Aromatization of dihydronaphthalenes have been accomplished under mild conditions using an organic photocatalyst. Scope and limitations of the approach have been evaluated along with the reaction mechanism.
Copper-Catalyzed Carboarylation of Alkynes via Vinyl Cations
作者:Andrew J. Walkinshaw、Wenshu Xu、Marcos G. Suero、Matthew J. Gaunt
DOI:10.1021/ja405972h
日期:2013.8.28
Copper-catalyzed arylation of electron rich alkynes reveals stabilized trisubstituted vinylcation equivalents that react with pendant arene nucleophiles to form all carbon tetrasubstituted alkenes. The new process streamlines the synthesis of important medicinally relevant molecules.
The synthesis of 1-halonaphthalenes by the Cu-catalyzed benzannulation reaction of 2-(phenylethynyl)benzaldehyde and alkynes in the presence of the halogen reagents such as NBS, NCS, and NIS, was developed. This protocol afforded various type of 1-halonaphthalenes in moderate to excellent yields and the cross coupling reactions of 1-bromo-2-phenylnaphthalene prepared by this method with various reagents
acetaldehydes with alkynes has been established, which provides a new and versatile straightforward procedure for the regioselective synthesis of mono-, di-, and polysubstituted naphthalenes under mild conditions. Interestingly, the present catalytic system not only differentiates between internal and terminal alkynes but also shows unprecedented complete Me3SiOH elimination selectivity for silyl alkyne substrates
Rhenium-catalyzed coupling reaction of alkynes with phenylacetaldehyde dimethylacetal in the presence of H2O regioselectively afforded the corresponding 1,2-disubstituted naphthalenes. (C) 2012 Elsevier Ltd. All rights reserved.