Ruthenium-Catalyzed Aromatization of Enediynes via Highly Regioselective Nucleophilic Additions on a π-Alkyne Functionality. A Useful Method for the Synthesis of Functionalized Benzene Derivatives
作者:Arjan Odedra、Chang-Jung Wu、Taduri Bhanu Pratap、Chun-Wei Huang、Ying-Fen Ran、Rai-Shung Liu
DOI:10.1021/ja043047j
日期:2005.3.1
TpRu(PPh3)(CH3CN)2 PF6 (10 mol %) catalyst effected the nucleophilicaddition of water, alcohols, aniline, acetylacetone, pyrroles, and dimethyl malonate to unfunctionalized enediynes under suitable conditions (100 degrees C, 12-24 h) and gave functionalized benzene products in good yields. In this novel cyclization, nucleophiles very regioselectively attack the internal C1' alkyne carbon of enediynes
Experimental and Computational Evidence for Gold Vinylidenes: Generation from Terminal Alkynes via a Bifurcation Pathway and Facile C–H Insertions
作者:Longwu Ye、Yanzhao Wang、Donald H. Aue、Liming Zhang
DOI:10.1021/ja2091992
日期:2012.1.11
species is highly reactive and undergoes facile intramolecular C(sp(3))-H insertions as well as O-H and N-H insertions. The formation step for the gold vinylidene is predicted theoretically to be complex with a bifurcated reaction pathway. A pyridine N-oxide acts as a weak base to facilitate the formation of an alkynylgold intermediate, and the bulky BrettPhos ligand in the gold catalyst likely plays a
The SmI<sub>2</sub>/TEU<sup>–</sup>-Mediated Cyclization of Unsaturated Halides
作者:Chriss E. McDonald、Holly D. Bendorf、Joseph R. Mauck、Christopher C. McAtee、Ahren I. Green、David J. Ciccarelli、Cassandra A. Bendyk、Brandon J. Conrad、Angelique T. Delgado
DOI:10.1021/acs.orglett.0c02074
日期:2020.7.17
The combination of SmI2 and the conjugate base of triethylurea (TEU–) has been shown to favor the cyclization of unsaturated halides over direct reduction to a much greater extent than other SmI2-based reductants. Aryl, heteroaryl, and alkyl halides (X = Br, Cl, F) readily undergo heterocyclization and carbocyclization in the presence of SmI2/TEU–.
SMI的组合2和triethylurea的共轭碱(TEU - )已被证明有利于不饱和卤化物超过直接还原到更大的程度比其他SMI环化2系还原剂。在SmI 2 / TEU –的存在下,芳基,杂芳基和卤代烷(X = Br,Cl,F)容易发生杂环化和碳环化。
Platinum-Catalyzed Aromatization of Enediynes via a C−H Bond Insertion of Tethered Alkanes
作者:Bhanu Pratap Taduri、Ying-Fen Ran、Chun-Wei Huang、Rai-Shung Liu
DOI:10.1021/ol052962m
日期:2006.3.2
PtCl2 (5 mol%) is an effective catalyst for aromatization of enediynes via a C-H bondinsertion of tethered alkanes. The reaction mechanism of this cyclization is proposed to involve platinum-pi-alkyne intermediates. This cyclization works not only for terminal alkynes but also for internal alkynes.