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Molecules, Volume 11, Issue 12 (December 2006), Pages 940-1014

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Research

Open AccessArticle Microwave Assisted Synthesis of Molybdenum and Tungsten Tetracarbonyl Complexes with a Pyrazolylpyridine Ligand. Crystal structure of cis-[Mo(CO)4{ethyl[3-(2-pyridyl)-1-pyrazolyl]acetate}]
Molecules 2006, 11(12), 940-952; doi:10.3390/molecules11120940
Received: 17 November 2006 / Revised: 4 December 2006 / Accepted: 5 December 2006 / Published: 6 December 2006
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Abstract
We report the one-step syntheses in good yields of the complexes cis-[M(CO)4(pzpy)] {M = Mo, W; pzpy = ethyl[3-(2-pyridyl)-1-pyrazolyl]acetate} directlyfrom the corresponding M(CO)6 starting materials by using microwave-assisted heatingand reaction times of either 30 s (M = Mo) or 15
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We report the one-step syntheses in good yields of the complexes cis-[M(CO)4(pzpy)] {M = Mo, W; pzpy = ethyl[3-(2-pyridyl)-1-pyrazolyl]acetate} directlyfrom the corresponding M(CO)6 starting materials by using microwave-assisted heatingand reaction times of either 30 s (M = Mo) or 15 min (M = W). The structure of themolybdenum tetracarbonyl complex was determined by single crystal X-ray diffraction.The compound is monomeric and the molybdenum atom has a highly distorted octahedralgeometry. The close packing of the individual cis-[Mo(CO)4(pzpy)] species is essentiallydriven by the need to fill the space effectively, closely mediated by weak C–H···O andπ···π interactions. Full article
Open AccessCommunication Synthesis and Characterization of Dimethacrylate Monomer with High Molecular Weight for Root Canal Filling Materials
Molecules 2006, 11(12), 953-958; doi:10.3390/11120953
Received: 18 November 2006 / Revised: 4 December 2006 / Accepted: 4 December 2006 / Published: 7 December 2006
Cited by 11 | PDF Full-text (48 KB) | HTML Full-text | XML Full-text
Abstract
A new dimethacrylate monomer 9,9'-bis[4-(2'-hydroxy-3'-methacryloyloxy-propoxy)phenyl] fluorene (3) with a molecular weight of 634 was synthesized in 51.4%yield by addition of a glycidyl ether group to 9,9'-bis(4-hydroxyphenyl) fluorene (1) bythe reaction of compound 1 with epichlorohydrin, and then introducing the methacrylatemoiety by the reaction
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A new dimethacrylate monomer 9,9'-bis[4-(2'-hydroxy-3'-methacryloyloxy-propoxy)phenyl] fluorene (3) with a molecular weight of 634 was synthesized in 51.4%yield by addition of a glycidyl ether group to 9,9'-bis(4-hydroxyphenyl) fluorene (1) bythe reaction of compound 1 with epichlorohydrin, and then introducing the methacrylatemoiety by the reaction of the epoxy group with methacrylic acid. The structure ofmonomer 3 was confirmed by FT-IR, 1H-NMR, mass spectra and elemental analysis. Full article
Open AccessArticle Synthesis of (R)-2-(Benzyloxy)-tetrahydro-5,5-dimethylfuran by a New Oxidative Rearrangement
Molecules 2006, 11(12), 959-967; doi:10.3390/11120959
Received: 12 November 2006 / Revised: 12 December 2006 / Accepted: 15 December 2006 / Published: 18 December 2006
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Abstract The rearrangement under oxidative conditions of 3-(benzyloxy)-tetrahydro- 2,6,6-trimethyl-2H-pyran-2-carbaldehydes to afford a chiral protected tetrahydrofuran lactol is described. Full article
Open AccessCommunication Hyperbranched Molecular Structures with Potential Antiviral Activity: Derivatives of 5,6-Dihydroxyindole-2-Carboxylic Acid
Molecules 2006, 11(12), 968-977; doi:10.3390/11120968
Received: 25 October 2006 / Revised: 8 December 2006 / Accepted: 15 December 2006 / Published: 18 December 2006
Cited by 3 | PDF Full-text (61 KB) | HTML Full-text | XML Full-text
Abstract In the search of new HIV-1 integrase (IN) inhibitors, we synthesized a series of multimeric 5,6-dihydroxyindole-2-carboxylic acid (DHICA) derivatives. Preliminary results indicate that hyperbranched architectures could represent a peculiar molecular requisite for the development of new antiviral lead compounds. Full article
Open AccessArticle CuCl2-catalyzed One-pot Formation of Tetrahydroquinolines from N-Methyl-N-alkylanilines and Vinyl Ethers in the Presence of t-Butylhydroperoxide
Molecules 2006, 11(12), 978-987; doi:10.3390/11120978
Received: 6 October 2006 / Revised: 12 December 2006 / Accepted: 15 December 2006 / Published: 20 December 2006
Cited by 9 | PDF Full-text (81 KB) | HTML Full-text | XML Full-text
Abstract Tetrahydroquinoline skeletons can be formed by a CuCl2-catalyzed one-potreaction of N-methyl-N-alkylanilines and vinyl ethers in the presence of t-butyl-hydroperoxide. Full article
Open AccessArticle Preparation of 6-Substituted Quinoxaline JSP-1 Inhibitors by Microwave Accelerated Nucleophilic Substitution
Molecules 2006, 11(12), 988-999; doi:10.3390/11120988
Received: 27 November 2006 / Revised: 17 December 2006 / Accepted: 18 December 2006 / Published: 21 December 2006
Cited by 10 | PDF Full-text (93 KB) | HTML Full-text | XML Full-text
Abstract A small library of 6-aminoquinoxalines has been prepared by nucleophilic substitution of 6-fluoroquinoxaline with amines and nitrogen-containing heterocycles under computer-controlled microwave irradiation. Some compounds were found to be potent inhibitors of JNK Stimulatory Phosphatase-1 (JSP-1) in an in vitro biological assay. Full article
Open AccessArticle Synthesis and Spectral Investigations of Manganese(II), Cobalt(II), Nickel(II), Copper(II) and Zinc(II) Complexes of New Polydentate Ligands Containing a 1,8-Naphthyridine Moiety
Molecules 2006, 11(12), 1000-1008; doi:10.3390/11121000
Received: 14 November 2006 / Revised: 12 December 2006 / Accepted: 17 December 2006 / Published: 21 December 2006
Cited by 13 | PDF Full-text (80 KB) | HTML Full-text | XML Full-text
Abstract
2-(o-Hydroxyphenyl)-1,8-naphthyridine (HN), 2-(4-hydroxy-6-methylpyran-2-one-3-yl)-1,8-naphthyridine (HMPN) and 2-(benzimidazol-2-yl)-1,8-naphthyridine(BN) react with acetates of Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) to yield metal ioncomplexes of definite composition. These compounds were characterized by elementalanalyses, molar conductivity, magnetic susceptibility measurements, thermal studies, IR,UV-visible, NMR and mass spectral investigations. The
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2-(o-Hydroxyphenyl)-1,8-naphthyridine (HN), 2-(4-hydroxy-6-methylpyran-2-one-3-yl)-1,8-naphthyridine (HMPN) and 2-(benzimidazol-2-yl)-1,8-naphthyridine(BN) react with acetates of Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) to yield metal ioncomplexes of definite composition. These compounds were characterized by elementalanalyses, molar conductivity, magnetic susceptibility measurements, thermal studies, IR,UV-visible, NMR and mass spectral investigations. The complexes are found to have theformulae [M(HN)2(H2O)2], [M(HMPN)2(H2O)2] and [M(BN)2(OAc)2], respectively. Full article
Open AccessCommunication A New Neolignan Glycoside from the Leaves of Acer truncatum
Molecules 2006, 11(12), 1009-1014; doi:10.3390/11121009
Received: 18 October 2006 / Revised: 27 November 2006 / Accepted: 28 November 2006 / Published: 21 December 2006
Cited by 13 | PDF Full-text (95 KB) | HTML Full-text | XML Full-text
Abstract
A new neolignan glycoside, (7R,8R)-7,8-dihydro-9′-hydroxyl-3′-methoxyl- 8-hydroxymethyl-7-(4-hydroxy-3-methoxyphenyl)-1′-benzofuranpropanol 9′-O-β-D- glucopyranoside (1) was isolated from the leaves of Acer truncatum along with (7R,8R)-7,8-dihydro-9′-hydroxyl-3′-methoxyl-8-hydroxymethyl-7-(4-O-α-L-rhamno- pyranosyloxy-3-methoxyphenyl)-1′-benzofuranpropanol (2), schizandriside (3), lyoniresinol (4), berchemol (5), (-)-pinoresinol-4-O-β-D-glucopyranoside (6), hecogenin (7), chlorogenic acid (8) and neochlorogenic acid (9). Their structures were elucidated
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A new neolignan glycoside, (7R,8R)-7,8-dihydro-9′-hydroxyl-3′-methoxyl- 8-hydroxymethyl-7-(4-hydroxy-3-methoxyphenyl)-1′-benzofuranpropanol 9′-O-β-D- glucopyranoside (1) was isolated from the leaves of Acer truncatum along with (7R,8R)-7,8-dihydro-9′-hydroxyl-3′-methoxyl-8-hydroxymethyl-7-(4-O-α-L-rhamno- pyranosyloxy-3-methoxyphenyl)-1′-benzofuranpropanol (2), schizandriside (3), lyoniresinol (4), berchemol (5), (-)-pinoresinol-4-O-β-D-glucopyranoside (6), hecogenin (7), chlorogenic acid (8) and neochlorogenic acid (9). Their structures were elucidated on the basis of extensive spectroscopic data. The absolute configuration of compounds 1 was established by its CD spectrum. The antibacterial activities of compounds 1-7 were evaluated. Full article

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