Synthesis of coruscanones A and B, metabolites of piper coruscans, and related compounds
Russian Chemical Bulletin, ISSN: 1066-5285, Vol: 59, Issue: 1, Page: 81-90
2010
- 7Citations
- 3Captures
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Article Description
Base-catalyzed rearrangements of both individual 4-(acylmethylidene) butenolides and their mixtures prepared by condensation of citraconic anhydride with various phosphoranes occur successfully only in the presence of 5.2% MeONa in MeOH (molar ratio MeONa: substrate ≤ 10:1, room temperature, 1-2 h). Under these conditions, the yields of 2-cinnamoyl-4-methylcyclopent-4-ene-1,3-dione (coruscanone B) and 2-acetyl-4-methylcyclopent-4-ene-1,3-dione are 56 and 65%, respectively. With a considerable increase in the reaction temperature or the molar ratio MeONa: substrate, formal addition of MeOH to the C(4)=C(5) double bond of these triketones becomes an appreciable (or predominant) process. A reaction of coruscanone B with CHN in ether gives coruscanone A as a ∼3:2 mixture of (Z)-and (E)-methyl enolates (43%); other products (10%) result from the expansion and aromatization of the five-membered ring of the triketone. The simplest analog of coruscanone B, 2-acetyl-4-methylcyclopent-4-ene-1,3-dione, reacts with CHN in a similar way. © 2010 Springer Science+Business Media, Inc.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=77955896949&origin=inward; http://dx.doi.org/10.1007/s11172-010-0048-9; http://link.springer.com/10.1007/s11172-010-0048-9; http://link.springer.com/content/pdf/10.1007/s11172-010-0048-9; http://link.springer.com/content/pdf/10.1007/s11172-010-0048-9.pdf; http://link.springer.com/article/10.1007/s11172-010-0048-9/fulltext.html; http://www.springerlink.com/index/10.1007/s11172-010-0048-9; http://www.springerlink.com/index/pdf/10.1007/s11172-010-0048-9; https://dx.doi.org/10.1007/s11172-010-0048-9; https://link.springer.com/article/10.1007/s11172-010-0048-9
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