24456-79-9Relevant articles and documents
A PENTACYCLIC QUINONE AND DIOSINDIGO B FROM THE HEARTWOOD OF DIOSPYROS MELANOXYLON
Sankaram, Akella V. B.,Reddy, Vaddu V. Narayana,Sidhu, Gurbachan S.
, p. 1093 - 1096 (1981)
Diosindigo A, diosindigo B and biramentaceone have been isolated from heartwood of Diospyros melanoxylon.A violet pigment isolated from the same source has been shown to be a new pentacyclic quinone.Sunlight causes diosindigo B to change to the pentacyclic quinone and biramentaceone.The intense peaks at m/e 389 and 388 in the mass spectrum of diosindigo B are doublets which arise by fragmentation of both M+ and M+ + 2.Key Word Index- Diospyros melanoxylon; Ebenaceae; naphthaquinones; diosindigo B; rearrangement; diosindigo A; biramentaceone.
Biomimetic synthesis of the dinaphthofuranquinone violet-quinone, utilizing oxidative dimerization with the ZrO2/O2 system
Ogata, Tokutaro,Okamoto, Iwao,Kotani, Eiichi,Takeya, Tetsuya
, p. 3941 - 3948 (2007/10/03)
The first total and biomimetic synthesis of violet-quinone (1), which has a dinaphthofuranquinone (DNFQ) framework, is described. This synthesis features the oxidative dimerization of 1-naphthol 4 and the construction of the DNFQ framework by photochemica
Dimeric Naphthoquinones, IV1). - Synthesis of Biramentaceone, Mamegakinone and Rotundiquinone
Laatsch, Hartmut
, p. 1321 - 1347 (2007/10/02)
Mamegakinone (8a), biramentaceone (12a), 3,3'-bijuglone (8b), 2,2-bijuglone (12b) and their methyl ethers were prepared by oxidative coupling of substituted 4-methoxy-1-naphthols; indigoids like 24 are intermediates.Cooxidation of the isomeric dimethoxy-1