BeCl2 as a new highly selective reagent for dealkylation of aryl-methyl ethers
作者:Hashem Sharghi、Fatemeh Tamaddon
DOI:10.1016/0040-4020(96)00815-0
日期:1996.10
An efficient and simple method is introduced for the selective removal of methyl group from poly aryl-methyl ethers, in some important derivatives of benzophenones, xanthones, anthraquinones, aryl esters, benzamides and nitroanisoles with BeCl2.
Intermolecular C–O addition of carboxylic acids to arynes: synthesis of o-hydroxyaryl ketones, xanthones, 4-chromanones, and flavones
作者:Anton V. Dubrovskiy、Richard C. Larock
DOI:10.1016/j.tet.2013.01.078
日期:2013.4
An efficient and simple route to biologically and pharmaceutically important o-hydroxyaryl ketones, xanthones, 4-chromanones, and flavones has been developed utilizing readily available carboxylic acids and commercially available o-(trimethylsilyl)aryl triflates.
One-Pot Synthesis of Xanthones and Thioxanthones by the Tandem Coupling−Cyclization of Arynes and Salicylates
作者:Jian Zhao、Richard C. Larock
DOI:10.1021/ol0517731
日期:2005.9.1
[reaction: see text] The reaction of silylaryl triflates, CsF, and salicylates affords a general and efficient way to prepare biologically interesting xanthones and thioxanthones. This chemistry presumably proceeds by a tandem intermolecular nucleophilic coupling and subsequent intramolecular electrophilic cyclization.
Intermolecular C−O Addition of Carboxylic Acids to Arynes
作者:Anton V. Dubrovskiy、Richard C. Larock
DOI:10.1021/ol101017z
日期:2010.7.16
A novel, efficient, and expedient route to biologically and pharmaceutically important o-hydroxyaryl ketones, xanthones, 4-chromanones, and flavones has been developed starting from readily available carboxylic acids and commercially available o-(trimethylsilyl)aryl triflates.
An LDA-induced regiospecific and general conversion of diaryl ether 2-carboxamides 4 into substituted xanthones 5, including natural products, 2-hydroxy-1-methoxyxanthone (8) and 6-deoxy-jacareubin (14), is described.