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.
Synthesis of Unsymmetrical <i>o</i>-Biphenols and <i>o</i>-Binaphthols via Silicon-Tethered Pd-Catalyzed C−H Arylation
作者:Chunhui Huang、Vladimir Gevorgyan
DOI:10.1021/ol100924n
日期:2010.5.21
A mild, practical, and efficient method for the synthesis of unsymmetrical o-biphenols (including o-phenol-naphthols and o-binaphthols) has been developed. Unsymmetrical bis-aryloxy silanes, which were readily prepared in a semi-one-pot fashion, underwent the Pd-catalyzed intramolecular arylation followed by a routine TBAF desilylation step to furnish valuable unsymmetrical biphenols without necessity of isolation of seven-membered intermediates. The excellent functional group tolerance allows for synthesis of a variety of functionalized o-biphenols and o-binaphthols from easily available staring materials.
Lewis Acid Mediated Electrophilic Cyanation of 2,2′-Biphenols
作者:Wu Zhang、Wen Yang、Wanxiang Zhao
DOI:10.1021/acs.joc.0c00458
日期:2020.7.2
A Lewisacidmediated electrophilic cyanation of 2,2′-biphenols with a trifluoromethanesulfonyl (Tf) protecting group is reported. The cyanation reactions with less toxic, commercially available MeSCN as a cyanating reagent afforded a range of 3-cyan-2,2′-biphenols in moderate to high yields. The use of trifluoromethanesulfonyl (Tf) as a protecting group is crucial to the success of this transformation
Dearomatization–Rearomatization Strategy for Synthesizing Carbazoles with 2,2′-Biphenols and Ammonia by Dual C(Ar)–OH Bond Cleavages
作者:Dawei Cao、Jing Yu、Huiying Zeng、Chao-Jun Li
DOI:10.1021/acs.jafc.0c00644
日期:2020.11.18
block in various pharmaceuticals, agrochemicals, natural products, and materials. For future sustainability, it is highly desirable to synthesize carbazole derivatives directly from renewable resources or cheaprawmaterials. Phenolic compounds are a class of degradation products of lignin. On the other hand, ammonia is a very cheap industrial inorganic chemical. Herein, an efficient dearomatization–rearomatization