2,2'‐Biphenols are a large and diverse group of compounds with exceptional properties both as ligands and bioactive agents. Traditional methods for their synthesis by oxidative dimerisation are often problematic and lead to mixtures of ortho‐ and para‐connected regioisomers. To compound these issues, an intermolecular dimerisation strategy is often inappropriate for the synthesis of heterodimers. The
The Acetal Concept: Regioselective Access to<i>ortho</i>,<i>ortho</i>-Diphenols via Dibenzo-1,3-dioxepines
作者:Kye-Simeon Masters、Stefan Bräse
DOI:10.1002/anie.201207485
日期:2013.1.14
motif found in many polyphenolic natural products, as well as synthetically useful compounds such as the chiral ligands binol, vapol, and vanol. The new route consists of a radical‐based reaction of an acetal‐tethered biphenyl ether substrate and subsequent hydrolytic cleavage of the dibenzo‐1,3‐dioxepine intermediate.
TBDPS and Br-TBDPS Protecting Groups as Efficient Aryl Group Donors in Pd-Catalyzed Arylation of Phenols and Anilines
作者:Chunhui Huang、Vladimir Gevorgyan
DOI:10.1021/ja904791y
日期:2009.8.12
as an efficient phenyl group donor for o-bromophenols via Pd-catalyzed C-Harylation followed by a routine TBAF deprotection of the resulting silacycles. Employment of the newly designed Br-TBDPS protecting group in the same sequence allows for a facile introduction of a phenyl group at the ortho position of phenols and anilines. Alternatively, switching desilylation to oxidation in the last step allows
Synthesis of 2,2′-biphenols through direct C(sp<sup>2</sup>)–H hydroxylation of [1,1′-biphenyl]-2-ols
作者:Shitao Duan、Yuanshuang Xu、Xinying Zhang、Xuesen Fan
DOI:10.1039/c6cc04756d
日期:——
A novel synthesis of diversely substituted 2,2′-biphenols through Pd(ii)-catalyzed,tBuOOH-oxidized, and hydroxyl-directed C(sp2)–H hydroxylation of [1,1′-biphenyl]-2-ols has been developed.