Synthesis of 2-hydroxy-3-methylbut-3-enyl substituted coumarins and xanthones as natural products. Application of the Schenck ene reaction of singlet oxygen with ortho-prenylphenol precursors
Application of our original photooxidation-reduction methodology to prenylated dihydroxycoumarin and trihydroxyxanthone compounds led to the corresponding ortho-(2-hydroxy-3-methylbut-3-enyl)phenol derivatives with yields ranging from 8 to 65%. In most of the reported experiments, the oxidation products distribution, after the photooxygenation step, was controlled by the competition between the large group effect and the stabilising phenolic assistance effect. We also showed that ortho-(3-hydroxy-3-methylbut-1-enyl)phenol derivatives could be considered as biogenetic precursors of 2,2-dimethylbenzopyranic structures. (C) 2004 Elsevier Ltd. All rights reserved.
Crombie, Leslie; Jones, Raymond C. F.; Palmer, Christopher J., Journal of the Chemical Society. Perkin transactions I, 1987, p. 317 - 332
作者:Crombie, Leslie、Jones, Raymond C. F.、Palmer, Christopher J.
DOI:——
日期:——
Crombie et al., Journal of the Chemical Society. Perkin transactions I, vol. I, p. 1972 2248, 2253
作者:Crombie et al.
DOI:——
日期:——
Naturally Occurring Oxygen Heterocyclics. II.<sup>1</sup> Characterization of an Insecticidal Principle from Mammea americana L.<sup>2</sup>
作者:Carl Djerassi、E. J. Eisenbraun、B. Gilbert、A. J. Lemin、S. P. Marfey、M. P. Morris
DOI:10.1021/ja01547a054
日期:1958.7
Synthesis of mammeins and surangin a
作者:Leslie Crombie、Raymond C.F. Jones、Christopher J. Palmer
DOI:10.1016/s0040-4039(00)98874-9
日期:1985.1
Syntheses of natural 4-alkyl and 4-aryl coumarins with hexasubstituted aromatic rings, uncouplers of oxidative phosphorylation, are reported. MammeaB/BB, by synthesis, is the (S)-(−)-compound.
据报道,天然的4-烷基和4-芳基香豆素与六取代的芳环(氧化磷酸化的解偶联剂)的合成。合成的Mammea B / BB是(S)-(-)-化合物。