Pericyclic Reactions of Prenylated Naphthoquinones: Biomimetic Syntheses of Mollugin and Microphyllaquinone
摘要:
[GRAPHICS]A total synthesis of the bioactive naphthohydroquinone mollugin and the related naphthoquinone dimer microphyllaquinone is described. Both syntheses exploit the propensity of prenylated quinones to undergo tautomerization/oxa 6 pi electrocyclizations.
Biosynthesis of anthraquinones and related compounds in Galium mollugo cell suspension cultures
作者:Kenichiro Inoue、Yoshinori Shiobara、Hidekazu Nayeshiro、Hiroyuki Inouye、Graham Wilson、Meinhart H. Zenk
DOI:10.1016/s0031-9422(00)80323-4
日期:1984.1
Abstract From Galiummollugocell suspension cultures, 1,4-dihydroxy-3-prenyl-2-naphtholic acid methyl ester diglucoside was isolated along with anthraquinones and mollugin. Production of the diglucoside was much increased by administering 2-succinylbenzoate to the cultures. The incorporation of 2-succinylbenzoate into lucidin-3-primeveroside, mollugin and the diglucoside in the mode so far proposed
作者:Norbert De Kimpe、Pascal Habonimana、Sven Claessens
DOI:10.1055/s-2006-950441
日期:2006.9
Two different strategies are presented to synthesize mollugin, based upon a close investigation of possible natural precursors. The best total synthesis of mollugin, a natural product isolated from rubiaceous herbs, is achieved in an overall yield of 61% starting from 1,4-dihydroxynaphthalene-2-carboxylic acid. The key reaction is the prenylation and spontaneous pyran ring formation. Subsequent oxidation of the intermediate 3,4-dihydromollugin with DDQ afforded mollugin.
Synthesis of naturally occurring naphthoquinone epoxides and application in the synthesis of β-lapachone
作者:Sven Claessens、Pascal Habonimana、Norbert De Kimpe
DOI:10.1039/c004580b
日期:——
epoxidation protocol making use of H2O2/Na2CO3, naphthoquinone epoxides are obtained in high yields. The optimized epoxidation conditions are applied in a short and high yielding synthesis of the pharmaceutically important β-lapachone.
提出了单烷基化和二烷基化萘醌的优化环氧化条件。基于利用H 2 O 2 /Na 2 CO 3的环氧化方案,以高收率获得萘醌环氧化物。优化的环氧化条件适用于药学上重要的短而高产的合成β-拉帕酮.
Synthesis of the Natural Products 3-Hydroxymollugin and 3-Methoxymollugin
作者:Mudiganti Naga Venkata Sastry、Sven Claessens、Pascal Habonimana、Norbert De Kimpe
DOI:10.1021/jo100024b
日期:2010.4.2
available 3-bromomollugin 6. Surprisingly, it was found that the reaction of 3-bromomollugin 6 with sodiummethoxide in methanol resulted in the formation of 3-methoxymollugin 3 and the ring-contracted methyl isopropenylfuromollugin 7. A mechanism for this ring contraction is proposed on the basis of a pericyclic retro oxa-6π ring-openingreaction. A second synthesis of 3-hydroxymollugin 2 was based on epoxidation