Bis-indolylquinone compounds

Details Bis-indolylquinone compounds Bis-indolylquinone compounds

2000-05-04

2003-12-09

Stockton, Laura L. (Department: 1626)

Drug, bio-affecting and body treating compositions

Designated organic active ingredient containing

Having -c-, wherein x is chalcogen, bonded directly to...

C548S455000

Reexamination Certificate

active

06660763

ABSTRACT:

1. FIELD OF THE INVENTION
The present invention relates to methods and compositions for the inhibition of cell signal transduction associated with cell proliferative disorders. In particular, the invention relates to particular indolylquinone compounds that inhibit protein tyrosine kinase/adaptor protein interactions, and methods for utilizing such compounds. The present invention also relates to methods for treating insulin-related disorders using certain indolylquinone compounds. In particular, the invention is directed to methods for activating the insulin receptor tyrosine kinase in an animal.
2. BACKGROUND OF THE INVENTION
2.1 Indolylquinones
Research interest concerning indolylquinones grew out of early observations that extracts of Chaetomium exhibited antibiotic properties. These observations led researchers to attempt the isolation of active species from cultures of these microorganisms. For example, Brewer et al. disclose the isolation of a purple pigment, which was termed cochliodinol, from isolates of
Chaetomium cochliodes
and
Chaetomium globosum
(1968, “The Production of Cochliodinol and a Related Metabolite by Chaetomium Species,”
Can. J. Microbiol.
14:861-866). Brewer et al. also disclose the synthetic conversion of cochliodinol to a diacetate compound. Id. Further, the antifungal properties of cochliodinol have also been documented (Meiler et al., 1971, “The Effect of Cochliodinol, a Metabolite of
Chaetomium cochliodes
on the Respiration of Microspores of
Fusarium oxysporum,” Can. J. Microbiol.
17: 83-86).
The structure of cochliodinol was elucidated by Jerram et al. in 1975. (1975, “The Chemistry of Cochliodinol, a Metabolite of Chaetomiium spp.,”
Can. J. Chem.
53:727-737). Jerram et al. reported the structure of cochliodinol as: 2,5-dihydroxy-3,6-di(5′-(2″-methylbut-&Dgr;A
2
″-ene)-indolyl-3′)-cyclohexadiene-1,4-dione. The conversion of cochliodinol to various other derivatives, including its dimethyl and diacetyl analogues, was also disclosed. Id. Some of these derivatives were highly colored and suitable for use as dyes, while others were colorless. Id. Sekita discloses the isolation of other bis(3-indolyl)-dihydroxybenzoquinones, including isocochliodinol and neocochliodinol from
Chaetomium niuroum
and
C. amygaalisporum
(1983, “Isocochliodinol and Neocochliodinol, Bis(indolyl)-benzoquinones from Chaetomitrm spp.,”
Chem. Pharm. Bull.
31(9): 2998-3001).
Despite the therapeutic potential of cochliodinol and its derivatives, efficient methods suitable for large scale production of these compounds have remained elusive. U.S. Pat. No. 3,917,820 to Brewer et al. discloses the purple pigment cochliodinol and a process for its production by culturing various types of Chaetomium under aerobic conditions. However, the methods of Brewer require long incubation periods for cochliodinol production (2-8 days), the use of benzene, a known carcinogen, to effect chromatographic separation of cochliodinol from the culture and are limited to the few naturally occurring compounds. Moreover, Brewer discloses the isolation of only small quantities (0.75 grams) of cochliodinol from Chaetomiuim.
Another class of indolylquinones known as the asterriquinones in which the nitrogen of the indole ring is substituted, has been shown to exhibit antitumor activity. Arai et al. proposed the general name “asterriquinones” for the class of indolylquinones based upon asterriquinone (1981, “Metabolic Products of
Aspergillus terreus
IV. Metabolites of the Strain IFO 8835. (2) The Isolation and Chemical Structure of Indolyl Benzoquinone Pigments,”
Chem. Pharm. Bull.
29(4): 961-969). It should be noted that as used herein, the term “asterriquinone” has a more general meaning, and is used interchangeably with the term “indolylquinone.” Yamamoto et al. disclose the antitumor activity of asterriquinone, i.e., 2,5-bis[N-(1″,1″-dimethyl-2″-propenyl)indol-3′-yl]-3,6-dihydroxy-1,4-benzoquinone, and its isolation from the fungus
Aspergillus terreus
(1976, “Antitumor Activity of Asterriquinone, a Metabolic Product from
Aspergillus terreus,” Gann
67:623-624).
Arai et al. disclose the isolation and characterization of 11 different kinds of bisindolyl-dimethoxyl-p-benzoquinones from
Aspergillus terreus.
Id. The isolation and structural determination of a number of other asterriquinones have also been reported. (Arai et al. 1981, “Metabolic Products of
Aspergillus terreus
VI. Metabolites of the Strain IFO 8835. (3) the Isolation and Chemical Structures of Colorless Metabolites,”
Chem. Pharm. Bull.
29(4): 1005-1012; Kaji et al., 1994, “Four New Metabolites of Aspergillus Terreus”,
Chem. Pharm. Bull.
42(8): 1682-1684). However, the separation of asterriquinones is troublesome because there are so many kinds of homologous pigments in the Aspergillis extracts. Moreover, the chromatographic purification of asterriquinones is typically carried out using benzene, a known carcinogen, as a solvent. Finally, only milligram quantities of asterriquinones have actually been isolated from these natural sources.
In view of their potential as anticancer agents, research has been directed to determination of the relationship between structure and antitumor activity of asterriquinones. For example, Arai et al. reported a study in which hydroxyl benzoquinone derivatives obtained by demethylation of bisindolyl-dimethoxyl-p-benzoquinones were found to have greater antitumor activity than the methoxyl derivatives (1981, “Metabolic Products of
Aspergilhis terreus
V. Demethylation of Asterriquinones,”
Chem. Pharm. Bull.
29(4): 991-999). Shimizu et al. noted that the presence of free hydroxyl groups in the benzoquinone moiety, as well the number and position of tert-, isopentenyl, or both pentyl groups, seems to have an effect on the antitumor activity of the compound (1982, “Antitumor Effect and Structure-Activity Relationship of Asterriquinone Analogs,”
Gann
73: 642-648). In an attempt to obtain information towards the development of more potent asterriquinone derivatives, Shimizu et al. conducted an investigation into the structure-activity relationship of asterriquinones in which the action mechanism of asterriquinone in its antitumor activity with reference to its interaction with DNA molecules and the plasma membrane of tumor cells was studied (1990, “Interaction of Asterriquinone with Deoxyribonucleic Acid in Vitro,”
Chem. Pharm. Bull.
38(9): 2617-2619). It was reported that a correlation exists between the pKa value of the asterriquinone derivative and its antitumor activity. Id. Maximum antitumor activity was observed for compounds with pKa's in the range of 6-7. Id.
Analysis of structure-activity relationships has led to attempts to obtain compounds with more potent antitumor activity by chemical modification of asterriquinone and related compounds isolated from natural sources (Shimizu et al., 1982, “Antitumor Activity of Asterriquinones from Aspergillus Fungil IV. An Attempt to Modify the Structure of Asterriquinones to Increase the Activity,”
Chem. Pharm. Bull.
30(5): 1896-1899). Although benzoquinone derivatives having aziridinyl groups in the molecule such as mitomycin C, carbazilquinone or “E 39” are well known potent anticancer agents, replacement of the functional groups at the 3 and 6 positions in the benzoquinone moiety of asterriquinone failed to enhance its antitumor potency. Id. Similarly, the introduction of an ethyleneimino group into the molecule did not increase antitumor activity. A dimethylallyl derivative of asterriquinone showed moderate activity against the ascites and solid tumors of Ehrlich carcinoma, while an allyl derivative did not. It was suggested that in order to enhance the antitumor activity, it may be necessary not only to alter the pKa value by alkylation, but also to introduce hydrophilic groups into the molecule.
In addition to their demonstrated antitumor activity, asterriquinone and some of its analogues have also been shown to be strong inhibitors of HIV-reverse transcriptase (On

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