1991-29-3Relevant academic research and scientific papers
Dimeric Naphthoquinones, 17. Synthesis of Stypandrone and Dianellinone
Laatsch, Hartmut
, p. 377 - 385 (2007/10/02)
The naphthoquinone stypandrone (2b) ist synthesized via the intermediates 5a, 6a and 6b.Selective monoalkylation of its hydroquinone yields the monoether 12b, which, on phenol oxidation and oxidative dealkylation, leads to 13 and dianellinone (2a).The synthesis confirms the 3,3'-dimerisation of the natural product. - Keywords: Naphthoquinones, Stypandrone, Dianellinone, Phenol Oxidation
Regioselective Syntheses of 3,3'-Bijuglone, Mamegakinone, Dianellinone, cyclo-Trijuglone, Xylospyrin, and Trianellinone by Phenol-Quinone Addition
Brockmann, Hans,Laatsch, Hartmut
, p. 433 - 447 (2007/10/02)
Regioselective phenol-quinone addition of juglone (1a), 7-methyljuglone (1b), and stypandrone (1c) in pyridine yields the dimers 3,3-bijuglone (5a), mamegakinone (5c), and dianellinone (5e).In acetic acid mainly the cyclo trimers cyclo-trijuglone (12a), xylospyrin (12d), and trianellinone (12g) are obtained.
