51
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Blankson G, Rzuczek SG, Bishop C, Pilch DS, Liu A, Liu L, Lavoie EJ, Rice JE. Macrocyclic pyridyl polyoxazoles: structure-activity studies of the aminoalkyl side-chain on G-quadruplex stabilization and cytotoxic activity. Molecules 2013; 18:11938-63. [PMID: 24077174 PMCID: PMC3949622 DOI: 10.3390/molecules181011938] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2013] [Revised: 09/10/2013] [Accepted: 09/17/2013] [Indexed: 11/16/2022] Open
Abstract
Pyridyl polyoxazoles are 24-membered macrocyclic lactams comprised of a pyridine, four oxazoles and a phenyl ring. A derivative having a 2-(dimethylamino)ethyl chain attached to the 5-position of the phenyl ring was recently identified as a selective G-quadruplex stabilizer with excellent cytotoxic activity, and good in vivo anticancer activity against a human breast cancer xenograft in mice. Here we detail the synthesis of eight new dimethylamino-substituted pyridyl polyoxazoles in which the point of attachment to the macrocycle, as well as the distance between the amine and the macrocycle are varied. Each compound was evaluated for selective G-quadruplex stabilization and cytotoxic activity. The more active analogs have the amine either directly attached to, or separated from the phenyl ring by two methylene groups. There is a correlation between those macrocycles that are effective ligands for the stabilization of G-quadruplex DNA (DT(tran) 15.5-24.6 °C) and cytotoxicity as observed in the human tumor cell lines, RPMI 8402 (IC₅₀ 0.06-0.50 μM) and KB3-1 (IC₅₀ 0.03-0.07 μM). These are highly selective G-quadruplex stabilizers, which should prove especially useful for evaluating both in vitro and in vivo mechanism(s) of biological activity associated with G-quaqdruplex ligands.
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Affiliation(s)
- Gifty Blankson
- Department of Medicinal Chemistry, Ernest Mario School of Pharmacy, Rutgers-The State University of New Jersey, 160 Frelinghuysen Road, Piscataway, NJ 08854, USA.
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52
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Xue WJ, Zhang W, Zheng KL, Dai Y, Guo YQ, Li HZ, Gao FF, Wu AX. Formation of 2-Acyloxazoles by a Multipathway Coupled Domino Strategy: One-Pot Metal-Free Oxidative Cyclization Applicable to Various Substrates. ASIAN J ORG CHEM 2013. [DOI: 10.1002/ajoc.201300124] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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53
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Banala S, Ensle P, Süssmuth RD. Die Totalsynthese des ribosomal synthetisierten Peptids Plantazolicin A, eines linearen Azolpeptids vonBacillus amyloliquefaciens. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201302266] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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54
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Banala S, Ensle P, Süssmuth RD. Total synthesis of the ribosomally synthesized linear azole-containing peptide plantazolicin A from Bacillus amyloliquefaciens. Angew Chem Int Ed Engl 2013; 52:9518-23. [PMID: 23761292 DOI: 10.1002/anie.201302266] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2013] [Indexed: 11/06/2022]
Affiliation(s)
- Srinivas Banala
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 124, 10623 Berlin, Germany
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55
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Loos P, Ronco C, Riedrich M, Arndt HD. Unified Azoline and Azole Syntheses by Optimized Aza-Wittig Chemistry. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300160] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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56
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Yugandar S, Acharya A, Ila H. Synthesis of 2,5-Bis(hetero)aryl 4′-Substituted 4,5′-Bisoxazoles via Copper(I)-Catalyzed Domino Reactions of Activated Methylene Isocyanides with 2-Phenyl- and 2-(2-Thienyl)-4-[(aryl/heteroaryl)(methylthio)methylene]oxazol-5(4H)-ones. J Org Chem 2013; 78:3948-60. [DOI: 10.1021/jo400317g] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Somaraju Yugandar
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur,
Bangalore-50064, India
| | - Anand Acharya
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur,
Bangalore-50064, India
| | - Hiriyakkanavar Ila
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur,
Bangalore-50064, India
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57
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Tsai YL, Fan YS, Lee CJ, Huang CH, Das U, Lin W. An efficient synthesis of trisubstituted oxazoles via chemoselective O-acylations and intramolecular Wittig reactions. Chem Commun (Camb) 2013; 49:10266-8. [DOI: 10.1039/c3cc45883k] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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58
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Metal-free dual sp3 C–H functionalization: I2-promoted domino oxidative cyclization to construct 2,5-disubstituted oxazoles. Tetrahedron 2013. [DOI: 10.1016/j.tet.2012.10.072] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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59
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Luo Y, Ji K, Li Y, Zhang L. Tempering the reactivities of postulated α-oxo gold carbenes using bidentate ligands: implication of tricoordinated gold intermediates and the development of an expedient bimolecular assembly of 2,4-disubstituted oxazoles. J Am Chem Soc 2012; 134:17412-5. [PMID: 23039251 PMCID: PMC3495072 DOI: 10.1021/ja307948m] [Citation(s) in RCA: 189] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
2,4-Oxazole is an important structural motif in various natural products. An efficient modular synthesis of this structure has been achieved via a [3 + 2] annulation between a terminal alkyne and a carboxamide using a gold-catalyzed oxidation strategy. The postulated reactive intermediate, a terminal α-oxo gold carbene, previously known to be highly electrophilic and hence unlikely to be trapped by stoichiometric external nucleophiles, is coerced to react smoothly with the carboxamide en route to the oxazole ring by a P,N- or P,S-bidentate ligand such as Mor-DalPhos; in stark contrast, often-used ligands such as monodentate phosphines and N-heterocyclic carbenes are totally ineffective. The role of these bidentate phosphines in this reaction is attributed to the formation of a tricoordinated gold carbene intermediate, which is less electrophilic and hence more chemoselective when reacting with nucleophiles. The success in using bidentate phosphine ligands to temper the reactivities of in situ-generated gold carbenes is likely to open many new opportunities to apply oxidative gold catalysis to the development of novel methods, and the implication of tricoordinated gold intermediates in homogeneous gold catalysis should stimulate further advances in gold catalysis.
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Affiliation(s)
- Yingdong Luo
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106
| | - Kegong Ji
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106
| | - Yuxue Li
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Ling Ling Road 345, Shanghai 200032, China
| | - Liming Zhang
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106
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60
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Xu Z, Zhang C, Jiao N. Synthesis of Oxazoles through Copper-Mediated Aerobic Oxidative Dehydrogenative Annulation and Oxygenation of Aldehydes and Amines. Angew Chem Int Ed Engl 2012; 51:11367-70. [DOI: 10.1002/anie.201206382] [Citation(s) in RCA: 104] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2012] [Indexed: 02/06/2023]
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61
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Xu Z, Zhang C, Jiao N. Synthesis of Oxazoles through Copper-Mediated Aerobic Oxidative Dehydrogenative Annulation and Oxygenation of Aldehydes and Amines. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201206382] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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62
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Enck S, Tremmel P, Eckhardt S, Marsch M, Geyer A. Stereoselective synthesis of highly functionalized thiopeptide thiazole fragments from uronic acid/cysteine condensation products: access to the core dipeptide of the thiazomycins and nocathiacins. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.06.022] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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63
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Barbier J, Wegner J, Benson S, Gentzsch J, Pietschmann T, Kirschning A. Total Synthesis of a Noricumazole A Library and Evaluation of HCV Inhibition. Chemistry 2012; 18:9083-90. [DOI: 10.1002/chem.201104042] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2011] [Indexed: 11/08/2022]
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64
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Zhou Q, Chu X, Tang W, Lu T. An efficient one-pot synthesis of 1,4-disubstituted 3-amino-2-pyridone derivatives via three-component reactions of alkynyl aldehydes and amines with ethyl 2-((diphenylmethylene)amino)acetate. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.03.106] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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65
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Dawsey AC, Li V, Hamilton KC, Wang J, Williams TJ. Copper-catalyzed oxidation of azolines to azoles. Dalton Trans 2012; 41:7994-8002. [PMID: 22460353 DOI: 10.1039/c2dt00025c] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report herein convenient, aerobic conditions for the oxidation of thiazolines to thiazoles and data regarding the oxidation mechanism. These reactions feature operationally simple and environmentally benign conditions and proceed in good yield to afford the corresponding azoles, thus enabling the inexpensive preparation of valuable molecular building blocks. Incorporation of a novel diimine-ligated copper catalyst, [((Mes)DAB(Me))Cu(II)(OH(2))(3)](2+) [(-)OTf](2), provides increased reaction efficiency in many cases. In other cases copper-free conditions involving a stoichiometric quantity of base affords superior results.
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Affiliation(s)
- Anna C Dawsey
- University of Southern California, 837 Bloom Walk, Los Angeles, California 90089-1661, USA
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66
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67
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Moraski GC, Markley LD, Chang M, Cho S, Franzblau SG, Hwang CH, Boshoff H, Miller MJ. Generation and exploration of new classes of antitubercular agents: The optimization of oxazolines, oxazoles, thiazolines, thiazoles to imidazo[1,2-a]pyridines and isomeric 5,6-fused scaffolds. Bioorg Med Chem 2012; 20:2214-20. [PMID: 22391032 DOI: 10.1016/j.bmc.2012.02.025] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2011] [Revised: 02/03/2012] [Accepted: 02/08/2012] [Indexed: 11/30/2022]
Abstract
Tuberculosis (TB) is a devastating disease resulting in a death every 20s. Thus, new drugs are urgently needed. Herein we report ten classes of compounds-oxazoline, oxazole, thiazoline, thiazole, pyrazole, pyridine, isoxazole, imidazo[1,2-a]pyridine, imidazo[1,2-a]pyrimidine and imidazo[1,2-c]pyrimidine-which have good (micromolar) to excellent (sub-micromolar) antitubercular potency. The 5,6-fused heteroaromatic compounds were the most potent with MIC's as low as <0.195 μM (9 and 11). Overall, the imidazo[1,2-a]pyridine class was determined to be most promising, with potency similar to isoniazid and PA-824 against replicating Mtb H(37)Rv, clinically relevant drug sensitive, multi- and extensively resistant Mtb strains as well as having good in vitro metabolic stability.
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Affiliation(s)
- Garrett C Moraski
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46656, USA
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68
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Nagasawa K, Iida K, Majima S, Ohtake T, Tera M, Shin-ya K. Design and Synthesis of G-Quadruplex Ligands Bearing Macrocyclic Hexaoxazoles with Four-Way Side Chains. HETEROCYCLES 2012. [DOI: 10.3987/com-11-s(p)88] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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69
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Xue WJ, Li Q, Zhu YP, Wang JG, Wu AX. Convergent integration of two self-labor domino sequences: a novel method for the synthesis of oxazole derivatives from methyl ketones and benzoins. Chem Commun (Camb) 2012; 48:3485-7. [DOI: 10.1039/c2cc18077d] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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70
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Wang Y, Li Z, Huang Y, Tang C, Wu X, Xu J, Yao H. Copper(II)-catalyzed oxidation of 4-carboxythiazolines and 4-carboxyoxazolines to 4-carboxythiazoles and 4-carboxyoxazoles. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.07.016] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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71
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Reddy DN, Thirupathi R, Prabhakaran EN. Accessing the disallowed conformations of peptides employing amide-to-imidate modification. Chem Commun (Camb) 2011; 47:9417-9. [PMID: 21773612 DOI: 10.1039/c1cc13515e] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Selective modification of the C-terminal amide in peptides to dihydrooxazine (a novel stable imidate isostere) by intramolecular nucleophilic cyclo-O-alkylation of the corresponding N-(3-bromopropyl)amides results in constraining of the C-terminal residue in natively disallowed conformations both in crystals and in solution.
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Affiliation(s)
- Damodara N Reddy
- Department of Organic Chemistry, Indian Institute of Science, CV Raman Avenue, Bangalore, India 560012
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72
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Lu Y, Li CM, Wang Z, Chen J, Mohler ML, Li W, Dalton JT, Miller DD. Design, synthesis, and SAR studies of 4-substituted methoxylbenzoyl-aryl-thiazoles analogues as potent and orally bioavailable anticancer agents. J Med Chem 2011; 54:4678-93. [PMID: 21557538 DOI: 10.1021/jm2003427] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In a continued effort to improve upon the previously published 4-substituted methoxybenzoyl-aryl-thiazole (SMART) template, we explored chemodiverse "B" rings and "B" to "C" ring linkage. Further, to overcome the poor aqueous solubility of this series of agents, we introduced polar and ionizable hydrophilic groups to obtain water-soluble compounds. For instance, based on in vivo pharmacokinetic (PK) studies, an orally bioavailable phenyl-amino-thiazole (PAT) template was designed and synthesized in which an amino linkage was inserted between "A" and "B" rings of compound 1. The PAT template maintained nanomolar (nM) range potency against cancer cell lines via inhibiting tubulin polymerization and was not susceptible to P-glycoprotein mediated multidrug resistance in vitro, and markedly improved solubility and bioavailability compared with the SMART template (45a-c (PAT) vs 1 (SMART)).
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Affiliation(s)
- Yan Lu
- Department of Pharmaceutical Sciences, University of Tennessee, Health Science Center, Memphis, Tennessee 38163, United States
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73
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Nagle PS, Pawar YA, Sonawane AE, Bhosale SM, More DH. Synthesis and evaluation of antioxidant and antimicrobial properties of thymol containing pyridone moieties. Med Chem Res 2011. [DOI: 10.1007/s00044-011-9656-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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74
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Abstract
Hoiamide C was synthesized in 16 steps with an overall yield of 1.8% starting from homoallylic alcohol 18, unambiguously confirming its structure.
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Affiliation(s)
- Lei Wang
- Laboratory of Chemical Genomics, Peking University Shenzhen Graduate School, University Town of Shenzhen, Xili, Nanshan District, Shenzhen, China
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75
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Huang Y, Ni L, Gan H, He Y, Xu J, Wu X, Yao H. Environmental-benign oxidation of 2-oxazolines to oxazoles by dioxygen as the sole oxidant. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.01.050] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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76
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Synthesis of gemini triethylene-tetramine bridged bis-tridentate iron(III) chelators. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.01.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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77
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Tera M, Iida K, Shin-ya K, Nagasawa K. Development of Macrocyclic Polyoxazoles and Evaluation of Their G-Quadruplex Stabilizing Activities. J SYN ORG CHEM JPN 2011. [DOI: 10.5059/yukigoseikyokaishi.69.129] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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78
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Xu G, Luo Q, Eibauer S, Rausch AF, Stempfhuber S, Zabel M, Yersin H, Reiser O. Palladium(ii)- and platinum(ii)phenyl-2,6-bis(oxazole) pincer complexes: Syntheses, crystal structures, and photophysical properties. Dalton Trans 2011; 40:8800-6. [DOI: 10.1039/c1dt10369e] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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79
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Carlson LJ, Welby J, Zebrowski KA, Wilk MM, Giroux R, Ciancio N, Tanski JM, Bradley A, Tyler LA. Spectroscopic differences between heterocyclic benzothiazoline, -thiazole and imine containing ligands and comparison of the Co and Cu pyridine benzothiazole and imine complexes. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2010.09.002] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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80
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Studies directed toward the synthesis of rhizopodin: stereoselective synthesis of the C1–C15 fragment. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.09.144] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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81
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Abstract
An expedient method for the direct conversion of aldehydes to 2,4-disubstituted oxazoles is presented. The method relies on the oxidation of an oxazolidine formed from the condensation of serine with an aldehyde and proceeds through a 2,5-dihydrooxazole intermediate. In contrast to standard methods that start from carboxylic acids, the use of aldehydes as starting materials does not require intermediate purification and affords the oxazoles under relatively mild conditions.
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Affiliation(s)
- Thomas H Graham
- Merck Research Laboratories, Merck & Co., Inc., P.O. Box 2000, Rahway, New Jersey 07065-0900, USA.
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82
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Chen J, Wang Z, Li CM, Lu Y, Vaddady PK, Meibohm B, Dalton JT, Miller DD, Li W. Discovery of novel 2-aryl-4-benzoyl-imidazoles targeting the colchicines binding site in tubulin as potential anticancer agents. J Med Chem 2010; 53:7414-27. [PMID: 20919720 DOI: 10.1021/jm100884b] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A series of 2-aryl-4-benzoyl-imidazoles (ABI) was synthesized as a result of structural modifications based on the previous set of 2-aryl-imidazole-4-carboxylic amide (AICA) derivatives and 4-substituted methoxylbenzoyl-aryl-thiazoles (SMART). The average IC(50) of the most active compound (5da) was 15.7 nM. ABI analogues have substantially improved aqueous solubility (48.9 μg/mL for 5ga vs 0.909 μg/mL for SMART-1, 0.137 μg/mL for paclitaxel, and 1.04 μg/mL for combretastatin A4). Mechanism of action studies indicate that the anticancer activity of ABI analogues is through inhibition of tubulin polymerization by interacting with the colchicine binding site. Unlike paclitaxel and colchicine, the ABI compounds were equally potent against multidrug resistant cancer cells and the sensitive parental melanoma cancer cells. In vivo results indicated that 5cb was more effective than DTIC in inhibiting melanoma xenograph tumor growth. Our results suggest that the novel ABI compounds may be developed to effectively treat drug-resistant tumors.
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Affiliation(s)
- Jianjun Chen
- Department of Pharmaceutical Sciences, University of Tennessee Health Science Center, Memphis, Tennessee 38163, United States
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83
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Xie H, Zhu J, Chen Z, Li S, Wu Y. Diastereoselective Silver-Catalyzed 1,3-Dipolar Cycloaddition of Azomethine Ylides with Fluorinated Imine. J Org Chem 2010; 75:7468-71. [DOI: 10.1021/jo101447n] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Haibo Xie
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Jiangtao Zhu
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Zixian Chen
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
- Department of Chemistry, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - Shan Li
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Yongming Wu
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
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84
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Kita M, Watanabe H, Ishitsuka T, Mogi Y, Kigoshi H. Synthetic studies of mycalolide B, an actin-depolymerizing marine macrolide: construction of the tris-oxazole macrolactone using ring-closing metathesis. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.07.046] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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85
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Chen Z, Song L, Xu Z, Ye T. Synthesis of the C9-C23 (C9'-C23') fragment of the dimeric natural product rhizopodin. Org Lett 2010; 12:2036-9. [PMID: 20380407 DOI: 10.1021/ol100515m] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A stereoselective assembly of the C9-C23 (C9'-C23') fragment of rhizopodin, a 38-membered bis-lactone natural product, has been developed. A highly efficient approach to this fragment assembles >50% of the carbon skeleton and the stereochemical elements present in the natural product.
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Affiliation(s)
- Zheng Chen
- Laboratory of Chemical Genomics, Peking University Shenzhen Graduate School, University Town of Shenzhen, Xili, Nanshan District, Shenzhen, China
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86
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Misra NC, Ila H. 4-Bis(methylthio)methylene-2-phenyloxazol-5-one: Versatile Template for Synthesis of 2-Phenyl-4,5-functionalized Oxazoles. J Org Chem 2010; 75:5195-202. [DOI: 10.1021/jo100941f] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nimesh C. Misra
- Department of Chemistry, Indian Institute of Technology, Kanpur-208 016, India
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore-560 064, India
| | - H. Ila
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore-560 064, India
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87
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Murai K, Takahara Y, Matsushita T, Komatsu H, Fujioka H. Facile Preparation of Oxazole-4-carboxylates and 4-Ketones from Aldehydes using 3-Oxazoline-4-carboxylates as Intermediates. Org Lett 2010; 12:3456-9. [DOI: 10.1021/ol1012789] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kenichi Murai
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Yusuke Takahara
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Tomoyo Matsushita
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Hideyuki Komatsu
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Hiromichi Fujioka
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka 565-0871, Japan
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88
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Rzuczek SG, Pilch DS, Liu A, Liu L, LaVoie EJ, Rice JE. Macrocyclic pyridyl polyoxazoles: selective RNA and DNA G-quadruplex ligands as antitumor agents. J Med Chem 2010; 53:3632-44. [PMID: 20359224 DOI: 10.1021/jm1000612] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The synthesis of a series of 24-membered pyridine-containing polyoxazole macrocycles is described. Seventeen new macrocycles were evaluated for cytotoxic activity against RPMI 8402, KB-3, and KB-3 cell lines that overexpress the efflux transporters MDR1 (KBV-1) and BCRP (KBH5.0). Macrocycles in which the pyridyl-polyoxazole moiety is linked by a 1,3-bis(aminomethyl)phenyl group with a 5-(2-aminoethyl)- (18) or a 5-(2-dimethylaminoethyl)- substituent (19) displayed the greatest cytotoxic potency. These compounds exhibit exquisite selectivity for stabilizing G-quadruplex DNA with no stabilization of duplex DNA or RNA. Compound 19 stabilizes quadruplex mRNA that encodes the cell-cycle checkpoint protein kinase Aurora A to a greater extent than the quadruplex DNA of a human telomeric sequence. These data may suggest a role for G-quadruplex ligands interacting with mRNA being associated with the biological activity of macrocyclic polyoxazoles. Compound 19 has significant in vivo anticancer activity against a human breast cancer xenograft (MDA-MB-435) in athymic nude mice.
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Affiliation(s)
- Suzanne G Rzuczek
- Department of Medicinal Chemistry, Ernest Mario School of Pharmacy, Rutgers-The State University of New Jersey, 160 Frelinghuysen Road, Piscataway, New Jersey 08854-8020, USA
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89
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Moraski GC, Chang M, Villegas-Estrada A, Franzblau SG, Möllmann U, Miller MJ. Structure–activity relationship of new anti-tuberculosis agents derived from oxazoline and oxazole benzyl esters. Eur J Med Chem 2010. [DOI: 10.1016/j.ejmech.2009.12.074 pmid: 20116900] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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90
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Moraski GC, Chang M, Villegas-Estrada A, Franzblau SG, Möllmann U, Miller MJ. Structure-activity relationship of new anti-tuberculosis agents derived from oxazoline and oxazole benzyl esters. Eur J Med Chem 2010; 45:1703-16. [PMID: 20116900 PMCID: PMC2843756 DOI: 10.1016/j.ejmech.2009.12.074] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2009] [Revised: 12/21/2009] [Accepted: 12/23/2009] [Indexed: 11/29/2022]
Abstract
During the syntheses and studies of natural iron chelators (mycobactins), we serendipitously discovered that a simple, small molecule, oxazoline-containing intermediate 3 displayed surprising anti-tuberculosis activity (MIC of 7.7 microM, average). Herein we report elaboration of SAR around this hit as well as the syntheses and evaluation of a hundred oxazoline- and oxazole-containing compounds derived from an efficient three step process: 1) formation of beta-hydroxy amides with serine or threonine; 2) cyclization to afford oxazolines; and 3) dehydration to give the corresponding oxazoles. A number of compounds prepared by this method were shown to possess impressive activity against Mycobacterium tuberculosis, extremely low toxicity and therefore high therapeutic indexes, as well as activity against even the more recalcitrant non-replicating form of M. tuberculosis. The uniqueness of their structures and their simplicity should allow them to be further optimized to meet ADME (absorption, distribution, metabolism, excretion) requirements. The syntheses of eight of the most potent in vitro compounds were scaled up and the compounds were tested in an in vivo mouse infection model to evaluate their efficacy before engaging upon more elaborate compound design and optimization.
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Affiliation(s)
- Garrett C. Moraski
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46656
| | - Mayland Chang
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46656
| | - Adriel Villegas-Estrada
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46656
| | - Scott G. Franzblau
- Institute for Tuberculosis Research, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois 60612
| | - Ute Möllmann
- Leibniz Institute for Natural Product Research and Infection Biology - Hans Knoell Institute, Beutenbergstrasse 11a, 07745 Jena, Germany
| | - Marvin J. Miller
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46656
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91
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Wan C, Zhang J, Wang S, Fan J, Wang Z. Facile Synthesis of Polysubstituted Oxazoles via A Copper-Catalyzed Tandem Oxidative Cyclization. Org Lett 2010; 12:2338-41. [DOI: 10.1021/ol100688c] [Citation(s) in RCA: 140] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Changfeng Wan
- Hefei National Laboratory for Physical Sciences at Microscale, CAS Key Laboratory of Soft Matter Chemistry and Department of Chemistry, University of Science and Technology of China, Hefei, 230026, P. R. China
| | - Jintang Zhang
- Hefei National Laboratory for Physical Sciences at Microscale, CAS Key Laboratory of Soft Matter Chemistry and Department of Chemistry, University of Science and Technology of China, Hefei, 230026, P. R. China
| | - Sujing Wang
- Hefei National Laboratory for Physical Sciences at Microscale, CAS Key Laboratory of Soft Matter Chemistry and Department of Chemistry, University of Science and Technology of China, Hefei, 230026, P. R. China
| | - Jinmin Fan
- Hefei National Laboratory for Physical Sciences at Microscale, CAS Key Laboratory of Soft Matter Chemistry and Department of Chemistry, University of Science and Technology of China, Hefei, 230026, P. R. China
| | - Zhiyong Wang
- Hefei National Laboratory for Physical Sciences at Microscale, CAS Key Laboratory of Soft Matter Chemistry and Department of Chemistry, University of Science and Technology of China, Hefei, 230026, P. R. China
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92
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Ramirez TA, Zhao B, Shi Y. An effective C-C double bond formation via Cu(I)-catalyzed dehydrogenation. Tetrahedron Lett 2010; 51:1822-1825. [PMID: 20368750 PMCID: PMC2847290 DOI: 10.1016/j.tetlet.2010.01.114] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
A dehydrogenation method using Cu(I) and either N,N-di-tert-butylthiadiaziridine 1,1-dioxide or N,N-di-tert-butyldiaziridinone is reported. The dehydrogenation allows a facile introduction of C-C double bond(s) into various carbo- and heterocycles such as oxazolines and thiazolines.
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Affiliation(s)
- Thomas A. Ramirez
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523
| | - Baoguo Zhao
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523
| | - Yian Shi
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523
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93
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Shibata K, Yoshida M, Doi T, Takahashi T. Derivatization of a tris-oxazole using Pd-catalyzed coupling reactions of a 5-bromooxazole moiety. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.01.064] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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94
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Nagasawa K, Majima S, Tera M, Iida K, Shin-ya K. Design and Synthesis of Telomestatin Derivatives Containing Methyl Oxazole and Their G-Quadruplex Stabilizing Activities. HETEROCYCLES 2010. [DOI: 10.3987/com-10-s(e)85] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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95
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Rodriguez-Lucena D, Gaboriau F, Rivault F, Schalk IJ, Lescoat G, Mislin GLA. Synthesis and biological properties of iron chelators based on a bis-2-(2-hydroxy-phenyl)-thiazole-4-carboxamide or -thiocarboxamide (BHPTC) scaffold. Bioorg Med Chem 2009; 18:689-95. [PMID: 20036563 DOI: 10.1016/j.bmc.2009.11.057] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2009] [Revised: 11/17/2009] [Accepted: 11/28/2009] [Indexed: 01/09/2023]
Abstract
Bis-2-(2-hydroxy-phenyl)-thiazole-4-carboxamides and -thiocarboxamides (BHPTCs) form a family of gemini hexacoordinated bis-tridentate chelating scaffolds. Four molecules were synthesized and shown to chelate iron(III) efficiently with a 1:1 stoichiometry. A dithioamide BHPTC displayed promising antiproliferative activity in several cancerous cell lines, making this molecule an interesting lead compound for the design of new iron-chelating anticancer drugs. Conversely, diamide BHPTCs had significant cytoprotective activity against iron overload in HepaRG cells in vitro, and were as efficient as and less toxic than deferoxamine B (DFO).
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Affiliation(s)
- David Rodriguez-Lucena
- Métaux et Microorganismes: Chimie, Biologie et Applications, IREBS FRE3211-CNRS/Université de Strasbourg, ESBS, Boulevard Sébastien Brant, F-67400 Illkirch, France
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96
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Hoffman TJ, Dash J, Rigby JH, Arseniyadis S, Cossy J. Enantioselective Organocatalytic Conjugate Reduction of β-Azole-Containing α,β-Unsaturated Aldehydes. Org Lett 2009; 11:2756-9. [DOI: 10.1021/ol900893e] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Thomas J. Hoffman
- Laboratoire de Chimie Organique, ESPCI ParisTech, CNRS, 10 rue Vauquelin, F-75231 Paris Cedex 05, France
| | - Jyotirmayee Dash
- Laboratoire de Chimie Organique, ESPCI ParisTech, CNRS, 10 rue Vauquelin, F-75231 Paris Cedex 05, France
| | - James H. Rigby
- Laboratoire de Chimie Organique, ESPCI ParisTech, CNRS, 10 rue Vauquelin, F-75231 Paris Cedex 05, France
| | - Stellios Arseniyadis
- Laboratoire de Chimie Organique, ESPCI ParisTech, CNRS, 10 rue Vauquelin, F-75231 Paris Cedex 05, France
| | - Janine Cossy
- Laboratoire de Chimie Organique, ESPCI ParisTech, CNRS, 10 rue Vauquelin, F-75231 Paris Cedex 05, France
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97
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Lu Y, Li CM, Wang Z, Ross CR, Chen J, Dalton J, Li W, Miller D. Discovery of 4-substituted methoxybenzoyl-aryl-thiazole as novel anticancer agents: synthesis, biological evaluation, and structure-activity relationships. J Med Chem 2009; 52:1701-11. [PMID: 19243174 PMCID: PMC2760094 DOI: 10.1021/jm801449a] [Citation(s) in RCA: 139] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A series of 4-substituted methoxybenzoyl-aryl-thiazoles (SMART) have been discovered and synthesized as a result of structural modifications of the lead compound 2-arylthiazolidine-4-carboxylic acid amides (ATCAA). The antiproliferative activity of the SMART agents against melanoma and prostate cancer cells was improved from muM to low nM range compared with the ATCAA series. The structure-activity relationship was discussed from modifications of "A", "B", and "C" rings and the linker. Preliminary mechanism of action studies indicated that these compounds exert their anticancer activity through inhibition of tubulin polymerization.
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Affiliation(s)
- Yan Lu
- Department of Pharmaceutical Sciences, University of Tennessee, Health Science Center, Memphis, TN 38163
| | - Chien-Ming Li
- Division of Pharmaceutics, College of Pharmacy, The Ohio State University, Columbus, OH, 43210
| | - Zhao Wang
- Department of Pharmaceutical Sciences, University of Tennessee, Health Science Center, Memphis, TN 38163
| | | | - Jianjun Chen
- Department of Pharmaceutical Sciences, University of Tennessee, Health Science Center, Memphis, TN 38163
| | - James Dalton
- Division of Pharmaceutics, College of Pharmacy, The Ohio State University, Columbus, OH, 43210
| | - Wei Li
- Department of Pharmaceutical Sciences, University of Tennessee, Health Science Center, Memphis, TN 38163
| | - Duane.D. Miller
- Department of Pharmaceutical Sciences, University of Tennessee, Health Science Center, Memphis, TN 38163
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98
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Dehydrative cyclization of serine, threonine, and cysteine residues catalyzed by molybdenum(VI) oxo compounds. Tetrahedron 2009. [DOI: 10.1016/j.tet.2008.12.074] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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99
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Gaumont AC, Gulea M, Levillain J. Overview of the Chemistry of 2-Thiazolines. Chem Rev 2009; 109:1371-401. [DOI: 10.1021/cr800189z] [Citation(s) in RCA: 134] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Annie-Claude Gaumont
- Laboratoire de Chimie Moléculaire et Thioorganique, UMR CNRS 6507, INC3M, FR 3038, ENSICAEN & Université de Caen, 14050 Caen, France
| | - Mihaela Gulea
- Laboratoire de Chimie Moléculaire et Thioorganique, UMR CNRS 6507, INC3M, FR 3038, ENSICAEN & Université de Caen, 14050 Caen, France
| | - Jocelyne Levillain
- Laboratoire de Chimie Moléculaire et Thioorganique, UMR CNRS 6507, INC3M, FR 3038, ENSICAEN & Université de Caen, 14050 Caen, France
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100
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Loos P, Riedrich M, Arndt HD. Aza-Wittig access to chiral imidazol(in)es. Chem Commun (Camb) 2009:1900-2. [DOI: 10.1039/b822436f] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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