Tetrahedron letters

The oxidative ring expansion of spiro-annulated chroman-4-ones: Syntheses of the rotenoid core and related benzoxanthones

CD Gabbutt, JD Hepworth, BM Heron, JL Thomas

Index: Gabbutt, Christopher D.; Hepworth, John D.; Heron, B. Mark; Thomas, Jean-Luc Tetrahedron Letters, 1998 , vol. 39, # 8 p. 881 - 884

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Citation Number: 23

Abstract

ABSTRACT: Syntheses of dehydrorotenoid and benzoxanthone units from 2′- hydroxyacetophenone are described which feature a novel migration of spiro-substituted chroman-4-ones during their oxidative ring expansion. Conjugate reduction affords a trans B/C fused rotenoid and the related cis and trans fused tetrahydrobenzoxanthones.

One-step preparation of xanthones via Pd-catalyzed annulation of 1, 2-dibromoarenes and salicylaldehydes

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

[Rao, Honghua; Ma, Xinyi; Liu, Qianzi; Li, Zhongfeng; Cao, Shengli; Li, Chao-Jun Advanced Synthesis and Catalysis, 2013 , vol. 355, # 11-12 p. 2191 - 2196]

Self??assembling chiral metallo??clefts; synthesis and molecular structure of N, N′??bis (12H??benzo [α] xanthen??12??ylidene)??1, 2??ethanediamine zinc (II)??dichloride …

[Barf, Tjeerd; Jansen, Johan F. G. A.; Bolhuis, Fre van; Spek, Anthony L.; Feringa, Ben L. Recueil des Travaux Chimiques des Pays-Bas, 1993 , vol. 112, p. 376 - 383]