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Aponte JC, Verástegui M, Málaga E, Zimic M, Quiliano M, Vaisberg AJ, Gilman RH, Hammond GB. Synthesis, cytotoxicity, and anti-Trypanosoma cruzi activity of new chalcones. J Med Chem 2008; 51:6230-4. [PMID: 18798609 DOI: 10.1021/jm800812k] [Citation(s) in RCA: 99] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Synthesis of a cytotoxic dihydrochalcone, first isolated from a traditional Amazonian medicinal plant Iryanthera juruensis Warb (Myristicaceae), followed by a comprehensive SAR analysis of saturated and unsaturated chalcone synthetic intermediates, led to the identification of analogues with selective and significant in vitro anti- Trypanosoma cruzi activity. Further SAR studies were undertaken with the synthesis of 21 new chalcones containing two allyloxy moieties that resulted in the discovery of 2',4'-diallyloxy-6'-methoxy chalcones with improved selectivity against this parasite at concentrations below 25 microM, four of which exhibited a selectivity index greater than 12.
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Affiliation(s)
- José C Aponte
- Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, USA
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52
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Shing TKM, Cheng HM, Wong WF, Kwong CSK, Li J, Lau CBS, Leung PS, Cheng CHK. Enantiospecific Synthesis of Pseudoacarviosin as a Potential Antidiabetic Agent. Org Lett 2008; 10:3145-8. [DOI: 10.1021/ol8010503] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tony K. M. Shing
- Departments of Chemistry, Biochemistry, and Physiology, School of Pharmacy, and, Center of Novel Functional Molecules, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - Hau M. Cheng
- Departments of Chemistry, Biochemistry, and Physiology, School of Pharmacy, and, Center of Novel Functional Molecules, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - Wai F. Wong
- Departments of Chemistry, Biochemistry, and Physiology, School of Pharmacy, and, Center of Novel Functional Molecules, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - Connie S. K. Kwong
- Departments of Chemistry, Biochemistry, and Physiology, School of Pharmacy, and, Center of Novel Functional Molecules, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - Jianmei Li
- Departments of Chemistry, Biochemistry, and Physiology, School of Pharmacy, and, Center of Novel Functional Molecules, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - Clara B. S. Lau
- Departments of Chemistry, Biochemistry, and Physiology, School of Pharmacy, and, Center of Novel Functional Molecules, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - Po Sing Leung
- Departments of Chemistry, Biochemistry, and Physiology, School of Pharmacy, and, Center of Novel Functional Molecules, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - Christopher H. K. Cheng
- Departments of Chemistry, Biochemistry, and Physiology, School of Pharmacy, and, Center of Novel Functional Molecules, The Chinese University of Hong Kong, Shatin, Hong Kong, China
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53
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Mora G, Piechaczyk O, Le Goff XF, Le Floch P. Palladium-Catalyzed Deallylation of Allyl Ethers with a Xanthene Phosphole Ligand. Experimental and DFT Mechanistic Studies. Organometallics 2008. [DOI: 10.1021/om800051n] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Guilhem Mora
- Laboratoire “Hétéroéléments et Coordination”, Ecole Polytechnique, CNRS, 91128 Palaiseau Cedex, France
| | - Olivier Piechaczyk
- Laboratoire “Hétéroéléments et Coordination”, Ecole Polytechnique, CNRS, 91128 Palaiseau Cedex, France
| | - Xavier F. Le Goff
- Laboratoire “Hétéroéléments et Coordination”, Ecole Polytechnique, CNRS, 91128 Palaiseau Cedex, France
| | - Pascal Le Floch
- Laboratoire “Hétéroéléments et Coordination”, Ecole Polytechnique, CNRS, 91128 Palaiseau Cedex, France
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54
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Tsukamoto H, Suzuki T, Sato M, Kondo Y. Chromatography-free Pd-catalyzed deprotection of allyl ethers using PS-DEAM as a scavenger of boronic acids and Pd catalyst. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.10.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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55
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Tolosa J, Romero-Nieto C, Díez-Barra E, Sánchez-Verdú P, Rodríguez-López J. Control of Surface Functionality in Poly(phenylenevinylene) Dendritic Architectures. J Org Chem 2007; 72:3847-52. [PMID: 17439284 DOI: 10.1021/jo070210v] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The efficient synthesis of new asymmetric poly(phenylenevinylene) dendritic macromolecules using a stepwise convergent-growth approach is described. By an iterative methodology that made use of the Horner-Wadsworth-Emmons (HWE) reaction, dendrons and dendrimers up to the third generation, with eight different functional groups located at the periphery, were prepared in good yields. Both the number and placement of functionalities can be accurately controlled to afford a large variety of dendritic architectures.
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Affiliation(s)
- Juan Tolosa
- Facultad de Química, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain
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56
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Ambade AV, Chen Y, Thayumanavan S. Controlled functional group presentations in dendrimers as a tool to probe the hyperbranched architecture. NEW J CHEM 2007. [DOI: 10.1039/b617628c] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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57
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Aristegui SR, El-Murr MD, Golding BT, Griffin RJ, Hardcastle IR. Judicious Application of Allyl Protecting Groups for the Synthesis of 2-Morpholin-4-yl-4-oxo-4H-chromen-8-yl Triflate, a Key Precursor of DNA-Dependent Protein Kinase Inhibitors. Org Lett 2006; 8:5927-9. [PMID: 17165896 DOI: 10.1021/ol062297x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[Structure: see text] 2-morpholin-4-yl-4-oxo-4H-chromen-8-yl 2,2,2-trifluoromethanesulfonate is a key intermediate for the synthesis of the DNA-dependent protein kinase (DNA-PK) inhibitor 8-dibenzothiophen-4-yl-2-morpholin-4-yl-chromen-4-one (NU7441). Two improved methods for the synthesis of this triflate have been developed: (A) in 35% overall yield, through modification of the published route, and (B) in 15% overall yield, by a new route employing a Baker-Venkataraman rearrangement to enable generation of the chromenone scaffold. Both syntheses depend on the judicious use of allyl protecting groups.
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Affiliation(s)
- Sonsoles Rodriguez Aristegui
- Northern Institute for Cancer Research, School of Natural Sciences - Chemistry, Bedson Building, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK
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58
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Chan KF, Zhao Y, Burkett BA, Wong ILK, Chow LMC, Chan TH. Flavonoid Dimers as Bivalent Modulators for P-Glycoprotein-Based Multidrug Resistance: Synthetic Apigenin Homodimers Linked with Defined-Length Poly(ethylene glycol) Spacers Increase Drug Retention and Enhance Chemosensitivity in Resistant Cancer Cells. J Med Chem 2006; 49:6742-59. [PMID: 17154505 DOI: 10.1021/jm060593+] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Much effort has been spent on searching for better P-glycoprotein- (P-gp-) based multidrug resistance (MDR) modulators. Our approach was to target the binding sites of P-gp using dimers of dietary flavonoids. A series of apigenin-based flavonoid dimers, linked by poly(ethylene glycol) chains of various lengths, have been synthesized. These flavonoid dimers modulate drug chemosensitivity and retention in breast and leukemic MDR cells with the optimal number of ethylene glycol units equal to 2-4. Compound 9d bearing four ethylene glycol units increased drug accumulation in drug-resistant cells and enhanced cytotoxicity of paclitaxel, doxorubicin, daunomycin, vincristine, and vinblastine in drug-resistant breast cancer and leukemia cells in vitro, resulting in reduction of IC50 by 5-50 times. This compound also stimulated P-gp's ATPase activity by 3.3-fold. Its modulating activity was presumably by binding to the substrate binding sites of P-gp and disrupting drug efflux.
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Affiliation(s)
- Kin-Fai Chan
- Department of Applied Biology and Chemical Technology and the Institute of Molecular Technology for Drug Discovery and Synthesis, The Hong Kong Polytechnic University, Hong Kong SAR
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59
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Ganguly NC, Dutta S, Datta M. Mild and efficient deprotection of allyl ethers of phenols and hydroxycoumarins using a palladium on charcoal catalyst and ammonium formate. Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2006.05.176] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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60
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Tanaka S, Saburi H, Kitamura M. [CpRu(IV)(π-C3H5)(2-quinolinecarboxylato)]PF6 Complex: A Robust Catalyst for the Cleavage and Formation of Allyl Ethers. Adv Synth Catal 2006. [DOI: 10.1002/adsc.200505401] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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61
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Martinez A, Hemmert C, Loup C, Barré G, Meunier B. Synthesis of New Macrocyclic Chiral Manganese(III) Schiff Bases as Catalysts for Asymmetric Epoxidation. J Org Chem 2006; 71:1449-57. [PMID: 16468793 DOI: 10.1021/jo052113c] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We describe a general synthetic strategy for the preparation of a series of macrocyclic chiral manganese(III) salen complexes. The developed reaction pathway allows the modulation of the different key groups, namely, the chiral diimine, the bulky substituents in positions 3 and 3', and the linker used in the macrocyclization of the Schiff base. The different complexes presented here illustrate these readily available structural variations. The catalytic properties of the catalysts (5 mol %) were improved for the asymmetric epoxidation of 2,2'-dimethylchromene with NaOCl or H2O2 as oxygen atom donor. A large range of enantiomeric excesses was obtained (ee values from 30% to 96%), depending on the features and the stability of the complexes. The most efficient catalyst, in terms of stereoinduction (ee value = 96%), contains a diiminocyclohexyl moiety, ethyl groups in positions 3 and 3', and a short polyether junction arm.
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Affiliation(s)
- Alexandre Martinez
- Laboratoire de Chimie de Coordination du CNRS, 205 route de Narbonne, 31077 Toulouse cedex 4, France
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62
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Abstract
Syntheses up to three generations have been achieved of biaryl-based amphiphilic dendrons with a charge-neutral pentaethylene glycol as the hydrophilic part and a decyl chain as the hydrophobic part. Studies on the temperature-dependent characteristics revealed that these dendrons exhibit a generation-dependent lower critical solution temperature (LCST). This behavior is attributed to the combination of the amphipathic nature of the hydrophilic pentaethylene glycol side chain and dendritic effect. Interestingly, this biaryl-based scaffold also maintains the ability to form a micelle-like assembly in polar solvents and an inverted micelle-like assembly in apolar solvents. Polarity of the dendritic interior was investigated using dye-based microenvironment studies. The aggregation behavior of these micelles was analyzed by fluorescence spectroscopy and dynamic light scattering. Critical micelle concentrations (CMC) of these assemblies were investigated using fluorescence excitation spectra of the sequestered guest molecule, pyrene.
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64
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Anderson JC, Denton RM, Wilson C. A Biomimetic Strategy for the Synthesis of the Tricyclic Dibenzofuran-1,4-dione Core of Popolohuanone E. Org Lett 2004; 7:123-5. [PMID: 15624993 DOI: 10.1021/ol047825o] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A concise synthesis of the complete tricyclic dibenzofuran-1,4-dione aromatic core of popolohuanone E has been demonstrated by mild base treatment of a biquinone intermediate, thus establishing a biomimetic route to this family of heterocyclic ring systems and the total synthesis of popolohuanone E.
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Affiliation(s)
- James C Anderson
- School of Chemistry, University of Nottingham, Nottingham NG7 2RD, UK.
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65
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Tanaka S, Saburi H, Ishibashi Y, Kitamura M. CpRuIIPF6/quinaldic acid-catalyzed chemoselective allyl ether cleavage. A simple and practical method for hydroxyl deprotection. Org Lett 2004; 6:1873-5. [PMID: 15151436 DOI: 10.1021/ol0493397] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A cationic CpRu(II) complex in combination with quinaldic acid shows high reactivity and chemoselectivity for the catalytic deprotection of hydroxyl groups protected as allyl ethers. The catalyst operates in alcoholic solvents without the need for any additional nucleophiles, satisfying the practical requirements of operational simplicity, safety, and environmental friendliness. The wide applicability of this deprotection strategy to a variety of multifunctional molecules, including peptides and nucleosides, may provide new opportunities in protective group chemistry. [structure: see text]
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Affiliation(s)
- Shinji Tanaka
- Research Center for Materials Science and Department of Chemistry, Nagoya University, Chikusa, Nagoya 464-8602, Japan
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66
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Murakami H, Minami T, Ozawa F. Facile and Selective Deallylation of Allyl Ethers Using Diphosphinidenecyclobutene-Coordinated Palladium Catalysts. J Org Chem 2004; 69:4482-6. [PMID: 15202905 DOI: 10.1021/jo049732q] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
(pi-Allyl)palladium triflate bearing a 1,2-bis(4-methoxyphenyl)-3,4-bis(2,4,6-tri-tert-butylphenylphosphinidene)cyclobutene ligand (DPCB-OMe), [Pd(eta(3)-C(3)H(5))(DPCB-OMe)]OTf, efficiently catalyzes deallylation of a variety of allyl ethers in aniline to give corresponding alcohols in high yields under mild conditions. The reactions can be performed in air without loss of a variety of functionalities including vinyl, alkynyl, hydroxy, acetoxy, silyloxy, and acetal groups. Allyl 2-allyloxybenzoate selectively undergoes deallylation of the allyloxy group to give allyl salicylate in quantitative yield.
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Affiliation(s)
- Hiromi Murakami
- Research Center for Elements Science, Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
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67
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Liu QZ, Xie NS, Luo ZB, Cui X, Cun LF, Gong LZ, Mi AQ, Jiang YZ. Facile Preparation of Optically Pure 7,7‘-Disubstituted BINOLs and Their Application in Asymmetric Catalysis. J Org Chem 2003; 68:7921-4. [PMID: 14510582 DOI: 10.1021/jo034831+] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A family of optically pure 7,7'-disubsituted-2,2'-dihydroxy-1,1'-dinaphthyls have been conveniently prepared from easily accessible 7-alloxyl-2-naphthol by reaction sequences beginning with the asymmetric oxidative coupling and followed by key synthetic steps including deprotection, alkylation, and Suzuki coupling. Application of these binaphthols in catalytic phenylacetylene addition to aldehydes resulted in excellent enantioselectivities.
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Affiliation(s)
- Quan-Zhong Liu
- Key Laboratory for Asymmetric Synthesis and Chirotechnology of Sichuan Province, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu, 610041, China
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68
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