Synthesis of Unsymmetrical o-Biphenols and o-Binaphthols via Silicon-Tethered Pd-Catalyzed C−H Arylation
摘要:
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.
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.
A resist pattern-forming method comprises applying a chemically amplified resist material on a substrate to form a resist film on the substrate. The resist film is patternwise exposed to a radioactive ray having a wavelength of no greater than 250 nm. The resist film patternwise exposed is floodwise exposed to a radioactive ray having a wavelength of greater than 250 nm. The resist film floodwise exposed is baked and developed with a developer solution comprising an organic solvent. The chemically amplified resist material comprises a component that is capable of generating a radiation-sensitive sensitizer and an acid upon an exposure. The component comprises: a radiation-sensitive sensitizer generating agent, and at least one of a radiation-sensitive acid-and-sensitizer generating agent and a radiation-sensitive acid generating agent. The radiation-sensitive sensitizer generating agent comprises a compound represented by formula (B).
US5508361A
申请人:——
公开号:US5508361A
公开(公告)日:1996-04-16
US9939729B2
申请人:——
公开号:US9939729B2
公开(公告)日:2018-04-10
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