Metal-Free Oxidative Coupling: Xanthone Formation via Direct Annulation of 2-Aryloxybenzaldehyde using Tetrabutylammonium Bromide as a Promoter in Aqueous Medium

A metal‐free intramolecular annulation of 2‐aryloxybenzaldehydes to xanthones is disclosed, which proceeds through the direct oxidative coupling of an aldehyde CH bond and aromatic CH bonds using tetrabutylammonium bromide (TBAB) as a promoter in aqueous medium. This strategy works smoothly in the...

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Veröffentlicht in:	Advanced synthesis & catalysis 2013-08, Vol.355 (11-12), p.2191-2196
Hauptverfasser:	Rao, Honghua, Ma, Xinyi, Liu, Qianzi, Li, Zhongfeng, Cao, Shengli, Li, Chao-Jun
Format:	Artikel
Sprache:	eng
Schlagworte:	acyl radicals aldehyde CH bonds Bonding Catalysis Chemical reactions Joining metal-free conditions Organic chemistry oxidative annulation Strategy TBAB-promoted reactions Tetrabutylammonium bromide Tolerances
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