Manganese (III)-mediated carbon-carbon bond formation in the reaction of xanthenes with active methylene compounds

…, H Kamachi, H Baba, K Kurosawa

Index: Nishino, Hiroshi; Kamachi, Hironori; Baba, Harumi; Kurosawa, Kazu Journal of Organic Chemistry, 1992 , vol. 57, # 13 p. 3551 - 3557

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Citation Number: 44

Abstract

Oxidation of xanthenes with manganese (II1) acetate in the presence of active methylene compounds such as 1, 3-dicarbonyl compounds, malononitrile derivatives, acetone, and nitromethane selectively gives 9-substituted xanthene derivatives in good yields. A similar oxidation of thioxanthene also yields 2-(9-thioxanthenyl)-1, 3-dicarbonyl compounds in 57- 91% yields. The obtained 2-(9-xanthenyl)-l, 3-dicarbonyl compounds are readily ...