyclic Naphthalenones
作者:Gauri Duarah、Partha P. Kaishap、Bipul Sarma、Sanjib Gogoi
DOI:10.1002/chem.201801537
日期:2018.7.17
The ruthenium(II)‐catalyzed annulation of vinylnaphthols and alkynes is described. The reaction proceeds through C−H activation, dearomatization, and alkyne insertion. This reaction affords spiro‐pentacyclic naphthalenones that have biological significance in good yields.
描述了钌 (II) 催化的乙烯基萘酚和炔烃的环化反应。反应通过 C-H 活化、脱芳构化和炔烃插入进行。该反应以良好的收率提供具有生物学意义的螺五环萘酮。
Si-Gly-CD-PdNPs as a hybrid heterogeneous catalyst for environmentally friendly continuous flow Sonogashira cross-coupling
for the Sonogashira cross-coupling exploiting the safe use of a CPME/water azeotropic mixture and the utilization of a heterogeneous hybrid palladium catalyst supported onto a silica/β-cyclodextrin matrix in continuousflow. The use of the aq CPME azeotrope has proven to be crucial to enhance the catalyst performance including very low metal leaching. In addition, we have also completed the flow protocol
Ru(<scp>ii</scp>)-Catalyzed annulation of benzamidines and alkynes by C–H/N–H activation: a facile synthesis of 1-aminoisoquinolines
作者:P. P. Kaishap、G. Duarah、D. Chetia、S. Gogoi
DOI:10.1039/c7ob00389g
日期:——
An inexpensive Ru(II) complex catalyzes the oxidative annulation reaction of disubstituted alkynes with benzamidines to provide highly valuable 1-aminoisoquinolines in high yields. The reaction also features excellent regioselectivity with some unsymmetrical alkynes.