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。
B(C
<sub>6</sub>
F
<sub>5</sub>
)
<sub>3</sub>
‐Catalyzed Hydroarylation of Terminal Alkynes with Phenols
developed a B(C6F5)3catalyzedhydroarylation of terminalalkynes with various phenols at room temperature without adding any additives, leading to the synthesis of 2-gem-vinylphenols with good regio-selectivity. Those transformations featured a broad substrate scope with moderate yields. Mechanism studies indicated that those transformations proceeded through the activation of phenol by B(C6F5)3 with subsequent
B(C
<sub>6</sub>
F
<sub>5</sub>
)
<sub>3</sub>
‐Catalyzed Hydroarylation of Aryl Alkynes for the Synthesis of 1,1‐Diaryl and Triaryl Substituted Alkenes
作者:Hui Chen、Liuzhou Gao、Xueting Liu、Guoqiang Wang、Shuhua Li
DOI:10.1002/ejoc.202101001
日期:2021.10.7
B(C6F5)3-catalyzed hydroarylation of both terminal and internal alkynes leads to 1,1-diaryl and triaryl substituted alkenes. A B(C6F5)3-phenol adduct mediated protonation mechanism is responsible for the formation of the related alkenes as well as the observed stereoselectivity.
B(C 6 F 5 ) 3 -催化的末端和内部炔烃的加氢芳基化产生1,1-二芳基和三芳基取代的烯烃。AB(C 6 F 5 ) 3 -苯酚加合物介导的质子化机制负责相关烯烃的形成以及观察到的立体选择性。
Hydroarylation of alkynes and alkenes through alumina-sulfuric acid catalyzed regioselective C C bond formation
A highly atom-efficient synthetic protocol for hydroarylation of terminal-aryl alkynes and styrene through the regioselective CC bond formation via the electrophilic addition of naphthols and substituted phenols has been developed using alumina-sulfuric acid as a heterogeneous supported solid acid catalyst. This methodology shows excellent regioselectivity and affords the desired product in good to
3D Nanoporous FeAl-KIT-5 with a cage type pore structure: a highly efficient and stable catalyst for hydroarylation of styrene and arylacetylenes
作者:Shaji Varghese、Samuthira Nagarajan、Mercy R. Benzigar、Ajayan Mano、Zeid A. ALOthman、George Allen Gnana Raj、Ajayan Vinu
DOI:10.1016/j.tetlet.2012.01.040
日期:2012.3
A novel bimetallic nanoporous FeAl-KIT-5 catalyst with a cage type porous structure and a high surface area has been prepared for the hydroarylation of styrene and arylacetylenes to afford 1,1-diarylalkanes and 1,1-diarylalkenes, respectively. The catalyst was found to be highly active, and selective, affording a high yield of substituted alkanes and alkenes. The catalyst also showed much higher activity