Novel Synthesis of 1,3-Disubstituted Alkyl- and Aralkylnaphthalenes from Methylenetriphenylphosphorane, 1,1-Disubstituted Epoxides, Paraformaldehyde, and Trimethylsilyl Triflate
Rhodium(<scp>i</scp>)-catalysed skeletal reorganisation of benzofused spiro[3.3]heptanes via consecutive carbon–carbon bond cleavage
作者:Takanori Matsuda、Itaru Yuihara、Kazuki Kondo
DOI:10.1039/c6ob01344a
日期:——
Skeletal reorganisation of benzofused spiro[3.3]heptanes has been achieved using rhodium(I) catalysts. The reaction of benzofused 2-(2-pyridylmethylene)spiro[3.3]heptanes proceeds via sequential C–C bond oxidative addition and β-carbon elimination. On the other hand, benzofused spiro[3.3]heptan-2-ols undergo two consecutive β-carbon elimination processes. In both cases, substituted naphthalenes are
Triflic acid catalysed regioselective synthesis of substituted naphthalenes by benzannulation of carbonyls with alkynes
作者:Vanajakshi Gudla、Mokhamatam Sudheer、Chinthu Joginarayana Rao、Paul Douglas Sanasi、Venkateswara Rao Battula
DOI:10.1016/j.tet.2021.132214
日期:2021.6
An interesting and facile triflic acid catalysed annulation of α-aryl carbonyls with arylalkynes is presented for the regioselective synthesis of substitutednaphthalenes. The annulation reaction involves a sequence of electrophilic attack of carbonyl on arylalkyne and benzannulation catalysed by triflic acid. The present catalyst effects this transformation at room temperature itself. Intramolecular
Cyclization of (2-Alkenylphenyl)carbonyl Compounds to Polycyclic Arenes Catalyzed by Copper(II) Trifluoromethanesulfonate or Trifluoromethanesulfuric Acid
作者:Wei-Min Liu、Ya Lin Tnay、Kian Ping Gan、Zhen-Hong Liu、Wan Huei Tyan、Koichi Narasaka
DOI:10.1002/hlca.201200396
日期:2012.10
Various polycyclicarenes, such as naphthalenes, tetrahydroantharacenes, tetrahydrotetracenes, dihydropentacenes, and dihydropentaphenes are prepared from 2‐alkenylphenyl ketones and aldehydes by the catalytic use of copper(II) trifluoromethanesulfonate (Cu(OTf)2) or trifluoromethanesulfuricacid (TfOH).
Gold-Catalyzed Electrophilic Addition to Arylalkynes. A Facile Method for the Regioselective Synthesis of Substituted Naphthalenes
作者:Rengarajan Balamurugan、Vanajakshi Gudla
DOI:10.1021/ol900863d
日期:2009.7.16
An interesting gold-catalyzed electrophilic addition to arylalkyne to synthesize substitutednaphthalenes has been presented. Different metal hexafluoroantimonates have also been found to effect the transformation. Counter anion and oxo- and alkynophilicities of catalytic gold species might play an important role in this annulation reaction.
Chelate-Assisted Oxidative Coupling Reaction of Arylamides and Unactivated Alkenes: Mechanistic Evidence for Vinyl C−H Bond Activation Promoted by an Electrophilic Ruthenium Hydride Catalyst
作者:Ki-Hyeok Kwon、Do W. Lee、Chae S. Yi
DOI:10.1021/om100764c
日期:2010.11.22
ruthenium-hydride complex [(eta(6)-C(6)H(6))(PCy(3))(CO)RuH](+)BF(4) (-) was found to be a highlyregioselective catalyst for the oxidative C-H coupling reaction of aryl-substituted amides and unactivated alkenes to give ortho-alkenylamide products. The kinetic and spectroscopic analyses support a mechanism involving a rapid vinyl C-H activation followed by a rate-limiting C-C bond formation steps.
阳离子钌氢化物复合物 [(eta(6)-C(6)H(6))(PCy(3))(CO)RuH](+)BF(4) (-) 被发现是一种高度区域选择性的芳基取代酰胺和未活化烯烃的氧化 CH 偶联反应生成邻烯基酰胺产物的催化剂。动力学和光谱分析支持涉及快速乙烯基 CH 活化和限速 CC 键形成步骤的机制。