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 oxidative carbonylation of 2-arylphenols throughC-H bond activation and C-C and C-O bond formation under acid-base free and mild conditions has been developed. The reaction tolerates a variety of substrates and provides biologically important benzopyranone derivatives in up to 87% isolated yield.
Synthesis of hydroxylated oligoarene-type phosphines by a repetitive two-step method
作者:Shunpei Ishikawa、Kei Manabe
DOI:10.1016/j.tet.2009.10.101
日期:2010.1
oligoarene-type phosphines with various substitution patterns were synthesized. Such phosphines have potential as ligands for transition metal-catalyzed reactions. A successful route, which includes a repetitive Suzuki–Miyaura coupling–triflation sequence, reduction, and salt formation, was established starting from 2-bromophenyldicyclohexylphosphine oxide. Other key aspects of the method are the use of
Palladium-Catalyzed Sequential C(<i>sp</i>
<sup>2</sup>
)-H Alkynylation/Annulation of 2-Phenylphenols with Haloalkynes Using Phenolic Hydroxyl as the Traceless Directing Group
An efficient, palladium(II)‐catalyzed, C(sp2)‐H alkynylation/annulation of 2‐phenylphenols with haloalkynes for the synthesis of substituted 6‐methylene‐6H‐dibenzo[b,d]pyrans is reported. This protocol features a traceless directing group strategy, unique regioselectivity and mild reaction conditions. Significantly, preliminary mechanistic studies suggest that the sequential C(sp2)‐H alkynylation and
Palladium-Catalyzed Alkenylation via sp<sup>2</sup> C–H Bond Activation Using Phenolic Hydroxyl as the Directing Group
作者:Chun Zhang、Jing Ji、Peipei Sun
DOI:10.1021/jo4028825
日期:2014.4.4
This note describes the efficient and highly regioselectivesynthesis of 2-(2′-alkenylphenyl)phenol derivatives via palladium-catalyzed 2′-alkenylation of 2-arylphenols directed by the phenolic hydroxyl group using benzoquinone as the oxidant in an atmosphere of air. This reaction can tolerate a series of functional groups and provides the alkenylation products regio- and stereoselectively in moderate