78860-34-1Relevant academic research and scientific papers
Methyl scanning: Total synthesis of demethylasterriquinone B1 and derivatives for identification of sites of interaction with and isolation of its receptor(s)
Pirrung, Michael C.,Liu, Yufa,Deng, Liu,Halstead, Diana K.,Li, Zhitao,May, John F.,Wedel, Michael,Austin, Darrell A.,Webster, Nicholas J. G.
, p. 4609 - 4624 (2007/10/03)
The principle of methyl scanning is proposed for determination of the sites of interaction between biologically active small molecules and their macromolecular target(s). It involves the systematic preparation of a family of methylated derivatives of a co
Total syntheses of demethylasterriquinone B1, an orally active insulin mimetic, and demethylasterriquinone A1.
Pirrung, Michael C,Li, Zhitao,Park, Kaapjoo,Zhu, Jin
, p. 7919 - 7926 (2007/10/03)
Two total syntheses of the unsymmetrical bis-indolylquinone natural product demethylasterriquinone B1 (also known as L-783,281) have been accomplished. The first exploits a known base-promoted condensation of indoles with bromanil, which stops at monoaddition using the sterically hindered 2-isoprenylindole. This permits addition of the second indole, 7-prenylindole, which gives both meta- and para-substituted bis-indolylquinone products. This regiochemical control problem was solved by extension of a method we recently developed for acid-promoted addition of indoles to 2,5-dichlorobenzoquinone. Under our original mineral acid conditions, reaction of 2-isoprenylindole with dichlorobenzoquinone fails, but it succeeds with 3-bromo-2,5-dichlorobenzoquinone using acetic acid as the promoter. The regiochemistry established in such selectively bromine-substituted quinones can be exploited in Stille couplings. As a model system, the synthesis of demethylasterriquinone A1 was accomplished using as the key step a Stille coupling of a 2,5-dibromobenzoquinone with an (N-isoprenylindol-3-yl)tin, producing the para-substituted bis-indolylquinone exclusively. Use of a (7-prenylindole)tin in coupling with a bromo-2,5-dichloro-4-indolylbenzoquinone gives the demethylasterriquinone B1 precursor. The dihaloquinone products of these indole/quinone coupling processes can be hydrolyzed to the dihydroxyquinone natural products. Demethylasterriquinone B1 is of high recent interest as a small molecule insulin mimetic with oral anti-diabetic activity in mice.
Total synthesis of asterriquinone B1
Liu, Kun,Wood, Harold B.,Jones, A. Brian
, p. 5119 - 5122 (2007/10/03)
This communication describes the first total synthesis of asterriquinone B1, a representative member of a group of anti-tumor metabolites of Aspergillus terreus. The synthesis described herein is potentially applicable to other members of the asterriquinone family.
METABOLIC PRODUCTS OF ASPERGILLUS TERREUS. V. DEMETHYLATION OF ASTERRIQUINONES
Arai, Kunizo,Shimizu, Sakae,Taguchi, Yasuhisa,Yamamoto, Yuzuru
, p. 991 - 999 (2007/10/02)
Demethylation of asterriquinones (AQ, bisindolyl-dimethoxyl benzoquinones) was investigated in connection with the determination of their structures and studies of their antitumor activity.Usually, the demethylation proceeded smoothly with KOH, but several types of side reactions were observed with acidic reagents.Keywords-demethylation; asterriquinones; Aspergillus terreus; IFO 8835; benzoquinone; indolyl; dimethylallyl
