# Patent

## Title
Halocombstatins and methods of synthesis thereof

## Abstract

The invention relates to novel compounds denominated halocombstatins. The halocombstatins are derivatives of combretastatin A-3, and include compounds that exhibit cancer growth cell inhibition against a panel of human cancer cell lines and the murine P388 leukemia, as well as activity as inhibitors of tubulin polymerization and inhibitors of the binding of colchicine to tubulin.

## Background
RELATED APPLICATION DATA
This application is based on and claims the benefit of U.S. Provisional Patent Application No. 60/505,935 filed on Sep. 24, 2003, the disclosure of which is incorporated herein in its entirety by this reference.


Financial assistance for this invention was provided by the United States Government, Division of Cancer Treatment and Diagnosis, National Cancer Institute, Department of Health and Human Services Outstanding Investigator Grant Numbers CA44344-05-12; R01-CA90441-01; and R01 CA090441-03-041; the Arizona Disease Control Research Commission contract Number 9815; and private contributions. Thus, the United States Government has certain rights in this invention.


FIELD OF THE INVENTION
This invention relates to novel compounds having utility in the treatment of cancer and/or as antimicrobials.
BACKGROUND OF THE INVENTION
Pharmaceutical agents to treat cancer and/or tumors are widely sought. Antiangiogenesis agents are being pursued as a promising antitumor therapeutic agents. Combretastatin A-4 is one such antiangiogenesis agent. Studies have demonstrated that combretastatin A-4 disrupts the microtubules of human umbilical vein endothelial cells (HUVEC) in culture. It has also been shown that the tubulin-binding properties shown in cell-free systems are retained when the compound enters cells, and that tubulin binding is a significant component of biological acitivity.
The African Bush Willow Combretum caffrum has proved to be a very important source of cancer cell growth inhibitory constituents named combretastatins. The most potent of these constituents is combretastatin A-4 (1a, “CA-4”), and its sodium phosphate derivative (1b, “CA-4P”) was advanced to Phase I human cancer clinical trials in 1998. (Remick, S. C., et al., (1999) Phase I Pharmacokinetics Study of Single Dose Intravenous (IV) Combretastatin A-4 Prodrug (CA4P) in Patients (pts) with Advanced Cancer, Molecular Targets and Cancer Therapeutics Discovery Discovery, Development, and Clinical Validation, Proceedings of the AACR-NCI-EORTC International Congress, Washington, D.C., #16, p. 4.) Overall results continue to be promising, and human cancer Phase II and combination Ib trials are currently underway.
Antivascular, antiangiogenesis and general antimetastatic activities of CA4P as well as its synergistic utility in combination with other anticancer drugs, radioimmunotherapy and hyperthermia are all areas of active research interest. (see Griggs, J., et al., Combretastatin A-4 Disrupts Neovascular Development in Non-Neoplastic Tissue, British J. of Cancer 2001, 84, 832–835; Folkman, J., Angiogenesis-Dependent Diseases, Seminars in Oncology 2001, 28, 536–542; Kruger, E. A. et al., Approaches to Preclinical Screening of Antiangiogenic Agents, Seminars in Oncology 2001, 28, 570–576; Jin, X., et al., Evaluation of Endostatin Antiangiogenesis Gene Therapy in vitro and in vivo, Cancer Gene Therapy 2001, 8, 982–989; Vacca, A., et al., Bone Marrow Angiogenesis in Patients with Active Multiple Myeloma, Seminars in Oncology 2001, 28, 543–550; Rajkumar, S. V., et al., Angiogenesis in Multiple Myeloma, Seminars in Oncology 2001, 28, 560–564; Griggs, J., et al., Potent Anti-metastatic Activity of Combretastatin A-4, Int. J. Oncol. 2001, 821–825; Pedley, R. B. et al., Eradication of Colorectal Xenografts by Combined Radioimmunotherapy and Combretastatin A-4 3-O-Phosphate, Cancer Research 2001, 61, 4716–4722; Eikesdal, H. P., et al., Tumor Vasculature is Targeted by the Combination of Combretastatin A-4 and Hyperthermia, Radiotherapy and Oncology 2001, 61, 313–320.)
Several of the compounds of the present invention are particularly concerned with treatment of thyroid gland cancer. By 2002, some 20,000 people in the United States were diagnosed with carcinoma of the thyroid gland; of these the distribution was about 80% papillary and 14% follicular differentiated carcinomas derived from follicular epithelial cells producing thyroid hormone. Of the remaining thyroid malignancies, about 4% were medullary carcinoma (neuroendocrine) and 2% of the exceptionally aggressive anaplastic carcinoma (median survival 4–5 months and a near 100% lethal outcome). Significantly, the incidence of both follicular and anaplastic carcinomas are elevated in geographic areas of iodine deficiency. Radiation exposure represents the most general risk factor for thyroid cancer. In addition, excess production of the pituitary hormone thyroid-stimulating hormone (THS), which is very important in regulating thyroid gland growth and function, may be important in the etiology of thyroid cancer. Previously used clinical treatments for thyroid cancer include surgery, suppression of THS, 131-radiotherapy, and anticancer drugs. But in 2002, another 1,300 victims of thyroid cancer in the U.S. died, emphasizing the great need for more routinely effective anticancer drugs.
SUMMARY OF THE INVENTION
The present invention relates to novel compounds constituting modifications of combretastatin A-3 (3a) and its phosphate prodrug (3b), wherein the 3-hydroxy group or the 3-hydroxy and 5-hydroxy groups are replaced with a halide. Representative halides are fluorine, chlorine, bromine and iodine. Salts of the novel compounds are also disclosed herein. Also described herein are phosphate ester derivatives of the 3-fluoro, 3-chloro, 3-bromo and 3-iodo-stilbenes.
Compounds of the invention comprise:




Wherein X is F, Cl, Br or I




Wherein X is F, Cl, Br or I, and R is a metal cation such as Na, Li, K, Cs, Rb, Ca, Mg or is morpholine, piperidine, glycine-OCH3, tryptophan-OCH3 or NH(CH2OH)3.




Wherein X is F, Cl, Br or I, and Z is a metal cation such as Na, Li, K, Cs, Rb, Ca, Mg or is morpholine, piperidine, glycine-OCH3, tryptophan-OCH3 or NH(CH2OH)3.
Several of the compounds of the invention exhibit greatly enhanced (>10–100×) cancer cell growth inhibition, as compared to prior art combretastatin compounds such as CA-4 and CA-3, against a panel of human cancer cell lines and the murine P388 leukemia. The iodo compounds appear to show particular promise in the treatment of thyroid cancers. The compounds of the present invention exhibit inhibiting of tubulin polymerization and binding of colchicine to tubulin. In addition, several of the compounds exhibit antimicrobial properties.



DESCRIPTION OF THE DRAWINGS
FIG. 1 shows the structural formulas of several prior art compounds.
FIG. 2 shows the reaction scheme for synthesizing some of the compounds of the present invention, including structural formulas for the compounds of the invention.
FIG. 3 shows a continuation of the reaction scheme of FIG. 2.
FIG. 4 shows the reaction scheme for synthesizing some of the compounds of the present invention, including structural formulas for the compounds of the invention.
FIG. 5 shows photographs of results of the cord formation assay.



DETAILED DESCRIPTION OF THE INVENTION
The concept of antiangiogenesis as a therapeutic approach for the treatment of cancer, particularly tumors, is being actively pursued as a promising strategy. The compound combretastatin A-4 has previously been demonstrated to disrupt the microtubules of human umbilical vein endothelial cells (HUVEC) in culture. Those studies confirmed that the tubulin-binding properties shown in cell-free systems are retained when the compound enters cells, and that tubulin binding is a significant component of the biological activity.
Thus, an object of the present invention is to provide new compounds that may be useful as tubulin binding agents.
A further object of the invention is to provide compounds that possess antiangiogenesis properties.
Yet another object of the invention is to provide compounds for use as therapeutic agents for the treatment of mammals, including humans, afflicted with cancer, particularly tumors.
Still a further object of the invention is to provide compounds for use as antimicrobials.
Results and Discussion
Preparation of the stilbenes of the present invention was accomplished as described in detail herein. The reaction sequence was initiated by protection of isovanillin as the tert-butyldiphenylsilyl ether 4. Benzaldehyde 4 was reduced using sodium borohydride to benzyl alcohol 5, followed by conversion to phosphonium bromide 6. Condensation of Wittig intermediate 6 with the respective halo-aldehyde using n-butyllithium in THF led to silyl group protected stilbenes 7–10. Subsequent deprotection (Scheme 2) with tetrabutylammonium fluoride afforded 3-halo-stilbenes 11–14. The Z isomers 11a, 13a and 14a were phosphorylated using dibenzylphosphite, diisopropylethyl-amine, N,N-dimethylamino-pyridine and carbon tetrachloride in acetonitrile to provide bisbenzyl phosphates 15–17. Debenzylation of phosphate esters 15–17 was achieved using trimethylsilybromide followed by the corresponding base to produce phosphates 18–20. (See Pettit, G. R., et al., Antineoplastic Agents 440. Asymmetric Synthesis and Evaluation of the Combretastatin A-1 SAR Probes (1S,2S) and (1R,2R)-1-2-Dihydroxy-1-(2′,3′-dihydroxy-4′-methoxyphenyl)-2-(3′′,4′′,5′′-trimethoxyphenyl)-ethane, J. Nat. Prod. 2000, 63, 969–974; Pettit, G. R., et al., Antineoplastic Agents 460. Synthesis of Combretastatin A-2 Prodrugs, Anticancer Drug Design 2001, 16, 185–194; Pettit, G. R., et al. Antineoplastic Agents 463. Synthesis of Combretastatin A-3 Diphosphates, Anticancer Drug Design 2000, 15, 397–404.; Ladd, D. L., et al.; A New Synthesis of 3-Fluoroveratrole and Z-Fluoro-3,4 Dimethoxy Benzaldahyde, Synth. Commun. 1985, 15, 61.)
Compared to the related combretastatins, the new halo-stilbenes or halocombstatins shown in Table I as compounds 11a through 20a, all exhibited very strong inhibition of cancer cell growth. The three stilbenes (11a, 13a, 14a) converted to phosphate salts all retained strong activity and demonstrated markedly better aqueous solubility than their 3-halo-stilbene precursors. The E geometrical isomers evaluated appeared in vitro to be much less effective as inhibitors of cancer cell growth.
Because of their potent cytotoxicity, the four halocombstatins (11a, 12a, 13a, and 14a) were compared to combretastain A-4 (1a) for inhibitory effects on tubulin polymerization and on the binding of [3H]colchicine to tubulin. The results of this comparison are shown in Table II. These experiments demonstrate that the five compounds are essentially identical in their apparent interactions with tubulin. The four halocombretastatins inhibited the polymerization reaction with IC50 values of 1.5–1.6 μM:M, versus an IC50 value of 1.8 μM:M for CA4 (1a). The minor differences between the compounds were within experimental error as indicated by the standard deviations.
Similarly, all four cis-stilbenes were highly potent inhibitors of the colchicine binding assay. When present at a concentration one fifth of that of [3H]colchicine but equimolar to the tubulin concentration, binding of the radio labeled ligand was inhibited by 75–89% (note that the lowest and highest inhibitory effects were observed with stilbenes 11a and 13a, which were the two compounds that displayed the greatest inhibitory effects in the polymerization assay). In an earlier study, combretastatin A-3 (3a), with a hydroxyl substituent instead of the methoxy group or a halogen at position C-3 in the A ring, was found to be about half as active as CA4 (1a) as an inhibitor of tubulin assembly, about one fifth as active as an inhibitor of colchicine binding to tubulin, and about one seventh as active as an inhibitor of cell growth. (See Lin, C. M., et al, Interactions of Tubulin with Potent Natural and Synthetic Analogs of the Antimitotic Agent Combretastatin: A Structure-activity Study, Mol. Pharmacol., 1988, 34, 200–208). A related finding is that elimination of the C-3 substituent entirely, by replacing it with a hydrogen atom, results in about a 7-fold reduction in inhibitory effect on polymerization and complete loss of cytotoxic activity. (See Cushman, M., et al., Synthesis and Evaluation of (Z)-1-(4-methoxyphenyl)-2-(3,4,5-trimethoxyphenyl)ethane as Potential Cytotoxic and Antimitotic Agents, J. Med. Chem. 1992, 35, 2293–2306.)
Thus, while not intending to be bound by this theory, it appears the optimal activity observed with CA4 (1a) and the novel halocombstatins of the present invention requires a C-3 substituent of some size, where the fluorine atom may represent a minimum. Therefore, it seems unlikely that the predominant effect of the substituent results from direct enhancement of the interaction of ligand with protein. The A-ring substituents most likely cause the active cis-stilbenes to assume with greater probability a conformation that favors the drug-tubulin interaction. (See Hamel, E.; Evaluation of Antimitotic Agents by Quantitative Comparisons of Their Effects on the Polymerization of Purified Tubulin, Cell Biochem. Biophys., In Press.)
Tubulin polymerization was evaluated by turbidimetry at 350 nm using Beckman DU7400/7500 spectrophotometers as described in detail elsewhere. (See National Committee for Clinical Laboratory Standards. Reference Method for Broth Dilution Antifungal Susceptibility Testing of Yeasts. Approved Standard M27-A. Wayne, Pa.: NCCLS, 1997.) Varying concentrations of drug were preincubated with 10 μM:M (10 mg/mL) purified tubulin (See Hamel, E., et al., Separation of Active Tubulin and Microtubule-associated Proteins by Ultracentrifugation and Isolation of a Component Causing the Formation of Microtubule Bundles, Biochemistry 1984, 23, 4173–4184). Samples were chilled on ice, GTP (0.4 mM) was added, and polymerization was followed at 30° C. The parameter measured was extent of the reaction after 20 minutes. Colchicine binding was measured as described in detail previously. Reaction mixtures contained 1.0 μM:M tubulin, 5.0:M [3H]colchicine (from Dupont), and inhibitor at 1.0 μM:M. Incubation was for 10 minutes at 37° C.
The inventors have also demonstrated the ability of halocombstatins 11a and 12a to disrupt microtubules in human umbilical vein endothelial cells (HUVEC). HUVECs were isolated according to methods know to one of skill in the art (see Jaffe, E. A. et al., Culture of Human Endothelial Cells Derived From Umbilical Veins. Identification by Morphologic and Immunologic Criteria, J. Clin. Invest. 1973, 52, 2754–2756.)
In a further detailed series of experiments, compound 11a (flurocombstatin) was further evaluated against HUVECs in vitro. These cells showed significant sensitivity to the fluorocombstatin (11a): ED50 0.00025 μg/mL. Cords length as well as junction numbers were markedly reduced at both 0.01 and 0.001 μg/mL compared to untreated controls. Such activity against endothelial cells is significant, as endothelial cells are known to play a central role in the angiogenic process.
The halocombstatins of the present invention appear to also have antimicrobial properties. More specifically, they appear to have antifungal and/or antibacterial properties. Antimicrobial evaluation of the halocombstatins involved susceptibility testing performed by the reference broth microdilution assay. The antimicrobial activities of the halocombstatins were very similar, targeting Gram-positive bacteria and the pathogenic fungi Cryptococcus neoformans, and results are shown in Table III. The sodium phosphate dervative (16a) of fluorocombstatin (11a) did not retain significant antimicrobial activity.
Similarly, the inventors have previously shown that combretastatin A-3 but not its sodium phosphate prodrug inhibited growth of the pathogenic fungus Cryptococcus neoformans. (See Pettit, G. R., et al., Antineoplastic Agents 463. Synthesis of Combretastatin A-3 Diphosphates, Anticancer Drug Design 2000, 15, 397–404.) To determine the antimicrobial activity of the present compounds, susceptibility testing was performed by the reference broth microdilution assay. (See National Committee for Clinical Laboratory Standards. Methods for Dilution Antimicrobial Susceptibility Tests for Bacteria that Grow Aerobically. Approved Standard M7-A5. Wayne, Pa.: NCCLS, 2000. National Committee for Clinical Laboratory Standards. Reference Method for Broth Dilution Antifungal Susceptibility Testing of Yeasts. Aproved Standard M27-A. Wayne, Pa.: NCCLS, 1997.) The antimicrobial activities of the halocombretastatins of the present invention were very similar, targeting Gram-positive bacteria and Cryptococcus neoformans. This is illustrated in further detail in Table III. Thus, several of the novel compounds of the present invention appear to have potential as antimicrobial agents, such as antifungals and antibacterials.
Experimental Section
Materials and Methods. All solvents (ether refers to diethyl ether) and reagents were obtained from commercial sources (Acros Organics, Sigma-Aldrich Co., Alfa Aesar, City Chemicals or Lancaster Synthesis, Inc.). The 3-iodo-4,5-dimethoxybenzaldehyde was purchased from Lancaster Synthesis. Solvents were redistilled. Solvent extracts of aqueous solutions were dried over anhydrous magnesium sulfate. Gravity column chromatography was performed using silica gel from VWR Scientific 70–230 mesh) or from Merck (230–400 mesh). Analtech silica gel GHLF plates were employed for TLC.
All melting points were determined with an electrochemical digital melting point apparatus, Model 9100 or IA-9200, and are uncorrected. NMR spectra were recorded employing Varian Gemini 300 or Varian Unity 400 instruments. Chemical shifts are reported in ppm downfield from tramethylsilane as an internal standard in CDCl3 or where noted in D2O. High resolution mass spectra were obtained with a Kratos Ms-50 instrument (Midwest Center for Mass Spectroscopy, University of Nebraska-Lincoln) or in the Cancer Research Institute at Arizona State University with a Jeol LCmate instrument. Elemental analyses were determined by Galbraith Laboratories, Inc., Knoxville, Tenn.
General Procedure for Synthesis of Dimethoxyhalobenzaldehydes.
3-Fluoro-4,5-dimethoxybenzaldehyde. To a stirred solution prepared from 100 mL of DMF and 5-fluorovanillin (lit 1.0 g, 5.88 mmol). After 15 minutes, iodomethane was added, and stirring at room temperature continued for 16 hours. The reaction was terminated by the addition of water, the mixture was extracted with hexane (3×100 ML), and solvents were removed in vacuo. Purification by flash chromatography on a column of silica gel using hexane-ethyl acetate (4:1) as eluent afforded a colorless solid (1 g, 93% yield); mp 51–53° C. (Lit17 mp 52–53° C.) 1H-NMR (300 MHz, CDCl3) δ 3.94 (s, 3H), 4.05 (s, 3H), 7.24 (s, 1H), 7.26 (s, 1H), 9.82 (s, 1H).
3-Chloro-4,5-dimethoxybenzaldehyde. The preceding reaction was repeated with 5-chlorovanillin (10 g, 54 mmol) to give this compound, which was isolated as set forth in the preceding experiment to afford a colorless solid (10.4 g, 97% yield); mp 88–90° C. (Lit17 mp 87–89° C.); 1H-NMR (300 MHz, CDCl3) δ 3.95 (s, 3H), 3.96 (s, 3H), 7.36 (d, J=1.5 Hz, 1H), 7.50 (d, J=1.5 Hz, 1H), 9.85 (s, 1H).
3-Bromo-4,5-dimethoxybenzaldehyde. The experiment was repeated with 5-bromovanillin (10 g, 43.3 mmol) as described for the preceding aldehydes to give compound (6) which was separated by flash chromatography on a column of silica gel using hexane-ethyl acetate (9:1) as eluent to afford a colorless solid (8 g, 75% yield); mp 64–65° C.; 1H-NMR (300 MHz, CDCl3) δ 3.94 (s, 3H), 3.95 (s, 3H), 7.40 (d, 1H, J=1.8 Hz), 7.65 (d, 1H, J=1.8 Hz), 9.85 (s, 1H).
3,5-diiodo-4-methoxybenzaldehyde
3-Iodo-4,5-dimethoxybenzaldehyde was obtained from Sigma-Aldrich Chemical Company.
3-O-tert-Butlydiphenylsiloxy-4-methoxybenzyltriphenylphosphonium bromide (6). To 400 mL of dry dichloromethane was added benzyl alcohol 5 (84 g, 214 mmol) (Pettit, G. et al., Antineoplastic Agents 463, Synthesis of Combretastatin A-3 Diphosphates. Anticancer Drug Design 2000, 15, 397–404) and phosphorous tribromide (10 mL, 106 mmol, 0.5 eq). The reaction mixture was allowed to stir for 16 hours, and was terminated by the addition of 10% NaHCO3, and the product was extracted with dichloromethane. The solvent was removed (in vacuo), the resulting benzyl bromide was dissolved in 500 mL of toluene, and triphenylphosphine (62 g, 236 mmol, 1.1 eq) was added. The mixture was heated at reflux for 1 hour and stirred at RT for 15 hours. The precipitate was collected and triturated with ether to afford 132 g of phosphonium salt, in 86% yield; 1H-NMR (300 MHz CD3OD) δ 1.00 (s,9H), 3.51 (s,3H), 4.69 (d, 2H, J=17.4 Hz), 6.34 (dt, 1H, J=2.4, 8.1 Hz), 6.59 34 (d, 1H, J=8.1 Hz), 6.65 34 (t, 1H, J=2.4 Hz); and 13C NMR (75 MHz CD3OD) δ 20.47, 27.07, 55.60, 102.20, 113.15, 118.48, 119.60, 123.43, 126.56, 126.85, 128.17, 128.74, 131.07, 131.12, 133.91, 135.10, 135.23, 136.17, 136.55, 146.55, 152.76.
General Procedure for the Stilbene Syntheses.
3-Fluoro-4,4′,5-trimethoxy-3′-O-tert-butyldiphenylsilyl-Z-stilbene (7a). To a mixture of phosphonium salt 6 (4.7 g, 6.5 mmol) and tetrahydrofuran (25 ml, cooled to −78° C.) was added n-BuLi (2.6 mL, 2.5 M, 6.5 mmol, over 5 minutes), followed by stirring for one hour. Next, 3-fluoro-4,5-dimethoxybenzaldehyde (1g, 5.4 mmol) in tetrahydrofuran (10 ml) was added (dropwise) over 30 minutes. The mixture was allowed to warm to room temperature, and stirring continued for 16 hours. The reaction was terminated by the addition of water (50 mL), the product was extracted with ethyl acetate, solvents were removed in vacuo, and the residue (1:1 E/Z, 75% yield) obtained was subjected to flash chromatography on silica gel using hexane-ethyl acetate (9:1) as eluent to afford Z-stilbene 7a (1 g, 34%) as a clear oil; 1H-NMR (300 MHz, CDCl3) δ 1.07 (s, 9H), 3.46 (s, 3H), 3.65 (s, 3H), 3.90 (s, 3H), 6.24 (d, 1H, J=12 Hz), 6.33 (d, 1H, J=12 Hz), 6.56 (m, 2H), 6.72 (m, 3H), 7.35 (m, 6H), 7.70 (m, 4H); and 12C NMR (75 MHz, CDCl3) δ 19.75, 26.65, 55.07, 55.99, 61.43, 108.26, 108.28, 109.40, 109.55, 111.74, 120.83, 122.42, 127.36, 127.46, 127.48, 127.70, 129.37, 129.50, 129.63, 130.32, 132.59, 132.66, 133.57, 134.77, 135.27, 135.83, 135.95, 144.74, 149.88, 152.91, 152.95, 154.59, 156.53; HRMS (calcd for C33H36FO4Si) [M+H]+ 543.2368, found 543.2372.
Further elution gave the E-isomer 7b (1.2 g, 41% yield): 1H-NMR (300 MHz, CDCl3) δ 1.19 (s, 9H), 3.58 (s, 3H), 3.92 (s, 3H), 3.95 (s, 3H), 6.48 (d, 1H, J=159 Hz), 6.76 (d, 1H, J=8.7 Hz), 6.77 (d, 1H, J=16.5 Hz), 6.8 (d, 1H, J=1.5 Hz), 6.92 (d, 1H, J=2.1 Hz), 6.97 (dd, 1H, J=1.8, 8.4 Hz), 7.42 (m, 6H), 7.78 (m, 4H). 13C NMR (75 MHz, CDCl3) δ 19.76, 26.62, 55.20, 56.13, 61.39, 105.40, 106.45, 106.75 112.62, 117.62, 120.57, 125.26, 127.48, 128.52, 129.58, 139.68, 133.15, 133.28, 133.59, 135.35, 145.14, 150.52, 153.52. HRMS calcd for. C33H36FO4Si [M+H]+ 543.2368, found 543.2392.
3-Chloro-4,4′,5-trimethoxy-3′-O-tert-butyl-diphenylsilyl-Z-stilbene (8a). The experimental procedure noted above for 7a was repeated with 3-Chloro-4,5-dimethoxybenzaldehyde (2.8 g, 14 mmol) to yield the Z-isomer 8a (1.6 g, 21%) as a clear oil: 1H-NMR (300 MHz, CDCl3) δ 1.07 (s, 9H), 3.46 (s, 3H), 3.60 (s, 3H), 3.84 (s, 3H), 6.24 (d, 1H, J=12 Hz), 6.34 (d, 1H, J=12 Hz), 6.59 (s, 1H, J=7.5 Hz), 6.66 (s, 1H), 6.73 (d, 1H, J=9 Hz) 6.81 (s, 1H), 7.33 (m, 6H), 7.65 (dd, 4H, J=6.67, 1.2 Hz), and 13C NMR (125 MHz, CDCl3) δ 19.76, 26.66, 55.11, 55.82, 60.71, 111.35, 111.75, 120.86, 122.40, 122.46, 127.13, 127.38, 127.85, 129.32, 129.51, 130.27, 133.60, 133.81, 135.27, 144.22, 144.75, 149.91, 153.12; HRMS calcd for C33H36ClO4SiCl 561.2042 [M+H]+, found 561.2449, Cl 559.2071 [M+H]+; found 559.1996.
Continued elution of the chromatographic column led to the isolation of E-stilbene 8b (4.9 g, 62% yield) as a clear oil; 1H-NMR (300 MHz, CDCl3) δ 1.14 (s, 9H), 3.56 (s, 3H), 3.86 (s, 3H), 3.90 (s, 3H), 6.44 (d, 1H, J=16.5 Hz), 6.74 (d, 1H, J=16.5 Hz), 6.74 (s, 1H), 6.82 (d, 1H, J=1.5 Hz), 6.87 (d, 1H, J=1.8 Hz), 6.94 (dd, 1H, J=8.1, 2.1 Hz), 6.99 (d, 1H, J=1.5 Hz), 7.40 (m, 6H), 7.75 (m, 4H); and 13C NMR (75 MHz, CDCl3) δ 19.82, 26.67, 55.30, 55.09, 60.78, 108.43, 112.13, 117.71, 119.78, 120.59, 124.97, 127.53, 128.78, 129.61, 129.73, 133.65, 134.31, 135.41, 144.55, 150.61, 153.74.
3-Bromo-4,4′,5-trimethoxy-3′-O-tert-butyl-diphenylsilyl-Z-stilbene (9a). To 100 mL of THF was added phosphonium salt 6 (25.7 g, 36 mmol) and the solution cooled to −78° C. Once the temperature reached −78° C., n-BuLi (14.4 mL, 2.5 M, 36 mmol) was added over 5 minutes followed by stirring for one hour. Then the bromo-benzaldehyde (8 g, 33 mmol, in 100 mL THF) was added dropwise over 30 minutes. The mixture was allowed to warm to room temperature and stirring continued for 16 hours. The reaction was then terminated by the addition of water (50 mL), product was extracted with ethyl acetate, solvents were removed in vacuo, and the residue was separated by column chromatography to yield 4.2 g 9a (Z-stilbene), 2:1, E:Z (65% overall yield); HRMS (M+Na)+625.1364, (M+Na)+2 627.1338; IR 2962, 1730, 1510, 1267, 908, 735, 650 cm−1; 1H NMR (300 MHz, CDCl3) δ 1.07 (s, 9H), 3.45 (s, 3H), 3.58 (s, 3H), 3.82 (s, 3H), 6.97 (d, 1H, J=1.5 Hz), 6.23 (d, 1H, J=12 Hz), 6.32 (d, 1H, J=12 Hz), 6.52 (d, 1H, J=8.1 Hz), 6.71 (dd, 1H, J=1.5 Hz, J=8.1 Hz), 7.57 (d, 1H, J=1.5 Hz), 7.32 (m, 6H), 7.65 (dd, 4H); 13C NMR (100 MHz, CDCl3) δ 152.87, 149.79, 145.16, 144.66, 135.17, 134.37, 133.52, 130.40, 129.43, 129.24, 127.30, 126.90, 125.16, 122.40, 120.79, 117.18, 112.01, 111.71, 94.38, 60.61, 55.81, 55.15, 21.10.
Further elution of the chromatogram led to isolation of 8.1 g of the E-isomer 9b: IR 2934, 2859, 1710, 1510, 1275, 908, 732, 650 cm−1; 1H-NMR (300 MHz, CDCl3) δ 1.14 (s, 9H), 3.54 (s, 3H), 3.84 (s, 3H), 3.88 (s, 3H),), 6.46 (d, 1H, J=12 Hz), 6.76 (d, 1H, J=12 Hz), 6.71 (d, 1H, J=8.1 Hz), 6.85 (d, 1H, J=2.1 Hz), 6.87 (d, 1H, J=2.1), 6.94 (dd, 1H, J=8.4 Hz, J=2.4 Hz), 7.15 (d, 1H, J=2.4) 7.38 (m, 6H), 7.74 (dd, 4H); and 13C-NMR (75 MHz, CDCl3) δ 19.76, 26.65, 55.25, 56.03, 60.59, 109.18, 109.85, 112.13, 117.70, 120.57, 122.59, 124.79, 127.48, 128.80, 129.58, 133.64, 134.91, 135.35, 145.16, 150.57, 153.58.
3-Iodo-4,4′,5-trimethoxy-3′O-tert-butyl-diphenyl-Z-stilbene (10a). A gradient column chromatogram from 0–3% ethyl acetate in hexane afforded Z-stilbene 10a (1.4 g) in 21% yield mp 122–124° C.: HRMS, found: [M+H]+ 651.1474. C33H36O4Si requires [M+H]+, 651.1427; 1H-NMR (300 MHz, CDCl3) δ 1.07 (s, 9H), 3.45 (s, 3H), 3.55 (s, 3H), 3.79 (s, 3H), 6.21 (d, 1H, J=12 Hz), 6.31 (d, 1H, J=12 Hz), 6.59 (d, 1H, J=7.8 Hz), 6.72 (s, 2H), 6.77 (dd, 1H, J=7.8, 1.5 Hz), 7.19 (d, 1H, J=1.8 Hz), 7.32 (m, 6H), 7.64 (d, 4H, J=7.5 Hz); and 13C NMR (75 MHz, CDCl3) δ 19.68, 26.62, 55.05, 55.56, 60.33, 91.94, 111.72, 113.09, 120.78, 122.43, 126.73, 127.33, 129.32, 130.28, 130.93, 133.54, 135.17, 144.70, 149.82, 151.82.
General Procedure for Cleavage of the Silyl Ether Protecting Group.
3-Fluoro-4,4′,5-trimethoxy-3′-hydroxy-Z-stilbene (11a, Fluorcombstatin). A solution prepared from Z-isomer 7a (2.4 g, 4.4 mmol), tetrahydrofuran (50 ml) and 1M tetrabutylammonium fluoride (4.5 ml, 4.5 mmol) was stirred fro 3 hours. The reaction was terminated by the addition of water (50 ml), the mixture was extracted with ethyl acetate and the solvents were removed in vacuo. Separation by flash chromatography using: 1:4 ethyl acetate-hexane as eluent provided Z-stilbene (11a) (1.12 g, 83%) as a colorless solid, which was recrystallized from ethyl acetate-hexane: mp 93-94° C.; (300 MHz, CDCl3) δ 3.67 (s, 3H), 3.87 (s, 3H), 3.90 (s, 3H), 5.30 (bs, 1H), 6.35 (d, J=12 Hz, 1H), 6.48 (d, J=12 Hz, 1H), 6.61 (d, J=2.4 Hz, 1H), 6.64 (d, J=1.8 Hz, 1H), 6.72 (d, J=8.4 Hz, 1H), 6.75 (dd, J=1.5, 8.4 Hz, 2H), 6.86 (d, J=1.5 Hz, 1H); 13C NMR (75 MHz, CDCl3) δ 55.87, 56.01, 61.39, 108.24, 109.37, 109.57, 110.32, 114.83, 120.88, 127.72, 130.03, 130.14, 132.38, 132.48, 135.81, 135.95, 145.15, 145.78, 152.85, 152.88, 154.22, 156.65; and 19F NMR (CDCl3) δ −11.32 (d, J=12.8 Hz, 1F). HRMS calcd for C17H18FO4 305.1189 [M+H]+.
3-Fluoro-4,4′,5-trimethoxy-3′-hydroxy-E-stilbene (11b). Cleavage of silyl ester 7b (150 mg, 0.27 mmol) was performed as described for the synthesis of 11a. Separation by flash chromatography on silica using ethyl acetate-hexane (3:7) afforded a colorless solid 11b (75 mg, 88% yield): mp 86–87° C.; 1H NMR (300 MHz, CDCl3) δ 3.87 (s, 3H), 3.90 (s, 3H), 3.93 (s, 3H), 5.75 (bs, 1H), 6.77–6.86 (m, 5H), 6.93 (m, 1H), 6.86 (d, J=1.8 Hz, 1H). 13C NMR (75 MHz, CDCl3) δ 55.87, 56.18, 61.39, 100.64, 105.68, 106.51, 106.79, 107.55, 110.63, 111.76, 119.30, 125.80, 127.61, 128.62, 129.53, 130.56, 133.13, 133.23, 134.73, 136.41, 145.78, 146.59, 153.57, 154.40, 157.64.
3-Chloro-4,4′,5-trimethoxy-3′-hydroxy-Z-stilbene (12a). Deprotection of silyl ester 8a (1.5 g, 2.7 mmol) was conducted as summarized for the synthesis of 11a. Separation by flash chromatography on silica using ethyl acetate-hexane (3:7) gave compound 12a (754 mg, 89%). Recrystallization from hexane gave a white solid; mp 105–106° C.; 1H-NMR (300 MHz, CDCl3) δ 3.65 (s, 3H), 3.86 (s, 3H), 3.88 (s, 3H), 5.52 (s, 1H), 6.36 (d, 1H, J=12.3 Hz), 6.49 (d, 1H, J=12 Hz), 6.75 (m, 3H), 6.88 (m, 2H); 13C NMR (75 MHz, CDCl3)δ 55.86, 55.94, 60.76, 110.37, 111.40, 114.86, 114.94, 121.05, 122.51, 127.60, 127.92, 130.15, 130.43, 133.74, 144.36, 145.31, 145.92, 153.21.
3-Chloro-4,4′,5-trimethoxy-3′-hydroxy-E-stilbene 5 (12b). Column chromatography (elution with 7:3 hexane-ethyl acetate) afforded a colorless solid, E-isomer 12b, mp 138–140° C., in 79% yield: 1H-NMR (300 MHz, CDCl3) δ 3.87 (s, 3H), 3.88 (s, 3H), 3.90 (s, 3H), 5.69 (bs, 1H), 6.79 (d, 1H, J=15.9 Hz), 6.81 (d, 1H, J=8.4 Hz), 6.90 (d, 1H, J=1.5 Hz), 6.90 (d, 1H, J=15.9 Hz), 6.94 (dd, 1H, J=8.1, 1.5 Hz), 7.08 (dd, 1H, J=1.8 Hz), 7.11 (d, 1H, J=2.1 Hz); 13C NMR (75 MHz, CDCl3) δ 55.93, 56.06, 60.74, 100.66, 108.66, 110.65, 111.77, 119.38, 119.79, 125.49, 128.41, 128.85, 130.59, 134.24, 144.65, 145.79, 146.61, 153.78. HRMS calcd for C17H17ClO4 321.0894 [M+H]+, found 321.0893. Anal. Calcd for C17H17ClO4 C, H.
3-Bromo-4,4′,5-trimethoxy-3′-hydroxy-Z-stilbene (13a). The silyl ester cleavage reaction for 9a (4 g, 6.6 mmol) was completed as described for the synthesis of phenol 11a. Isolation by flash chromatography on silica gel using ethyl acetate-hexane (1:4) gave compound 13a (2.22 g of 92%). Recrystallization from hexane afforded a colorless solid: mp 108–109° C.; HRMS calcd for C17H17BrO4 364.0303, found [M+2] 366.0287; 1H NMR (300 MHz, CDCl3) δ 3.63 (s, 3H) 3.84 (s, 3H), 3.86 (s, 3H), 6.34 (d, 1H, J=12 Hz), 6.49 (d, 1H, J=12 Hz), 6.73 (d, 1H, J=8.4 Hz), 6.77 (dd, 1H, J=8.7, 1.8 Hz), 6.79 (d, 1H, J=1.8 Hz), 6.86 (d, 1H, J=1.5 Hz), 7.04 (d, 1H, J=1.5 Hz). 13C NMR (75 MHz, CDCl3) δ 55.77, 55.88, 60.56, 110.45, 112.13, 114.98, 117.18, 121.01, 125.28, 127.33, 130.07, 130.43, 134.37, 145.32, 146.02, 153.03. IR 3539, 3441, 3011, 2939, 2839, 1554, 1510, 1273, 1047, 908, 732 cm−1. HRMS calcd for C17H17O481Br. 366.0287.
3-Bromo-4,4′,5-trimethoxy-3′-hydroxy-E-stilbene (13b). By the same procedure used to obtain phenol 13a, silyl ester 9b was converted to E phenol 13b, and isolated by flash chromatography on silica gel with ethyl acetate-hexane (3:7) to give E-isomer 13b (0.14 g, 81%). Recrystallization from hexane gave colorless solid. mp 152–154° C.; 1H NMR (300 MHz, CDCl3) δ 3.86 (s, 3H), 3.89 (s, 3H), 3.90 (s, 3H), 6.80 (d, 1H, J=15.9 Hz), 7.38(d, 1H, J=15.9 Hz), 6.82 (d, 1H, J=8.4 Hz), 6.96 (dd, 1H, J=8.4, 2.4 Hz), 6.88 (s, 1H), 7.11 (d, 1H, J=1.8 Hz), 7.25 (d, 1H, J=1.5 Hz); and 13C NMR (75 MHz, CDCl3) δ 56.00, 56.11, 60.58, 94.36, 109.32, 110.60, 11.72, 117.81, 119.32, 122.58, 125.29, 128.82, 130.53, 134.81, 145.60, 145.70, 146.50, 153.53.
3-Iodo-4,4′,5-trimethoxy-3′-hydroxy-Z-stilbene (14a). The silyl ester cleavage reaction for 10a was completed as described for the phenol 11a. The crude product was separated by column chromatography using 1:4 ethyl acetate-hexane as eluent to give 1.38 g of Z-isomer 14a in 81% yield: mp 92–94° C.: HRMS calc for C17H18O4Si found (M+H)+ 413.0250. 1H NMR (300 MHz, CDCl3) δ 3.61 (s, 3H), 3.81 (s, 3H), 3.84 (s, 3H), 6.32 (d, 1H, J=12 Hz), 6.34 (s, 1H), 6.56 (d, 1H, J=12 Hz), 6.75 (s, 1H), 6.83 (d, 1H, J=1.8 Hz), 6.85 (s, 3H), 7.25 (d, 1H, J=1.5 Hz); and 13C NMR (75 MHz, CDCl3) δ 55.56, 55.82, 60.33, 91.78, 110.50, 113.11, 115.00, 120.91, 126.96, 129.94, 130.28, 135.93 145.29, 146.10, 147.67, 151.79. IR 3543, 3011, 2937, 2841, 1510, 1273, 1001, 908, 732 cm−1.
3-Iodo-4,4′,5-trimethoxy-3′-hydroxy-E-stilbene (14b). Separation by column chromatography (30% ethyl acetate-hexane as eluent) gave 0.29 g of E-isomer 14b in 98% yield: mp 111–113° C.; 1H NMR (300 MHz, CDCl3) δ 3.84 (s, 3H), 3.87 (s, 3H), 3.88 (s, 3H), 5.85 (bs, 1H), 6.77 (d, 1H, J=16.5 Hz), 6.89 (d, 1H, J=16.5 Hz), 6.82 (s, 1H), 6.96 (s, 1H), 6.93 (d, 1H, J=2.4 Hz), 7.11 (d, 1H, J=1.5 Hz), 7.46 (d, 1H, J=1.5 Hz); and 13C NMR (75 MHz, CDCl3) δ 55.85, 60.41, 92.56, 110.40, 110.63, 111.77, 119.28, 124.97, 128.36, 128.70, 130.15, 135.71, 145.71, 146.56, 148.11, 152.44.
Dibenzyl (Z)-3-fluoro-4,4′,5-trimethoxy-Z-stilbene 3′-O-phosphate (15). Z-stilbene 11a (1.1 g, 3.6 mmol) in 20 mL of acetonitrile (20 mL) and 3.5 mL (36 mmol) of carbon tetrachloride was cooled to −10° C., and stirred for 10 minutes. Then DIPEA (1.3 mL, 7.4 mmol), immediately followed by DMAP (44 mg, 0.36 mmol), were added. After 1 minute dibenzyl phosphite (1.2 mL, 5.4 mmol) was added over 5 minutes, and the mixture was stirred for an additional 3 hours at −10° C. The reaction was terminated by the addition of 0.5 M KH2PO4, the mixture was extracted with ethyl acetate, solvents were removed in vacuo, and the product was isolated by column chromatography (1:1 elution with ethyl acetate-hexane) to yield 1.5 g of phosphate in 74% yield: b.p. dec. 280° C. (0.01 mmHg); 1H-NMR (500 MHz, CDCl3) δ 3.65 (s, 3H), 3.77 (s, 3H), 3.87 (s, 3H), 5.12 (s, 2H), 5.14 (s, 2H), 6.38 (d, 1H, J=12 Hz), 6.43 (d, 1H, J=12Hz), 6.57 (s, 1H) 6.62 (dd, 1H, J=1.5, 11.5 Hz), 6.78 (d, 1H, J=8.5 Hz), 7.03 (d, 1H, J=8.5 Hz), 7.12 (s, 1H), 7.82 (m, 10H); 13C NMR (125 MHz, CDCl3) δ; and 31P NMR (162 MHz CDCl3) δ −7.84 (s).
Dibenzyl (3-bromo-4,4′,5-trimethoxy-Z-stilbene 3′-O-phosphate (16). The preceding reaction (see Compound 15) was repeated with Z-stilbene 13a (1 g, 2.7 mmol) to afford 1.6 g of phosphate 16 in 94% yield: b.p. dec. 271° C. (0.01 mmHg); 1H-NMR (300 MHz, CDCl3) δ 3.59 (s, 3H), 3.76 (s, 3H), 3.79 (s, 3H), 5.11 (s, 2H), 5.13 (s, 2H ), 6.37 (d, 1H, J=1.24 Hz), 6.43 (d, 1H, J=12 Hz), 6.72 (d, 1H, J=1.5 Hz), 6.78 (d, 1H, J=8.4 Hz), 7.02 (d, 1H, J=8.2 Hz), 7.03 (d, 1H, J=2.4 Hz), 7.10 (d, 1H, J=1.8 Hz), 7.28 (m, 10H); 13C NMR (75 MHz, CDCl3) δ 55.77, 55.88, 60.51, 65.59, 69.67, 69.73, 111.83, 112.22, 117.23, 121.96, 121.99, 125.04, 126.32, 126.75, 127.30, 127.69, 127.77, 127.88, 128.31, 128.35, 129.46, 129.47, 133.93, 135.44, 135.51, 139.30, 139.38, 145.30, 149.77, 149.82, 152.99; and 31P NMR (162 MHz CDCl3) δ −7.84 (s).
Dibenzyl 3-iodo-4,4′,5-trimethoxy-Z-stilbene 3′-O-phosphate (17). The phosphorylation reaction used to obtain phosphate 15 was repeated with Z-stilbene 14a (2.39 g, 0.95 mmol) to obtain 0.55 g of Z-stilbene 17 in 86% yield as a colorless oil: b.p. dec. 274° C. (0.01 mmHg); HRMS calc for C31H31PO7 [M+H]+ 673.0852; found [M+H]+, 673.0808. 1H-NMR (300 MHz, CDCl3) δ 3.51 (s, 3H), 3.65 (s, 3H), 3.72 (s, 3H), 5.04 (s, 2H), 5.06 (s, 2H), 6.36 (d, 1H, J=9Hz), 6.42 (d, 1H, J=9Hz), 6.77 (d, 1H, J=1.2 Hz), 6.89 (d, 1H, J=6 Hz), 7.02 (d, 1H, J=6 Hz), 7.01 (s, 1H), 7.19 (d, 1H, J=1.2 Hz), 7.28 (m, 10H); and 13C-NMR (75 MHz, CDCl3) δ 56.20, 56.50, 60.73, 71.18, 71.24, 92.73, 113.72, 114.23, 122.58, 122.61, 128.10, 128.93, 129.50, 129.56, 130.18, 130.85, 130.86, 131.87, 136.26, 136.66, 136.73, 140.32, 140.39, 149.12, 151.21, 151.25, 153.26.
General Procedure for Synthesis of Phosphate Cation Derivatives
Method A. Each of the metal cation containing salts were obtained by the procedure outlined below for preparing sodium salt 19a. The metal counter ions were introduced by treatment of the phosphoric acid with either the corresponding hydroxide (e.g., potassium, lithium) or acetate (e.g. magnesium).
Sodium 3-bromo-4,4′,-5-trimethoxy-Z-stilbene 3′-O-phosphate (19a). To a solution of dibenzyl phosphate 16 (0.28 g, 0.45 mmol) in dry dichloromethane (10 mL) was added trimethylsilylbromide (125 μL, 0.95 mmol). The reaction mixture was stirred for 30 minutes under argon, and the reaction was terminated by the addition of methanol (20 mL). Following removal of solvents (in vacuo), the free phosphoric acid was dissolved in ethanol (10 mL) and sodium methoxide (49 mg, 0.9 mmol) were added to the residue. After the reaction mixture was stirred for 30 minutes, the precipitate was collected and washed with ether to provide sodium salt 19a (0.17 g) as a colorless solid: m.p. 196–197° C.; 1H-NMR (300 MHz, D2O) δ 3.53 (s, 3H), 3.68 (s, 3H), 3.70 (s, 3H), 6.52 (d, 1H, J=12 Hz), 6.72 (d, 1H, J=12Hz), 6.75 (s, 1H), 6.77 (s, 1H), 6.79 (s, 1H), 7.01 (s, 1H), 7.15 (s, 1H).
Sodium 3-fluoro-4,4′,5-trimethoxy-Z-stilbene 3′-O-phosphate (18a). m.p. 200–202° C.; 1H-NMR (300 MHz, D2O) δ 3.52 (s, 3H), 3.67 (s, 3H), 3.68 (s, 3H), 6.52 (d, 1H, J=12 Hz), 6.71 (d, 1H, J=12 Hz), 6.72 (s, 1H), 6.78 (s, 1H), 6.79 (s, 1H), 7.03 (s, 1H), 7.16 (s, 1H).
Lithium 3-bromo-4,4′,5-trimethoxy-Z-stilbene 3′-O-phosphate (19b). m.p. 265–268° C. (dec); 1H NMR (300 MHz, D2O) δ 3.53 (s, 3H), 3.66 (s, 3H), 3.69 (s, 3H), 6.35 (d, 1H, J=12 Hz), 6.52 (d, 1H, J=12 Hz), 6.70 (s, 2H), 6.81 (d, 1H, J=1.5 Hz), 7.01 (d, 1H, J =1.5 Hz), 7.23 (s, 1H).
Potassium 3-bromo-4,4′,5-trimethoxy-Z-stilbene 3′-O-phosphate (19c). m.p. 230–233° C. (dec); 1H-NMR (300 MHz, D2O) δ 3.53 (s, 3H), 3.66 (s, 3H), 3.69 (s, 3H), 6.35 (d, 1H, J=12 Hz), 6.52 (d, 1H, J=12 Hz), 6.70 (s, 2H), 6.81 (d, 1H, J=1.5 Hz), 7.01 (d, 1H, J=1.5 Hz), 7.23 (s, 1H).
Cesium 3-bromo-4,4′,5-trimethoxy-phenyl-Z-stilbene 3′-O-phosphate (19d). m.p. 233–235° C.; 1H-NMR (300 MHz, DMSO) δ 3.51 (s, 3H), 3.62 (s, 3H), 3.65 (s, 3H), 6.38 (d, 1H, J=12 Hz), 6.50 (d, 1H, J=12 Hz), 6.71 (s, 1H), 6.83 (d, 1H, J=1.5 Hz), 703 (d, 2H, J=1.5 Hz), 7.23 (s, 1H).
Rubidium 3-bromo-4,4′,5-trimethoxy-Z-stilbene 3′-O-phosphate (19e). m.p. 204–206° C.; 1H-NMR (300 MHz, DMSO) δ 3.50 (s, 3H), 3.64 (s, 3H), 3.66 (s, 3H), 6.35 (d, 1H, J=12 Hz), 6.52 (d, 1H, J=12 Hz), 6.68 (s, 2H), 6.80 (d, 2H, J=1.5 Hz), 7.00 (d, 2H, J=1.5 Hz), 7.25 (s, 1H).
Calcium 3-bromo-4,4′,5-trimethoxy-Z-stilbene 3′-O-phosphate (19f). m.p. 245–248° C. (dec); 1H-NMR (300 MHz, DMSO) δ 3.53 (s, 3H), 3.69 (s, 3H), 3.70 (s, 3H), 6.33 (d, 1H, J=12 Hz), 6.50 (d, 1H, J=12 Hz), 6.71 (s, 2H), 6.81 (d, 2H, J=1.5 Hz), 7.99 (d, 2H, J=1.5 Hz), 7.23 (s, 1H).
Magnesium 3-bromo-4,4′,5-trimethoxy-Z-stilbene 3′-O-phosphate (19g). m.p. 280–285° C. (dec); 1H-NMR (300 MHz, DMSO) δ 3.50 (s, 3H) 3.60 (s, 3H), 3.65 (s, 3H), 6.33 (d, 1H, J=12 Hz), 6.50 (d, 1H, J=12 Hz), 6.68 (s, 2H), 6.79 (d, 2H, J=1.5 Hz), 7.00 (d, 2H, J=1.5 Hz), 7.21 (s, 1H).
Sodium 3-iodo-4,4′,5-trimethoxy-Z-stilbene 3′-O-phosphate (20a). m.p. 194–195° C., 1H-NMR (300 MHz, D2O) δ 3.50 (s, 3H), 3.67 (s, 3H), 3.68 (s, 3H), 6.50 (d, 1H, J=12 Hz), 6.70 (d, 1H, J=12 Hz), 6.72 (s, 1H), 6.77 (s, 1H), 6.79 (s, 1H), 7.01 (s, 1H), 7.13 (s, 1H).
Method B The potassium salt 18c (approximately 30 mg) was dissolved in de-ionized water (1 mL) and applied to a Dowex-50w (HCR-W2) resin column (amine or amino acid) and developed by water. The eluent was concentrated by freeze drying to give the required compound.
3-Iodo-4,4′,5-trimethoxy-3′-O-tert-butyldiphenylsilyl-Z-stilbene (10a) and 3-Iodo-4,4′,5-trimethoxy-3′-O-tert-butyldiphenylsilyl-E-stilbene (10b).
Method A. Phosphonium bromide 6 (3.67 g, 5.13 mmol) was dissolved in DCM at 0° C. Sodium hydride (60% dispersion in mineral oil, 0.41 g, 10.2 mmol) was added and the mixture turned orange. Next, 3-iodo-4,5-dimethoxybenzaldehyde (1 g, 3.42 mmol) was added and stirring was continued for 21 hrs. The reaction was terminated by adding water (50 mL) and extracted with DCM (3×50 mL), which was dried, filtered and concentrated. The oil obtained was subjected to flash chromatography on silica gel with the eluent 0–3% ethyl acetate in hexane to afford Z-stilbene 10a (0.86 g, 39%) which crystallized as a colorless solid from hexane: mp 122–124° C.: 1H-NMR (300 MHz, CDCl3) δ 1.07 (s, 9 H), 3.45 (s, 3 H), 3.55 (s, 3 H), 3.79 (s, 3 H), 6.21 (d, 1 H, J=12 Hz), 6.31 (d, 1 H, J=12 Hz), 6.59 (d, 1 H, J=7.8 Hz), 6.72 (s, 2 H), 6.77 (dd, 1 H, J=7.8, 1.5 Hz), 7.19 (d, 1 H, J=1.8 Hz), 7.40–7.20 (m, 6H), 7.64 (d, 4H, J=7.5 Hz); 13C-NMR (75 MHz, CDCl3) δ 19.68, 26.62, 55.05, 55.56, 60.33, 91.94, 111.72, 113.09, 120.78, 122.43, 126.73, 127.33, 129.32, 130.28, 130.93, 133.54, 135.17, 144.70, 149.82, 151.82; HRMS calcd for C33H36IO4Si 651.1428 [M+H]+, found 651.1474; Anal. calcd for C33H35I04Si C, 60.92; H, 5.45. Found, C, 60.79; H, 5.67%.
Further elution gave E-stilbene 10b (0.96 g, 43%) that crystallized from hexane as a colorless solid; mp 98–99° C.; 1H-NMR (300 MHz, CDCl3) δ 1.14 (s, 9H), 3.55 (s, 3H), 3.82 (s, 3H), 3.82 (s, 3H), 3.89 (s, 3H), 6.43 (d, 1H, J=15.9 Hz), 6.71–6.76 (m,2H), 6.86–6.95 (m, 3H), 7.33 –7.42 (m, 6H); 13C-NMR (100 MHz, CDCl3) δ 19.81, 26.67, 55.28, 60.50, 92.65, 110.22, 112.11, 117.70, 120.56, 124.58, 127.52, 128.45; 128.68, 129.60, 129.77, 133.64, 135.38, 135.82, 145.18, 148.13, 150.56, 152.49; HRMS calcd for C33H36IO4Si 651.1428 [M+H]+, found 651.1400; Anal. calcd for C33H35I04Si, C, 60.92; H, 5.42, found C, 60.88; H, 5.63%.
Method B. Butyllithium (4.5 mL, 11.3 mmol) was added to a stirred and cooled (−70° C.) suspension of phosphonium bromide 6 in dry THF (100 mL). The solution was stirred for 30 min at −70° C. then 6 hours at room temperature. Water (50 mL) was added and the reaction mixture was extracted with EtOAc (3×100 mL), the extract dried, filtered and concentrated. The oil obtained was subjected to flash chromatography on silica eluent 0–3% ethyl acetate in hexane to afford Z-stilbene 10a (1.4 g, 21%) as a colorless solid: mp 122–124° C.
3,5-diiodo-4,4′-dimethoxy-3′-O-tert-butyl-diphenylsilyl-Z-stilbene and 3,5-diiodo-4,4′-dimethoxy-3′-O-tert-butyl-diphenylsilyl-E-stilbene
Method A. Phosphonium bromide 6 (2.77 g, 3.87 mmol) (8) was dissolved in DCM at 0° C. When sodium hydride (60% dispersion in mineral oil, 0.31 g, 7.7 mmol) was added, the mixture turned orange. Aldehyde (1.0 g, 2.57 mmol) was added and stirring was continued for 7.5 hrs. The reaction was terminated by adding water (50 mL) and extracted with DCM (3×50 mL). The organic extract was dried, filtered and concentrated. The oily residue was subjected to flash chromatography on silica gel using hexane as eluent to give an isomeric mixture of the title compounds (71% yield, 1.35 g). Further elution gave E-isomer (0.10 g, 5%) as a colorless oil in pure form: 1H-NMR (300 MHz, CDCl3) δ 1.14 (s, 9H), 3.56 (s, 3H), 3.84 (s, 3H), 6.33(d, 1 H, J 15.9 Hz), 6.72 (d, 1 H, J 8.4 Hz), 6.73 (d, 1 H, J 15.9 Hz), 6.72 (d, 1 H, J 8.4 Hz, ArH), 6.85 (d, 1H, J 2.1 Hz), 6.92 (dd, 1H, J 1.8 Hz and J 8.4 Hz), 7.34–7.46 (m, 6H) and 7.72–7.75 (m, 6H); 13C-NMR (100 MHz, CDCl3) δ 19.82, 26.69, 55.30, 60.77, 90.59, 112.09, 117.73, 120.83, 122.47, 127.55, 129.38, 129.65, 129.99, 133.58, 135.40, 137.15, 137.73, 145.22, 150.84 and 157.55; and HRMS calcd for C32H33I2O3Si 747.0289 [M+H]+, found 747.0442.
Method B. Butyllithium (0.6 mL, 1.47 mmol) was added to a stirred and cooled (−10° C.) suspension of phosphonium bromide 6 (1.01 g, 1.4 mmol) in dry THF (80 mL). The orange-red solution was stirred for 10 minutes at room temperature. Aldehyde (0.50 g, 1.33 mmol) was added and the reaction mixture color changed from red to yellow. Stirring was continued at room temperature for 10 minutes, ice water (100 mL) was added and the mixture extracted with EtOAc (3×100 mL). The extract was washed with water (100 mL), dried, filtered and concentrated. The resulting oil was partially separated by flash chromatography on silica gel using hexane-EtOAc (100:1) as eluent to give an isomeric mixture in a ratio approximately 1:1.9, (cis:trans, 0.90 g, 90%).
3-Iodo-4,4′,5-trimethoxy-3′-hydroxy-Z-stilbene (14a). To a solution of silyl ether 7a (1.30 g, 1.99 mmol) in THF was added tetrabutylammonium flouride (2.2 mL, 2.2 mmol). The mixture was stirred under Ar in the dark for 10 min. and the reaction was terminated by the addition of water (5 mL), the product was extracted with EtOAc (3×15 mL), and the extract dried, filtered and concentrated. The crude product was separated by silica gel column chromatography using 1:4 ethyl acetate-hexane as eluent to give stilbene 14a (0.70 g, 85%) as colorless solid: mp 92–94° C.; IR 3543, 3011, 2937, 2841, 1510, 1273, 1001, 908, 732 cm−1; 1H-NMR (300 MHz, CDCl3) δ 3.61 (s, 3 H), 3.81 (s, 3 H), 3.84 (s, 3 H), 6.32 (d, 1 H, J=12 Hz), 6.34 (s, 1 H), 6.56 (d, 1 H, J=12 Hz), 6.75 (s, 1 H), 6.83 (d, 1 H, J=1.8 Hz), 6.85 (s, 3 H), 7.25 (d, 1 H, J=1.5 Hz); 13C-NMR (75 MHz, CDCl3) δ 55.56, 55.82, 60.33, 91.78, 110.50, 113.11, 115.00, 120.91, 126.96, 129.94, 130.28, 135.93 145.29, 146.10, 147.67, 151.79; HRMS calcd for C17H18IO4 413.0259 [M+H]+, found 413.0250. Anal. calcd for C17H17IO4 C, 49.53; H, 4.16. Found C, 49.38; H, 4.24%.
3-Iodo-4,4′,5-trimethoxy-3′-hydroxy-E-stilbene (9b). The trans isomer 14b (0.29 g, 98%) was obtained from silyl ether 10b (0.46 g, 0.7 mmol) as described above for the synthesis of the cis isomer 14a. Separation by column chromatography (7:3 hexane-ethyl acetate as eluent) gave E-isomer 14b (0.29 g, 98%) as colorless solid: mp 111-113° C.; 1H-NMR (300 MHz, CDCl3) δ 3.84 (s, 3 H), 3.87 (s, 3 H), 3.88 (s, 3 H), 5.85 (bs, 1 H), 6.77 (d, 1 H, J=16.5 Hz), 6.89 (d, 1 H, J=16.5 Hz), 6.82 (s, 1 H), 6.96 (s, 1 H), 6.93 (d, 1 H, J=2.4 Hz), 7.11 (d, 1 H, J=1.5 Hz), 7.46 (d, 1 H, J=1.5 Hz); 13C-NMR (75 MHz, CDCl3) δ 55.85, 60.41, 92.56, 110.40, 110.63, 111.77, 119.28, 124.97, 128.36, 128.70, 130.15, 135.71, 145.71, 146.56, 148.11, 152.44; HRMS calcd for C17H18IO4 413.0257 [M+H]+, found 413.0250. Anal. calcd for C17H17IO4 C, 49.53; H, 4.16. Found, C, 49.38; H, 4.24%.
3,5-diiodo-4,4′-dimethoxy-3′-hydroxy-Z-stilbene 22a and 3,5-diiodo-4,4′-dimethoxy-3′-hydroxy-E-stilbene 22b
These stilbenes were obtained from the Z and E silyl ether mixture 21ab (1.35 g, 1.81 mmol) as described above for the synthesis of cis-isomer 14a. The oily mixture was separated by column chromatography with 2:1 hexane-EtOAc as eluent to provide cis-isomer 22a as an oil (0.45 g, 49%): 1H-NMR (300 MHz, CDCl3) δ 3.85 (s, 3 H), 3.89 (s, 3H), 5.54 (s, 1 H), 6.26 (d, 1 H, J=12 Hz), 6.49 (d, 1 H, J=12 Hz), 6.74 (s, 2H), 6.82 (s, 1 H) and 7.67 (s, 2 H); 13C-NMR (125 MHz, CDCl3) δ 55.98, 60.73, 89.98, 110.46, 114.87, 120.98, 125.08, 29.47, 131.57, 137.37, 139.96, 145.42, 146.21, 157.50. HRMS calcd for C16H15I2O3 508.9113 [M+H]+, found 508.9111. Anal. calcd for C16H14I2O3 C, 37.82; H, 2.78. Found, C, 37.80; H, 2.83.
Further elution led to the E-stilbene 22b (0.46 g, 50% yield) as a colorless solid which was crystallized from hexane: mp 127–129° C.; 1H-NMR (300 MHz, CDCl3) δ 3.86 (s, 3 H), 3.91 (s, 3 H), 5.62 (s, 1 H), 6.71 (d, 1 H, J=16.5 Hz), 6.83 (d, 1 H, J=8.1 Hz), 6.90 (d, 1 H, J=17.1 Hz), 6.95 (d, 1 H, J=8.4 Hz), 7.10 (d, 1 H, J=2.4 Hz) and 7.85 (s, 2 , H-2); 13C-NMR (75 MHz, CDCl3) δ 55.51, 60.30, 90.17, 100.17, 100.21, 110.18, 111.35, 119.17, 122.56, 129.63, 129.81, 136.82, 137.19, 146.34 and 157.25; HRMS calcd for C16H15I2O3 508.9113 [M+H]+, found 508.9119. Anal. calcd for C16H14I2O3 C, 37.82; H, 2.78. Found, C, 38.01; H, 2.91.
3,5-diiodo-4,4′-dimethoxy-3′-acetyl-Z-stilbene (22c)
An appropriate phenol 22a (0.45 g) was dissolved in pyridine (3 mL)-acetic anhydride (170 μL) and stirred for 2 hrs. The mixture was concentrated under reduced pressure from toluene (3×10 mL). The residue was diluted with EtOAc (30 mL), washed successively with water (10 mL), NaHCO3 (10% aq. sol., 10 mL), dried, and the solution filtered and concentrated. The acetate was further purified by flash chromatography on silica using 1:24 hexane-EtOAc:hexane as eluent to afford acetate 22c (0.20 g, 41%) as a colorless solid:recrystallized from hexane mp 121–122° C.; 1H-NMR (300 MHz, CDCl3) δ 2.29 (s, 3 H), 3.83 (s, 3 H), 3.85 (s, 3 H), 6.29 (d, 1 H, J=12 Hz), 6.48 (d, 1 H, J=12 Hz), 6.85 (d, 1 H, J=8.7 Hz), 6.93 (d, 1 H, J=2.43), 7.06 (d, 1 H, J=1.5), 7.09 (d, 1 H, J=2.4 Hz) and 7.67 (s, 2 H); 13C-NMR (125 MHz, CDCl3) δ 20.66, 55.94, 60.72, 90.11, 112.16, 123.25, 125.41, 127.47, 128.85, 130.64, 137.10, 139.54, 139.89, 150.69, 157.67 and 168.79; HRMS calcd for C19H20I2O5582.9479 [M+CH3OH]+, found 582.9482; Anal. calcd for C18H16I2O4 C, 39.30; H, 2.93. Found C, 39.30; H, 3.13%.
3-iodo-4,4′,5-trimethoxy-3′-acetyl-Z-stilbene
An appropriate phenol (0.1 g, 0.24 mmol) was dissolved in 3 mL anhydrous pyridine. Acetic anhydride (50 μL, 0.51 mmol) was added with cat DMAP. The mixture was stirred for 90 minutes. The reaction was terminated by the addition of 5 mL CH3OH. The mixture was diluted with toluene and concentrated under reduced pressure. It was purified on flash chromatography on silica gel using EtOAc:hexane (1:9) as eluent to give a white solid (0.1 mg, 91%). The solid was crystallized from hexane: mp 103–104° C.; 1H-NMR (300 MHz, CDCl3) δ 2.27 (s, 3H), 3.61 (s, 3H), 3.81 (s, 6H), 6.38 (d, 1H, J=12 Hz), 6.48 (d, 1H, J=12 Hz), 6.77 (d, 1H, J=1.8 Hz), 6.83 (d, 1H, J=8.4 Hz), 6.96 (d, 1H,J=1.5 Hz), 7.09 (dd, 1H, J=8.4 Hz, J=2.4 Hz), and 7.26 (s, 1H); 13C-NMR (125 MHz, CDCl3)δ 20.61, 55.67, 55.93, 60.44, 92.07, 112.07, 112.92, 123.17, 127.63, 127.74, 129.39, 129.65, 103.97, 134.96, 139.49, 147.99, 150.39, 152.05 and 168.81; HRMS calcd for C19H20IO5 455.0355 [M+H]+, found 455.0356. Anal. calcd for C19H19IO5 C, 50.24; H, 4.22. Found, C, 49.67; H, 4.18 %.
Dibenzyl 3,5-diiodo-4,4′-dimethoxy-Z-stilbene 3′-O-phosphate (23)
An appropriate dibenzyl phosphate (0.38 g, 55% yield) was obtained (0.46 g, 0.91 mmol) as described above for the synthesis of iodide 10a. Colorless oil: bp dec 220° C.; 1H-NMR (300 MHz, CDCl3)δ 3.78 (s, 3 H), 3.81 (s, 6 H), 5.13 (s, 2 H), 5.16 (s, 2 H), 6,28 (d, 1 H, J=12 Hz), 6.42 (d, 1 H, J 12 Hz), 6.78 (d, 1 H, J 9 Hz), 7.00 (d, 1 H, J 8.7 Hz), 7.07 (s, 1 H), 7.33 (s, 10 H) and 7.64 (s, 2 H); 13C-NMR (100 MHz, CDCl3)δ 55.96, 60.71, 69.83, 69.89, 90.15, 112.40, 122.23, 122.26, 125.60, 126.20, 126.21, 127.93, 128.49, 128.55, 130.66, 137.12, 139.92 and 157.68; HRMS calcd for C30H28I2O6P 768.9713 [M+H]+, found 768.9699; 31P-NMR (162 MHz, CDCl3)δ −5.51.
General Procedures for Syntheses of the Phosphoric Acids and Derivatives.
Method A. Each of the metal cation phosphate salts was obtained by the procedure outlined herein for preparing the potassium salt 20c, except for the metal counterions introduced by treatment of the phosphoric acid using either lithium hydroxide or sodium methoxide.
Method B. Dowex-50W (2 g) (HCR-W2) was placed in a column and washed successively with CH3OH (50 mL), 1 N HCl (until pH 1), water (until pH 7), base/amine/amino acid (until pH 7–14) and water (until pH 7). The column was recycled. The potassium salt or its corresponding diiodo phosphate salt (about 25 mg) was dissolved in de-ionized water (1 mL) and applied to a Dowex-50W (HCR-W2) resin column (bearing the appropriate amine or amino acid methyl ester) and developed with approximately 40 mL of water. The eluent was concentrated by freeze drying to give the required cation derivative.
Method C. Amino Acid Methyl Esters. The amino acid methyl ester hydrochloride was neutralized in CH3OH solution by adding potassium carbonate. Ether was added to precipitate the potassium chloride and the solution was filtered and concentrated. The amino acid methyl ester residue was then applied to the Dowex-50W (HCR-W2) resin column as described in Method B.
Potassium 3-iodo-4,4′,5-trimethoxy-Z-stilbene 3′-O-phosphate (20c).
Trimethylbromosilane (277 μL, 1.8 mmol) was added to a cooled (0° C.) solution of phosphate 9a in DCM (40 mL). After stirring for 90 minutes, sodium thiosulfate (10% aq., 10 mL) was added and the mixture was stirred for an additional 1 minute. The phases were separated and the aqueous phase extracted with DCM (20 mL), followed by EtOAc (2×20 mL). The combined organic extracts were dried, filtered and concentrated to afford the phosphoric acid intermediate as a clear oil. After drying (high vacuum) for 1 hour, the oil was dissolved in CH3OH (10 mL), cooled to 0° C., and KOH (1.8 mL, 1 M sol. in CH3OH) was added. The mixture was stirred for 20 minutes, the precipitate was collected and triturated with ether to afford the potassium salt as a colorless solid: mp 197–198° C. (dec); 1H-NMR (300 MHz, D2O)δ 3.51 (s, 3 H), 3.64 (s, 3 H), 3.71 (s, 3 H), 6.33 (d, 1 H, J=12 Hz), 6.51 (d, 1 H, J=12 Hz), 6.70 (s, 2 H), 6.84 (s, 1 H) and 7.22 (s, 2 H); and 31P-NMR (162 MHz, D2O)δ 0.94.
Sodium 3-iodo-4,4′,5-trimethoxy-Z-stilbene 3′-O-phosphate (20a).
Isolated as a colorless solid: mp 194–195° C. (dec); 1H-NMR (300 MHz, D2O)δ 3.50 (s, 3 H), 3.67 (s, 3 H), 3.68 (s, 3 H), 6.50 (d, 1 H, J=12 Hz), 6.70 (d, 1 H, J=12 Hz), 6.72 (s, 1 H), 6.77 (s, 1 H), 6.79 (s, 1 H), 7.01 (s, 1 H) and 7.13 (s, 1 H).
Lithium 3-iodo-4,4′,5-trimethoxy-Z-stilbene 3′-O-phosphate (11c).
Discovered as a colorless solid: mp 245–275° C. (dec); 1H-NMR (400 MHz, D2O)δ 3.50 (s, 3 H), 3.62 (s, 3 H), 3.66 (s, 3 H), 6.33 (d, 1 H, J=12 Hz), 6.49 (d, 1 H, J=12 Hz), 6.70 (s, 2 H), 6.83 (s, 1 H), 7.20 (s, 1 H) and 7.22 (s, 1 H).
Morpholine 3-iodo-4,4′,5-trimethoxy-Z-stilbene 3′-O-phosphate.
Another colorless oil: 1H-NMR (300 MHz , D2O)δ 3.11–3.15 (m, 8 H), 3.50 (s, 3 H), 3.63 (s, 3 H), 3.68 (s, 3 H), 3.77–3.81 (m, 8 H), 6.33 (d, 1 H, J 12 Hz), 6.50 (d, 1 H, J12 Hz), 6.73 (s, 2 H), 6.82 (s, 1 H), 7.18 (s, 1 H) and 7.20 (s, 1 H).
Piperidene 3-iodo-4,4′,5-trimethoxy-Z-stilbene 3′-O-phosphate.
Colorless oil: 1H-NMR (300 MHz, D2O)δ 1.51 (m, 4 H), 1.62 (m, 8 H), 3.00 (t, 8 H, J=6 Hz), 3.51 (s, 3 H), 3.63 (s, 3 H), 3.67 (s, 3 H), 6.34 (d, 1 H, J=12.6 Hz), 6.51 (d, 1 H, J=12.6 Hz), 6.72 (s, 2 H), 6.83 (s, 1 H) and 7.21 (s, 1 H).
Glycine-OMe 3-iodo-4,4′,5-trimethoxy-Z-stilbene 3′-O-phosphate.
Obtained as a colorless solid: mp 74–78° C.; 1H-NMR (300 MHz, D2O)δ 3.48 (s, 3 H), 3.61 (s, 3 H), 3.67 (s, 3 H), 3.68 (s, 3 H), 3.76 (s, 2 H), 6.30 (d, 1 H, J=12 Hz), 6.46 (d, 1 H, J=12 Hz), 6.69–6.77 (m, 3 H), 7.10 (s, 1 H) and 7.16 (s, 1 H).
Tryptophan-OMe 3-iodo-4,4′,5-trimethoxy-Z-stilbene 3′-O-phosphate.
Colorless solid: mp 108–112° C.; 1H-NMR (300 MHz, DMSO)δ 3.19 (d, 2 H, J=6.3 Hz), 3.56 (s, 3 H), 3.61 (s, 3 H), 3.66 (s, 3 H), 3.70 (s, 3 H), 4.09 (t, 1 H, J=6 Hz), 6.35 (d, 1 H, J=12 Hz), 6.47 (d, 1 H, J=12 Hz), 6.81–6.85 (m, 2 H), 6.98 (t, 1 H, J=7.2 Hz), 7.07 (t, 1 H, J=8.1 Hz), 7.18 (s, 1 H), 7.22 (s, 1 H), 7.34 (d, 1 H, J=8.1 Hz), 7.40 (s, 1 H) and 7.46 (d, 1 H, J=7.2 Hz).
Tris 3-iodo-4,4′,5-trimethoxy-Z-stilbene 3′-O-phosphate.
Colorless solid: mp 75–81° C.; 1H-NMR (300 MHz, DMSO)δ 3.42 (s, 9 H), 3.57 (s, 3 H), 3.67 (s, 3 H), 3.70 (s, 3 H), 6.35 (d, 1 H, J=12 Hz), 6.48 (d, 1 H, J=12 Hz), 6.76 (d, 1 H, J=8.4 Hz), 6.81 (d, 1 H, J=8.7 Hz), 6.92 (s, 1 H), 7.22 (s, 1 H) and 7.42 (s, 1 H).
Potassium 3,5-diiodo-4,4′dimethoxy-Z-stilbene 3′-O-phosphate.
Phosphate (0.20 g, 80%) was obtained from appropriate ester 9c (0.29 g, 0.38 mmol) as described above for the synthesis of 20c, except the phosphoric acid was insoluble in EtOAc and DCM, so the aqueous phase was extracted with butyl alcohol (3×25 mL). The potassium salt was a colorless solid: mp 210–215° C. (dec); 1H-NMR (300 MHz, D2O)δ 3.69 (s, 6 H), 6.27 (d, 1 H, J=12 Hz), 6.49 (d, 1 H, J=12 Hz), 6.64 (s, 2 H), 7.20 (s, 1 H) and 7.62 (s, 2 H); 31P-NMR (162 MHz, D20)δ 0.973.
Sodium 3,5-diiodo-4,4′dimethoxy-Z-stilbene 3′-O-phosphate.
Obtained as a colorless solid: mp 215–234° C. (dec); 1H-NMR (300 MHz, D2O)δ 3.69 (s, 3 H), 3.72 (s, 3 H), 6.29 (d, 1 H, J=12 Hz), 6.49 (d, 1 H, J=12 Hz), 6.69 (s, 2 H), 7.20 (s, 1 H) and 7.64 (s, 2 H).
Lithium 3,5-diiodo-4,4′dimethoxy-Z-stilbene 3′-O-phosphate.
A colorless solid melting at 250–270° C. (dec); 1H-NMR (300 MHz, D2O) δ 3.68 (s, 3 H), 3.71 (s, 3 H), 6.28 (d, 1 H, J=12 Hz), 6.49 (d, 1 H, J=12 Hz), 6.68 (s, 2 H), 7.19 (s, 1 H) and 7.64 (s, 2 H). 31P NMR (162 MHz, D20)δ 0.96.
Morpholine 3,5-diiodo-4,4′dimethoxy-Z-stilbene 3′-O-phosphate.
Colorless waxy solid; mp 75–80° C.; 1H-NMR (300 MHz, DMSO)δ 2.96–2.99 (m, 8 H), 3.74–3.77 (m, 8 H), 3.82 (s, 3 H), 3.83 (s, 3 H), 6.43 (d, 1 H, J=12.5 Hz), 6.60 (d, 1 H, J=12.5 Hz), 6.86 (d, 1 H, J=8.2 Hz), 6.93 (d, 1 H, J=8.2 Hz), 7.49 (s, 1 H) and 7.78 (s, 2 H).
Piperidine 3,5-diiodo-4,4′dimethoxy-Z-stilbene 3′-O-phosphate.
Isolated as a colorless oil; 1H-NMR (300 MHz, DMSO)δ 1.51 (br s, 12 H), 2.79–2.81 (m, 8 H), 3.70 (s, 3 H), 3.72 (s, 3 H), 6.31 (d, 1 H, J=12 Hz), 6.49 (d, 1 H, J=12 Hz), 6.73 (d, 1 H, J=8.4 Hz), 6.80 (d, 1 H, J=8.4 Hz), 7.40 (s, 1 H) and 7.61 (s, 1 H).
Glycine-OMe 3,5-diiodo-4,4′dimethoxy-Z-stilbene 3′-O-phosphate.
Colorless solid; mp 90–97° C.; 1H-NMR (300 MHz, DMSO)δ 3.61 (s, 4 H), 3.68 (s, 6 H), 3.70 (s, 3 H), 3.72 (s, 3 H), 6.31 (d, 1 H, J=12 Hz), 6.49 (d, 1 H, J=12 Hz), 6.72 (d, 1 H, J=9.6 Hz), 6.80 (d, 1 H, J=8.1 Hz), 7.37 (s, 1 H) and 7.67 (s, 1 H).
Tryptophan-OMe 3,5-diiodo-4,4′dimethoxy-Z-stilbene 3′-O-phosphate.
Collected as a colorless solid; melting at 125–130° C.; 1H-NMR (300 MHz, DMSO)δ 3.34 (d, 1 H, J=6.5 Hz), 3.36 (d, 1 H, J=6.5 Hz), 3.66 (s, 3 H), 3.70 (s, 3 H), 3.72 (s, 3 H), 4.32 (t, 1 H, J=6.5 Hz), 6.31 (d, 1 H, J=12 Hz), 6.48 (d, 1 H, J=12 Hz), 6.78–6.81 (m, 2 H), 7.01 (s, 1 H), 7.05 (t, 1 H, J=7 Hz), 7.13 (t, 1 H, J=7 Hz), 7.39 (d, 1 H, J=7.5 Hz), 7.47 (d, 1 H, J=8 Hz) and 7.60 (s, 1 H).
Tris 3,5-diiodo-4,4′dimethoxy-Z-stilbene 3′-O-phosphate.
Colorless solid; mp 115–120° C.; 1H-NMR (300 MHz, DMSO)δ 3.34 (s, 18 H), 3.69 (s, 3 H), 3.71 (s, 3 H), 6.30 (d, 1 H, J=12 Hz), 6.47 (d, 1 H, J=12 Hz), 6.70 (d, 1 H, J=8.1 Hz), 6.78 (d, 1 H, J=8.1 Hz), 7.37 (s, 1 H) and 7.67 (s, 2 H).
Cancer Cell Line Procedures
Inhibition of human cancer cell growth was assessed using the National Cancer Institute's standard sulforhodamine B assay. After 48 hours, the plates were fixed with trichloracetic acid, stained with sulforhodamine B and read with an automated microplate reader. A growth inhibition of 50% (GI50 or the drug concentration causing a 50% reduction in the net protein increase) was calculated from optical density data with Immunosoft software. Inhibition of the mouse leukemia P388 cells was assessed in a 10% horse serum/Fisher medium solution for 24 hours, followed by a 48 hour incubation with serial dilutions of the compounds. Cell growth inhibition (ED50) was then calculated using a Z1 Beckman/Coulter particle counter.
Tubulin Evaluations: Tubulin polymerization was evaluated by turbidimetry at 35 nm using Beckman DU7400/7500 spectrophotometers as known to one of skill in the art. Varying concentrations of the compound were preincubated with 10 μM. Incubation was for 10 minutes at 37° C.
Antiangiogenesis
HUVEC Procedures
In vitro Matrigel antiangiogenesis assays were implemented according to the Developmental Therapeutics Program NCI/NIH protocols known to one of skill in the art. Matrigel, a basement membrane matrix, was obtained from BD Biosciences. Growth inhibition and cord formation assays were conducted using human umbilical vein endothelial cells obtained from GlycoTech. HUVEC cells were grown in EGM-2 medium.
Cord Formation Assay
An aliquot of sixty microliters was placed in each well of an ice-cold 96-well plate. The plates were then left for 15 minutes at room temperature, then incubated for 30 minutes at 37° C. to permit the matrigel to polymerize. Meanwhile, HUVEC cells were harvested and diluted to a concentration of 2×105 cells/ml. A solution of 100 μL containing the compounds to be tested was added next. After 24 hours incubation, pictures were taken for each concentration using an inverted Nikon Diaphot microscope and D100 digital camera. Drug effect was assessed, compared to untreated controls, by measuring the length of cords formed and number of junctions.
The standard sulforhodamine B assay (see Cancer Cell Line Procedures above) was used to evaluate results using HUVEC cells. IC50 or ED50 (drug concentration causing 50% inhibition) was calculated from the plotted data.
ADMINISTRATION
Dosages
The dosage to be administered to humans and other animals requiring treatment will depend upon the identity of the neoplastic disease or microbial infection; the type of host involved, including its age, health and weight; the kind of concurrent treatment, if any; the frequency of treatment and therapeutic ratio. Hereinafter are described various possible dosages and methods of administration, with the understanding that the following are intended to be illustrative only, and that the actual dosages to be administered, and methods of administration or delivery may vary therefrom. The proper dosages and administration forms and methods may be determined by one of skill in the art.
Illustratively, anticipated dosage levels of the administered active ingredients may be in the following ranges: intravenous, 0.1 to about 200 mg/kg; intramuscular, 1 to about 500 mg/kg; orally, 5 to about 1000 mg/kg; intranasal instillation, 5 to about 1000 mg/kg; and aerosol, 5 to about 1000 mg/k of host body weight.
Expressed in terms of concentration, an active ingredient can be present in the compositions of the present invention for localized use about the cutis, intranasally, pharyngolaryngeally, bronchially, intravaginally, rectally, or ocularly in concentration of from about 0.01 to about 50% w/w of the composition; preferably about 1 to about 20% w/w of the composition; and for parenteral use in a concentration of from about 0.05 to about 50% w/v of the composition and preferably from about 5 to about 20% w/v.
The compositions of the present invention are intended to be presented for administration to humans and animals in unit dosage forms, such as tablets, capsules, pills, powders, granules, suppositories, sterile parenteral solutions or suspensions, sterile non-parenteral solutions of suspensions, and oral solutions or suspensions and the like, containing suitable quantities of an active ingredient. Other dosage forms known in the art may be used.
For oral administration either solid or fluid unit dosage forms may be prepared.
Powders may be prepared by comminuting the active ingredient to a suitably fine size and mixing with a similarly comminuted diluent. The diluent can be an edible carbohydrate material such as lactose or starch. Advantageously, a sweetening agent or sugar is present as well as a flavoring oil.
Capsules may be produced by preparing a powder mixture as hereinbefore described and filling into formed gelatin sheaths. Advantageously, as an adjuvant to the filling operation, a lubricant such as talc, magnesium stearate, calcium stearate and the like is added to the powder mixture before the filling operation.
Soft gelatin capsules may be prepared by machine encapsulation of a slurry of active ingredients with an acceptable vegetable oil, light liquid petrolatum or other inert oil or triglyceride or other pharmaceutically acceptable carrier.
Tablets may be made by preparing a powder mixture, granulating or slugging, adding a lubricant and pressing into tablets. The powder mixture may be prepared by mixing an active ingredient, suitably comminuted, with a diluent or base such as starch, lactose, kaolin, dicalcium phosphate and the like. The powder mixture can be granulated by wetting with a binder such as corn syrup, gelatin solution, methylcellulose solution or acacia mucilage and forcing through a screen. As an alternative to granulating, the powder mixture may be slugged, i.e., run through the tablet machine and the resulting imperfectly formed tablets broken into pieces (slugs). The slugs can be lubricated to prevent sticking to the tablet-forming dies by means of the addition of stearic acid, a stearic salt, talc or mineral oil. The lubricated mixture is then compressed into tablets.
Advantageously, for protection of the tablet itself and/or to ease swallowing, the tablet can be provided with a pharmaceutically acceptable coating such as a sealing coat or enteric coat of shellac, a coating of sugar and methylcellulose and polish coating of carnauba wax.
Fluid unit dosage forms for oral administration such as in syrups, elixirs and suspensions may be prepared wherein each teaspoonful of composition contains a predetermined amount of an active ingredient for administration.
The water-soluble forms may be dissolved in an aqueous vehicle together with sugar, flavoring agents and preservatives to form a syrup. An elixir is prepared by using a hydroalcoholic vehicle with suitable sweeteners together with a flavoring agent. Suspensions may be prepared of the insoluble forms with a suitable vehicle with the aid of a pharmaceutically acceptable suspending agent such as acacia, tragacanth, methylcellulose and the like.
For parenteral administration, fluid unit dosage forms may be prepared utilizing an active ingredient and a sterile vehicle, for example, water. The active ingredient, depending on the form and concentration used, can be either suspended or dissolved in the vehicle. In preparing solutions the water-soluble active ingredient can be dissolved in water for injection and filter sterilized before filling into a suitable vial or ampule and sealing. Advantageously, adjuvants such as a local anesthetic, preservative and buffering agents can be dissolved in the vehicle. Parenteral suspensions may be prepared in substantially the same manner except that an active ingredient is suspended in the vehicle instead of being dissolved and sterilization cannot be accomplished by filtration. The active ingredient may be sterilized by exposure to ethylene oxide before suspending in the sterile vehicle. Advantageously, a pharmaceutically acceptable surfactant or wetting agent may be included in the composition to facilitate uniform distribution of the active ingredient.
In addition to oral and parenteral administration, the rectal and vaginal routes can be utilized. An active ingredient can be administered by means of a suppository. A vehicle which has a melting point at about body temperature or one that is readily soluble can be utilized. For example, cocoa butter and various polyethylene glycols (Carbowaxes) can serve as the vehicle.
For intranasal installation, a fluid unit dosage form may be prepared utilizing an active ingredient and a suitable pharmaceutical vehicle, such as purified water, a dry powder, can be formulated when insufflation is the administration of choice.
For use as aerosols, the active ingredients may be packaged in a pressurized aerosal container together with a gaseous or liquefied propellant, for example, dichlorodifluoromethane, carbon dioxide, nitrogen, propane, and the like, with the usual adjuvants such as cosolvents and wetting agents, as may be necessary or desirable.
The term “unit dosage form” as used in the specification and claims refers to physically discrete units suitable as unitary dosages for human and animal subjects, each unit containing a predetermined quantity of active material calculated to produce the desired therapeutic effect in association with the required pharmaceutical diluent, carrier or vehicle. The specifications for the novel unit dosage forms of this invention are dictated by and are directly dependent on (a) the unique characteristics of the active material and the particular therapeutic effect to be achieved, and (b) the limitation inherent in the art of compounding such an active material for therapeutic use in humans, as disclosed in this specification, these being features of the present invention. Examples of suitable unit dosage forms in accord with this invention are tablets, capsules, troches, suppositories, powder packets, wafers, cachets, teaspoonfuls, tablespoonfuls, dropperfuls, ampules, vials, segregated multiples of any of the foregoing, and other forms as herein described.
The active ingredients to be employed as antineoplastic agents may be prepared in such unit dosage form with the employment of pharmaceutical materials which themselves are available in the art and can be prepared by established procedures. The following preparations are illustrative of the preparation of the unit dosage forms of the present invention, and not as a limitation thereof. Shown in the following are examples of dosage forms for the compounds of the present invention, in which the notation “active ingredient” signifies the compounds described herein.
COMPOSITION “A”
Hard-Gelatin Capsules
One thousand two-piece hard gelatin capsules for oral use, each capsule containing 200 mg of an active ingredient may be prepared from the following types and amounts of ingredients:
















Active ingredient, micronized
200 g



Corn Starch
 20 g



Talc
 20 g



Magnesium stearate
 2 g










The active ingredient, finely divided by means of an air micronizer, is added to the other finely powdered ingredients, mixed thoroughly and then encapsulated in the usual manner.
Using the procedure above, capsules may be similarly prepared containing an active ingredient in 50, 250 and 500 mg amounts by substituting 50 g, 250 g and 500 g of an active ingredient for the 200 g used above.
COMPOSITION “B”
Soft Gelatin Capsules
One-piece soft gelatin capsules for oral use, each containing 200 mg of an active ingredient, finely divided by means of an air micronizer, may prepared by first suspending the compound in 0.5 ml of corn oil to render the material capsulatable and then encapsulating in the above manner.
COMPOSITION “C”
Tablets
One thousand tablets, each containing 200 mg of an active ingredient, may be prepared from the following types and amounts of ingredients:
















Active ingredient, micronized
200 g



Lactose
300 g



Corn starch
 50 g



Magnesium stearate
 4 g



Light liquid petrolatum
 5 g










The active ingredient, finely divided by means of an air micronizer, is added to the other ingredients and then thoroughly mixed and slugged. The slugs are broken down by forcing them through a Number Sixteen screen. The resulting granules are then compressed into tablets, each tablet containing 200 mg of the active ingredient.
Using the procedure above, tablets may similarly prepared containing an active ingredient in 250 mg and 100 mg amounts by substituting 250 g and 100 g of an active ingredient for the 200 g used above.
COMPOSITION “D”
Oral Suspension
One liter of an aqueous suspension for oral use, containing in each teaspoonful (5 ml) dose, 50 mg of an active ingredient, may be prepared from the following types and amounts of ingredients:
















Active ingredient, micronized
 10 g



Citric acid
  2 g



Benzoic acid
  1 g



Sucrose
 790 g



Tragacanth
  5 g



Lemon Oil
  2 g



Deionized water, q.s.
1000 ml










The citric acid, benzoic acid, sucrose, tragacanth and lemon oil are dispersed in sufficient water to make 850 ml of suspension. The active ingredient, finely divided by means of an air micronizer, is stirred into the syrup unit uniformly distributed. Sufficient water is added to make 1000 ml.
COMPOSITION “E”
Parenteral Product
A sterile aqueous suspension for parenteral injection, containing 30 mg of an active ingredient in each milliliter for treating a neoplastic disease, may be prepared from the following types and amounts of ingredients:
















Active ingredient, micronized
  30 g



POLYSORBATE 80
   5 g



Methylparaben
 2.5 g



Propylparaben
 0.17 g



Water for injection, q.s.
 1000 ml.










All the ingredients, except the active ingredient, are dissolved in the water and the solution sterilized by filtration. To the sterile solution is added the sterilized active ingredient, finely divided by means of an air micronizer, and the final suspension is filled into sterile vials and the vials sealed.
COMPOSITION “F”
Suppository, Rectal and Vaginal
One thousand suppositories, each weighing 2.5 g and containing 200 mg of an active ingredient may be prepared from the following types and amounts of ingredients:
















Active ingredient, micronized
  15 g



Propylene glycol
  150 g



Polyethylene glycol #4000, q.s.
2,500 g










The active ingredient is finely divided by means of an air micronizer and added to the propylene glycol and the mixture passed through a colloid mill until uniformly dispersed. The polyethylene glycol is melted and the propylene glycol dispersion is added slowly with stirring. The suspension is poured into unchilled molds at 40° C. The composition is allowed to cool and solidify and then removed from the mold and each suppository foil wrapped.
COMPOSITION “G”
Intranasal Suspension
One liter of a sterile aqueous suspension for intranasal instillation, containing 20 mg of an active ingredient in each milliliter, may be prepared from the following types and amounts of ingredients:
















Active ingredient, micronized
  15 g



POLYSORBATE 80
   5 g



Methylparaben
 2.5 g



Propylparaben
 0.17 g



Deionized water, q.s.
 1000 ml.










All the ingredients, except the active ingredient, are dissolved in the water and the solution sterilized by filtration. To the sterile solution is added the sterilized active ingredient, finely divided by means of an air micronizer, and the final suspension is aseptically filled into sterile containers.
COMPOSITION “H”
Powder
Five grams of active ingredient in bulk form is finely divided by means of an air micronizer. The micronized powder is placed in a shaker-type container.
COMPOSITION “I”
Oral Powder
One hundred grams of an active ingredient in bulk form may be finely divided by means of an air micronizer. The micronized powder is divided into individual doses of 200 mg and packaged.
COMPOSITION “J”
Insulation
One hundred grams of an active ingredient in bulk form is finely divided by means of an air micronizer.
It is of course understood that such modifications, alterations and adaptations as will readily occur to the artisan confronted with this disclosure are intended within the spirit of the present invention.







TABLE I







Human cancer cell line inhibition (GI50 μg/mL) and murine P388 lymphocytic


leukemia inhibitory activity (ED50 μg/ml) of halocombstatins and other compounds.















Leukemia
Pancreas-
Breast adn
CNS
Lung-NSC
Colon
Prostate


Compound
P388
a BXPC-3
MCF-7
SF268
NCI-H460
KM20L2
DU-145

















 1a
0.0003
0.39
—
<0.001
0.0006
0.061
0.0008


 1b
0.0004
—
—
0.036
0.029
0.034
—


 2a
0.251
4.4
—
—
0.74
0.061
0.17


 2b
<0.01
1.5
0.024
0.036
0.038
0.53
0.034


 3a
0.257
2.3
0.49
0.0083
0.19
1.2
0.0043


 3b
0.305
2.8
0.92
0.052
0.45
3.5
0.048


11a
<0.01
0.016
<0.01
<0.01
<0.01
1.1
<0.01


11b
0.253
2.2
0.051
0.35
0.18
0.53
0.18


12a
<0.01
0.043
<0.001
<0.001
<0.001
0.15
<0.001


12b
0.027
0.59
0.041
0.048
0.034
1.4
0.038


13a
<0.01
0.16
<0.001
<0.001
<0.001
0.086
<0.001


13b
0.0174
1.6
0.14
0.18
0.15
1.2
0.13


14a
<0.01
0.11
0.00022
0.00035
0.00019
0.15
0.00052


14b
0.189
2.7
0.18
0.55
0.21
1.7
0.27


18a
0.0298
0.59
0.0044
0.0051
0.0094
1.5
0.0036


19a
<0.01
0.093
0.0041
0.0034
0.0028
0.23
0.0046


19b
<0.01
0.13
0.0039
0.0030
0.0026
0.11
0.0066


19c
<0.01
0.20
0.0035
0.0032
0.0029
0.24
0.0028


19d
<0.01
0.15
0.0044
0.0064
0.0066
0.48
0.0079


19e
<0.01
0.56
0.043
0.023
0.041
2.6
0.042


19f
0.288
<0.001
0.0022
0.0022
0.0068
0.37
0.0063


19g
<0.01
0.074
0.0045
0.0053
0.0039
0.27
0.0045


19h
<0.01
0.17
0.0049
0.0067
0.0047
0.45
0.0049


19i
2.22
>10
3.2
4.1
2.9
>10
2.8


20a
<0.01
0.47
0.012
0.0052
0.0031
0.37
0.0078
















TABLE Ia







Solubilities of some of the synthetic modifications, human cancer cell line growth


inhibition (GI50 μg/mL) and murine P388 lymphocytic leukemia inhibitory activity (ED50 μg/ml).
















Solubilitya
Leukemia
Pancreas
Breast
CNS
Lung-NSC
Colon
Prostate


Compound
(mg/mL)
P388
BXPC-3
MCF-7
SF268
NCI-H460
KM20L2
DU-145


















A
—
0.0003
0.39
—
<0.001
0.0006
0.061
0.0048


B
—
0.0004
—
—
0.036
0.029
0.034
—


C
—
0.26
2.3
0.49
0.0083
0.19
1.2
0.0043


D
—
0.0020
0.745
0.0027
0.0016
0.0032
>1
0.019


E
—
0.0020
0.048
0.00022
0.00018
0.00029
0.328
0.00018


F
—
0.189
2.7
0.18
0.55
0.21
1.7
0.27


G
—
0.0028
0.038
0.0027
0.0036
0.0034
0.15
0.0021


H
—
>10
3.0
0.94
3.3
3.4
>10
5.8


I
—
0.0089
0.040
0.00053
0.0023
0.0032
0.075
0.0020


J
—
0.022
0.080
<0.0001
0.0002
0.00031
0.16
0.00026


K
14
0.0021
0.381
0.0064
0.0057
0.0043
>1
0.0038


L
2
0.0020
0.469
0.018
0.018
0.017
>1
0.011


M
≧2.4
0.017
0.490
0.0038
0.0040
0.0039
>1
0.0043


N
—
0.0032
0.21
0.0047
0.0037
0.0036
0.24
0.0026


O
≧4
0.0026
0.32
0.0065
0.0044
0.0036
0.51
0.0029


P
≧2
0.0026
0.16
0.0044
0.0033
0.0031
0.32
0.0021


Q
—
0.0022
0.26
0.035
0.0097
0.0034
0.59
0.0030


R
—
0.0029
0.37
0.0048
0.0043
0.0040
0.40
0.0047


S
22
0.0034
0.44
0.050
0.053
0.046
>1
0.028


T
2
0.030
>1
0.066
0.051
0.327
>1
0.242


U
≧4
0.021
0.37
0.051
0.050
0.050
>1
0.032


V
—
0.014
0.35
0.066
0.054
0.033
>1
0.028


W
—
0.011
0.33
0.070
0.041
0.025
>1
0.025


X
—
0.011
0.36
0.10
0.054
0.030
>1
0.023


Y
—
0.017
0.37
0.22
0.086
0.033
>1
0.026


Z
—
0.026
0.33
0.047
0.040
0.025
0.94
0.021





aSolubility values were obtained using 1 mL D2O at 25° C.


Key to Table Ia


A = combretastatin A-4


B = sodium combretastatin A-4 phosphate


C = combretastatin A3


D = fluorocombstatin


E = 3-Iodo-4,4′,5-trimethoxy-3′-hydroxy-Z-stilbene


F = 3-Iodo-4,4′,5-trimethoxy-3′-hydroxy-E-stilbene


G = 3,5-diiodo-4,4′-dimethoxy-3′-hydroxy-Z-stilbene


H = 3,5-diiodo-4,4′-dimethoxy-3′-hydroxy-E-stilbene


I = 3,5-diiodo-4,4′-dimethoxy-3′-acetyl-Z-stilbene


J = 3-iodo-4,4′,5-trimethoxy-3′acetyl-Z-stilbene


K = Potassium 3-iodo, 4,4′,5 trimethoxy-Z-stilbene 3′-O-phosphate


L = Sodium 3-iodo-4,4′,5-trimethoxy-Z-stilbene 3′-O-phosphate


M = Lithium 3 iodo-4,4′,5-trimethoxy-Z-stilbene 3′-O-phosphate


N = Morpholine 3-iodo-4,4′,5-trimethoxy-Z-stilbene 3′-O-phosphate


O = Piperidine 3-iodo-4,4′,5-trimethoxy-Z-stilbene 3′-O-phosphate


P = Glycine-O-Me-3-iodo, 4,4′,5-trimethoxy-Z-stilbene-3′-O-phosphate


Q = Tryptophan-O-Me-3-iodo-4,4′,5-trimethoxy-Z-stilbene 3′-O-phosphate


R = Tris-iodo-4,4′,5-trimethoxy-Z-stilbene 3′-O-phosphate


S = Potassium 3,5-diiodo-4,4′ dimethoxy-Z-stilbene 3′-O-phosphate


T = Sodium 3,5-diiodo-4,4′-dimethoxy-Z-stilbene 3′-O-phosphate


U = Lithium 3,5-diiodo-4,4′ dimethoxy-Z-stilbene 3′-O-phosphate


V = Morpholine 3,5-diiodo-4,4′ dimethoxy-Z-stilbene 3′-O-phosphate


W = Piperidine 3,5-diiodo-4,4′ dimethoxy-Z-stilbene 3′-O-phosphate


X = Glycine-O-Me 3,5-diiodo-4,4′ dimethoxy-Z-stilbene 3′-O-phosphate


Y = Tryptophan-OMe-3,5-diiodo-4,4′ dimethoxy-Z-stilbene 3′-O-phosphate


Z = Tris 3,5 diiodo-4,4′ dimethoxy-Z-stilbene 3′-O-phosphate













TABLE II







Inhibition of tubulin polymerization and binding of [3H]colchicine


to tubulin by halocombstatins











Inhibition of



Inhibition of polymerization
colchicine binding


Compound
IC50 (μM) ± S.D.
% inhibition ± S.D.





 1a
1.8 ± 0.2
81 ± 3


11a
1.5 ± 0.2
75 ± 6


12a
1.6 ± 0.3
85 ± 4


13a
1.5 ± 0.2
89 ± 2


14a
1.6 ± 0.2
84 ± 7
















TABLE III







Antimicrobial activities of halocombstatins and other compounds









Range of minimum inhibitory concentration (μg/ml)



Compound
















Microorganism
11a
11b
12a
14a
14b
13a
13b
18a
20a





Cryptococcus neoformans
64
64
64
32–64
64
*
*
*
*


Candida albicans
*
*
*
*
*
*
*
*
*


Staphylococcus aureus
*
32–64
*
*
8–64
*
*
*
*


Streptococcus pneumoniae
64
64
32–64
64
*
*
*
*
*


Enterococcus faecalis
*
*
*
*
*
*
*
*
*


Micrococcus luteus
32–64
16–32
32
16–32
4–8 
32–64
*
*
*


Escherichia coli
*
*
*
*
*
*
*
*
*


Enterobacter cloacae
*
*
*
*
*
*
*
*
*


Stenotrophomonas
*
*
*
*
*
*
*
*
*


maltophilia


Neisseria gonorrhoeae
32
 8–16
16
16–32
4–16
32–64
*
16
16–32





* = no inhibition at 64 μg/ml













TABLE IV







Human Anaplastic Thyroid Carcinoma Cell Line Inhibition Values


(GI50) expressed in μg/mL.









Compound
KAT-4
SW1736












3-Iodo-4,4′,5-trimethoxy-3′-
0.089–0.14 
2.2


hydroxy-Z-stilbene


3,5-diiodo-4,4′-dimethoxy-
0.039–0.063
1.2


3′-hydroxy-Z-stilbene


Potassium 3-iodo-4,4′,5-trimethoxy-
0.37–0.43
>10


Z-stilbene 3′-O-phosphate


Potassium 3,5-diiodo-4,4′dimethoxy-
0.38–0.44
>10


Z-stilbene 3′-O-phosphate
















TABLE V







Human Umbilical Vein Endothelial Cell (HUVEC)


Inhibition Values (GI50) expressed in μg/mL.








Compound
HUVEC











3-Iodo-4,4′,5-trimethoxy-3′hydroxyl-Z-stilbene
0.000040


3,5-diiodo-4,4′-dimethoxy-3′-hydroxy-Z-stilbene
0.00028


Potassium 3-iodo-4,4′,5-trimethoxy-Z-stilbene 3′-O-phosphate
0.00025


Sodium 3-iodo-4,4′,5-trimethoxy-Z-stilbene 3′-O-phosphate
0.00035


Potassium 3,5-diiodo-4,4′dimethoxy-Z-stilbene 3′-O-phosphate
0.0049


Sodium 3,5-diiodo-4,4′dimethoxy-Z-stilbenes 3′-O-phosphate
0.051
















TABLE VI







Length of Cords Formed, Number of Junctions


and Relative Percent Growth













Lengths

Relative



Drug
of
Number of
%



concentration
Cords
junctions
Growth














3-Iodo-4,4′,5-trimethoxy-
  0.01 μg/ml
−
−
14


3′-hydroxy-Z-stilbene
 0.001 μg/ml
+
+
14



 0.0001 μg/ml
++(+)
++(+)
18



0.00001 μg/ml


90


3,5-diiodo-4,
  0.01 μg/ml
−
−
4


4′dimethoxy-
 0.001 μg/ml
+
(+)
8


3′-hydroxy-Z-stilbene
 0.0001 μg/ml
+++
+++
84



0.00001 μg/ml


87


Potassium 3-iodo-4,4′,5-
  0.01 μg/ml


1


trimethoxy-Z-stilbene-
 0.001 μg/ml
++
++(+)
10


3′-O-phosphate
 0.0001 μg/ml
+++
+++
77



0.00001 μg/ml
+++
+++
95


Sodium 3-iodo-4,4′,5-
  0.1 μg/ml
−
−
7


trimethoxy-Z-stilbene-
  0.01 μg/ml
−
−
14


3′-O-phosphate
 0.001 μg/ml
+
+
5



 0.0001 μg/ml


104


Potassium 3,5-diiodo-
  0.1 μg/ml
−
−
15


4,4′dimethoxy-Z-
  0.01 μg/ml
++(+)
++(+)
33


stilbene 3′-O-phosphate
 0.001 μg/ml
+++
+++
88



 0.0001 μg/ml


96


Sodium 3,5-diiodo-4,4′-
    1 μg/ml
−
−
−7


dimethoxy-Z-stilbene 3′-
  0.1 μg/ml
+
(+)
−2


O-phosphate
  0.01 μg/ml
++(+)
++(+)
>100



 0.0001 μg/ml


>100













Lengths of
Number of


Legend
Cords
junctions


−
No Cords
No




Junctions


+
Small
Few


++
~50% of
~50% of



Control
Control


+++
Same as Control
Same as Control













TABLE VII





Antimicrobial activities of iodocomstatins


















ATCC




or
Range of MIC (μg/ml)



(Presque
Compound




















Microorganism
Isle)#
A
B
C
D
E
F
G
H
I
J
K
L





Cryptococcus
90112
*
64
*
*
*
*
*
*
*
*
*
*


neoformans


Candida
90028
*
*
*
*
*
*
*
*
*
*
*
*


albicans


Staphylococcus
29213
*
*
*
*
*
*
*
*
*
*
*
*


aureus


Streptococcus
6303
*
*
*
*
*
*
*
*
*
*
*
*


pneumoniae


Enterococcus
29212
*
*
*
*
*
*
*
*
*
*
*
*


faecalis


Micrococcus
  (456)
*
*
4–16
2–4
*
*
*
*
*
*
*
*


luteus


Escherichia
25922
*
*
*
*
*
*
*
*
*
*
*
*


coli


Enterobacter
13047
*
*
*
*
*
*
*
*
*
*
*
*


cloacae


Stenotrophomonas
13637
*
*
*
*
*
*
*
*
*
*
*
*


maltophilia


Neisseria
49226
64
*
*
*
*
*
*
*
16–32
*
*
4–8


gonorrhoeae












Range of MIC (μg/ml)



Compound
















Microorganism
M
N
O
P
Q
R
S
T
U





Cryptococcus
*
*
*
*
*
*
*
*
*


neoformans


Candida
*
*
*
*
*
*
*
*
*


albicans


Staphylococcus
*
*
*
*
*
*
*
*
*


aureus


Streptococcus
*
*
*
*
*
*
*
*
*


pneumoniae


Enterococcus
*
*
*
*
*
*
*
*
*


faecalis


Micrococcus
*
*
*
*
*
*
*
*
*


luteus


Escherichia
*
*
*
*
*
*
*
*
*


coli


Enterobacter
*
*
*
*
*
*
*
*
*


cloacae


Stenotrophomonas
*
*
*
*
*
*
*
*
*


maltophilia


Neisseria
32–64
<0.5–4
32–64
<0.5–2
<0.5
<0.5
<0.5–1
<0.5
<0.5–2


gonorrhoeae





Key for Table VII


B 3-iodo-4,4′5-trimethoxy-3′-hydroxy-Z-stilbene


C 3,5-diiodo-4,4′-dimethoxy-3′ hydroxy-Z-stilbene


D 3,5-diiodo-4,4′-dimethoxy-3′ hydroxy-E-stilbene


E 3,5-diiodo-4,4′-dimethoxy-3′-acetyl-Z-stilbene


F Potassium 3 iodo-4,4′5-trimethoxy-Z-stilbene 3′-O-phosphate


G Sodium 3 iodo-4,4′,5 trimethoxy-Z-stilbene-3′-O-phosphate


H Lithium-3-iodo-4,4′5 trimethoxy-Z-stilbene 3′O-phosphate


I Morpholine 3 iodo-4,4′5-trimethoxy-Z-stilbene-3′-O phosphate


J Piperidene 3-iodo-4,4′,5-trimethoxy-Z-stilbene-3′O phosphate


K Glycine-O-Me-3-iodo-4,4′,5-trimethoxy-Z-stilbene-3′-O-phosphate


L Tryptophan-O-Me-3′-iodo-4,4′,5 trimethoxy-Z-stilbene 3′-O-phosphate


M Tris-3-iodo-4,4′,5-trimethoxy-Z-stilbene 3′-O-phosphate


N Potassium 3,5 diiodo-4,4′ dimethoxy-Z-stilbene 3′-O-phosphate


O Sodium 3,5-diiodo-4,4′ dimethoxy-Z-stilbene 3′-O-phosphate


P Lithium 3,5-diiodo-4, 4′ dimethoxy-Z-stilbene 3′O phosphate


Q Morpholine 3,5 diiodo-4,4′ dimethoxy-Z-stilbene 3-O-phosphate


R Piperdine 3,5 diiodo-4,4′ dimethoxy-Z-stilbene 3′O-phosphate


S Glycine O Me 3,5-diiodo-4,4′ dimethoxy-Z-stilbene-3′-O-phosphate


T Tryptophan-O Me 3,5 diiodo 4,4′ dimethoxy-Z-stilbene-3′-O-phosphate


U Tris 3,5-diodo-4,4′ methoxy-Z-stilbene 3′O-phosphate

## Claims

1. A compound having a structure as follows:



wherein X is F, Cl, Br or I.

2. A compound having a structure as follows:



wherein X is F, Cl, Br or I, and R is a metal cation such as Na, Li, K, Cs, Rb, Ca, Mg or is morpholine, piperidine, glycine-OCH3, tryptophan-OCH3 or NH(CH2OH)3.

3. A compound having a structure as follows:



wherein X is F, Cl, Br or I, and Z is a metal cation such as Na, Li, K, Cs, Rb, Ca, Mg or is morpholine, piperidine, glycine-OCH3, tryptophan-OCH3 or NH(CH2OH)3.

4. The compound of claim 1 wherein X=F and the compound is in the Z configuration.

5. The compound of claim 1 wherein X=I and the compound is in the Z configuration.

6. The compound of claim 2 wherein X=F.

7. The compound of claim 2 wherein X=I.

8. The compound of claim 3 wherein X=I.

9. A method for treating cancer, wherein the cancer is selected from the group consisting of thyroid, leukemia, pancreatic, breast, CNS, lung, colon and prostate cancers, comprising administering to a human or mammal an effective amount of a compound of claim 1.

10. A method for treating cancer, wherein the cancer is selected from the group consisting of thyroid, leukemia, pancreatic, breast, CNS, lung, colon and prostate cancers, comprising administering to a human or mammal an effective amount of a compound of claim 2.

11. A method for treating cancer, wherein the cancer is selected from the group consisting of thyroid, leukemia, pancreatic, breast, CNS, lung, colon and prostate cancers, comprising administering to a human or mammal an effective amount of a compound of claim 3.

12. The method of claim 9 wherein the cancer is thyroid cancer and in the compound X=I.

13. The method of claim 10 wherein the cancer is thyroid cancer and in the compound X=I.

14. The method of claim 11 wherein the cancer is thyroid cancer and in the compound X=I.

15. A pharmaceutical composition comprising a compound of claim 1 and a pharmaceutically acceptable carrier therefor.

16. A pharmaceutical composition comprising a compound of claim 2 and a pharmaceutically acceptable carrier therefor.

17. A pharmaceutical composition comprising a compound of claim 3 and a pharmaceutically acceptable carrier therefor.