Efficient Palladium-Catalyzed Cyclotrimerization of Arynes: Synthesis of Triphenylenes
摘要:
Found at the core of many discotic liquid crystals, triphenylenes can now be synthesized efficiently by the palladium-catalyzed trimerization of arynes, including those containing donor and acceptor substituents [Eq. (a); R=OMe, F].
The aryneinsertion into “S═O” bond has been validated recently. This technology is elusively applied to the synthesis of thioethers. In contrast to the reported cases, the reaction described furnished o-aryloxy triarylsulfonium salts, in lieu of thioethers, in good to excellent yields. The reaction is also featured by its exquisite regioselectivity, broad substrate scope, and mild conditions (25 °C)
作者:Rahul N. Gaykar、Avishek Guin、Subrata Bhattacharjee、Akkattu T. Biju
DOI:10.1021/acs.orglett.9b03789
日期:2019.12.6
The three-component coupling of tertiaryamines, arynes, and aryl selenium bromide or diaryl diselenide as an electrophilic selenium source allowing the synthesis of 2-selanyl aniline derivatives is reported. This aminoselenation reaction of arynes installs a C-N and C-Se bond under mild conditions, and the products are formed in moderate to good yields. This reaction is compatible with various functional
An unprecedented three-componentcouplingreaction of arynes, α-bromo carbonyl compounds, and DMSO triggered by insertion of arynes into the S═O bond of DMSO has been developed. The reaction can generate a wide range of multisubstituted aryl methyl thioethers in good yields, wherein DMSO serves as both methylthiolation reagent and oxygen source.
Thiophenols as Protic Nucleophilic Triggers in Aryne Three-Component Coupling
作者:Subrata Bhattacharjee、Avishek Guin、Rahul N. Gaykar、Akkattu T. Biju
DOI:10.1021/acs.orglett.0c03494
日期:2020.11.20
The synthetic potential of thiophenols as a protic nucleophilic trigger in the transition-metal-free and Grignard-reagent-free three-component coupling involvingarynes is demonstrated. Employing aldehydes as the third component, the reaction allowed the mild and broad scope synthesis of 2-arylthio benzyl alcohol derivatives in good yields. Moreover, selenophenol could be used as the nucleophilic trigger
Multicomponent Reactions Involving Arynes, Quinolines, and Aldehydes
作者:Anup Bhunia、Digvijay Porwal、Rajesh G. Gonnade、Akkattu T. Biju
DOI:10.1021/ol4023134
日期:2013.9.6
The multicomponentreaction involving arynes, quinolines, and aldehydes leading to the diastereoselective synthesis of benzoxazino quinoline derivatives in good yields proceeding via 1,4-zwitterionic intermediates is reported. In addition, the synthetic potential of various carbonyl compounds in this reaction as well as the utility of isoquinoline as the nucleophilic trigger has been examined.