An Aryl to Imidoyl Palladium Migration Process Involving Intramolecular C−H Activation
作者:Jian Zhao、Dawei Yue、Marino A. Campo、Richard C. Larock
DOI:10.1021/ja070657l
日期:2007.4.1
imidoyl palladium migration, followed by intramolecular arylation. The fluoren-9-one synthesis appears to involve both a palladium migration mechanism and a C-H activation process proceeding through an unprecedented organopalladium(IV) hydride intermediate. The results from deuterium labeling experiments are consistent with the proposed dual mechanism.
Copper-catalyzed ortho-acylation of phenols with aryl aldehydes and its application in one-step preparation of xanthones
作者:Jun Hu、Enoch A. Adogla、Yong Ju、Daping Fan、Qian Wang
DOI:10.1039/c2cc36176k
日期:——
In the presence of triphenylphosphine, copper(II) chloride can catalyze an intermolecular ortho-acylation reaction of phenols with aryl aldehydes. The reaction proceeds smoothly with a wide range of starting materials, and furthermore, it can be used to synthesize xanthone derivatives in a single step in high yields.
Methods are provided for forming a xanthone derivative via reacting a 2-substituted benzaldehyde with a phenol derivative to form the xanthone derivative.
提供了一种方法,通过将2-取代苯甲醛与酚衍生物反应来形成黄酮衍生物。
CBr<sub>4</sub> promoted intramolecular aerobic oxidative dehydrogenative arylation of aldehydes: application in the synthesis of xanthones and fluorenones
作者:Jing Tang、Shijun Zhao、Yuanyuan Wei、Zhengjun Quan、Congde Huo
DOI:10.1039/c7ob00080d
日期:——
promoted intramolecular aerobic oxidative dehydrogenative coupling reaction has been developed to provide a straightforward ring closure protocol for 2-aryloxybenzaldehydes to furnish xanthones. The reaction was performed under metal-, additive- and solvent-free conditions with good tolerance of functional groups. The present method is also applicable to the synthesis of fluorenones by using 2-arylbenzaldehydes
Formation and Disproportionation of Xanthenols to Xanthenes and Xanthones and Their Use in Synthesis
作者:Zeyu Shi、Si Chen、Qiong Xiao、Dali Yin
DOI:10.1021/acs.joc.0c02694
日期:2021.2.19
A facile and versatile strategy employing TiCl4-mediated cyclization followed by a Cannizzaro reaction has been developed for the synthesis of various xanthene derivatives. The reaction proceeded smoothly to afford both xanthenes/xanthones or their sulfur derivatives and tolerated a wide range of electronically diverse substrates. Using this methodology, pranoprofen was synthesized in three steps in