We describe an alkylative dearomatization/acid-mediated adamantane annulation sequence that allows facile access to type A polyprenylated acylphloroglucinol natural products including plukenetione A. Introduction of the 2-methyl-1-propenyl moiety was achieved via stereodivergent S(N)2 and S(N)1 cyclizations of allylic alcohol substrates.
Pathak, V. P.; Saini, T. R.; Khanna, R.N., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1984, vol. 23, # 6, p. 571 - 572
作者:Pathak, V. P.、Saini, T. R.、Khanna, R.N.
DOI:——
日期:——
Manganese(III)-Mediated Transformations of Phloroglucinols: A Formal Oxidative [4 + 2] Cycloaddition Leading to Bicyclo[2.2.2]octadiones
作者:Branko Mitasev、John A. Porco
DOI:10.1021/ol900590t
日期:2009.6.4
Manganese(III)-mediated oxidativetransformations of dearomatized phloroglucinol (1,3,5-trihydroxybenzene) derivatives are reported. A number of cyclization modes have been observed, including polycyclization to afford bicyclo[2.2.2]octadiones via a formal oxidative radical [4 + 2] cycloaddition.
Xanthones, xanthonolignoids and other constituents of the roots of vismia guaramirangae
作者:F.Delle Monache、M.Marquina Mac-Quhae、G.Delle Monache、G.B.Marini Bettolo、R.Alves De Lima
DOI:10.1016/s0031-9422(00)80095-3
日期:1983.1
Abstract A new prenylated benzophenone, vismiaphenone C, has been isolated from the root bark of Vismia guaramirangae together with the known vismiaphenone A, chrysophanic acid, γ-hydroxyferruginin A and γ-anthrone A 3 . The woody part of the roots has been shown to contain 10 xanthones, three xanthonolignoids and syringaresinol. Three of the xanthones and one of the xanthonolignoids are described