Acid-Catalyzed Synthesis of α,β-Disubstituted Conjugated Enones by a Meyer-Schuster-Type Rearrangement in Allenols
作者:Benito Alcaide、Pedro Almendros、Sara Cembellín、Teresa Martínez del Campo
DOI:10.1002/adsc.201400928
日期:2015.3.23
A novel, direct and simple methodology to gain access to α,β‐disubstituted conjugated enones from α‐allenols in a sustainable metal catalysis context, considering the inexpensiveness and environmentally friendliness of iron(III) species and protons, has been developed.
Rearrangement of 2-Aryloxybenzaldehydes to 2-Hydroxybenzophenones by Rhodium-Catalyzed Cleavage of Aryloxy CO Bonds
作者:Honghua Rao、Chao-Jun Li
DOI:10.1002/anie.201103599
日期:2011.9.12
Lost in the shuffle: An unprecedented rearrangement of the title compounds proceeds by the simultaneous rhodium‐catalyzed cleavage of aryloxy CO and aldehyde CH bonds (see scheme). The reaction tolerates the presence of various catalytically reactive substituents such as aryl halides, nitrile, and esters.
Metal-Free Oxidative Coupling: Xanthone Formation<i>via</i>Direct Annulation of 2-Aryloxybenzaldehyde using Tetrabutylammonium Bromide as a Promoter in Aqueous Medium
作者:Honghua Rao、Xinyi Ma、Qianzi Liu、Zhongfeng Li、Shengli Cao、Chao-Jun Li
DOI:10.1002/adsc.201300488
日期:2013.8.12
AbstractA metal‐free intramolecular annulation of 2‐aryloxybenzaldehydes to xanthones is disclosed, which proceeds through the direct oxidative coupling of an aldehyde CH bond and aromatic CH bonds using tetrabutylammonium bromide (TBAB) as a promoter in aqueous medium. This strategy works smoothly in the presence of both electron‐donating and electron‐withdrawing groups, and displays good tolerance towards catalytically reactive substituents, thus promising further functionalizations of xanthone products.magnified image
Rhodium-Catalyzed Xanthone Formation from 2-Aryloxybenzaldehydes via Cross-Dehydrogenative Coupling (CDC)
作者:Ping Wang、Honghua Rao、Ruimao Hua、Chao-Jun Li
DOI:10.1021/ol203381q
日期:2012.2.3
A concise and straightforward strategy to construct a xanthone skeleton via an intramolecular cross-dehydrogenative coupling (CDC) of 2-aryloxybenzaldehydes has been developed. The reaction proceeded smoothly without any need of preactivation of the aldehyde group. It can tolerate various functional groups and provides an applicable protocol to construct a wide range of xanthone derivatives.
[EN] PHOTOSENSITIVE RESIN COMPOSITION, CURED FILM, LAMINATE, METHOD FOR PRODUCING CURED FILM, AND SEMICONDUCTOR DEVICE<br/>[FR] COMPOSITION DE RÉSINE PHOTOSENSIBLE, FILM DURCI, STRATIFIÉ, PROCÉDÉ DE PRODUCTION DE FILM DURCI, ET DISPOSITIF À SEMI-CONDUCTEUR<br/>[JA] 感光性樹脂組成物、硬化膜、積層体、硬化膜の製造方法、および半導体デバイス