Repetitive Synthetic Method foro,o,p-Oligophenylenes Using C–H Arylation
摘要:
A synthetic method for the preparation of o,o,p-oligophenylenes has been developed. It involves Miura's C-H arylation of 2-biphenols with aryl nonaflates as the key step. Oligophenylenes with defined lengths are successfully synthesized using this method.
Biphenyl-2-ols undergo regioselectivemono- and diarylation upon a treatment with aryl iodides in the presence of a palladium catalyst in DMF using Cs2CO3 as a base to produce 1,1′ : 2′,1″-terphenyl-2-ol and 2′,6′-diphenylbiphenyl-2-ol and their derivatives. The reaction of 1-naphthol selectively occurs at its 8-position to give 8-aryl-1-naphthols. In the reaction of 2-naphthol with aryl bromides, diarylated
Palladium-Catalyzed Hydroxy Group Directed Regioselective Mono-arylation of 2-Hydroxybiphenyls to 2-Hydroxy to <i>ortho</i>
-Terphenyls
作者:Devarapalli Ravi Kumar、Alavala Gopi Krishna Reddy、Gedu Satyanarayana
DOI:10.1002/ejoc.201801637
日期:2019.4.16
Palladium‐catalyzed, hydroxygroup assisted regioselective mono‐arylation of 2‐hydroxybiphenyls to 2‐hydroxy‐ortho‐terphenyls is presented. Current methodology was amenable on a broad range of 2‐hydroxybiphenyls as well as iodoarenes, and furnished a variety of 2‐hydroxy‐ortho‐terphenyls in good to excellent yields.
Palladium-catalyzed, hydroxy-group-directed C–H arylation of [1,1′-biphenyl]-2-ols with chloroarenes was performed. The reaction showed a broad substrate scope and was successfully applied to pharmaceuticals containing a chloro group. Using 2-heteroarylphenols instead of [1,1′-biphenyl]-2-ols also yielded the desired products. The arylated product was further transformed into a triphenylene derivative