Search results for: Hilary A. Jenkins

Items from 1 to 20 out of 39 results

article

Epoxynemanione A, nemanifuranones A–F, and nemanilactones A–C, from Nemania serpens, an endophytic fungus isolated from Riesling grapevines

Ashraf Ibrahim, Dan Sørensen, Hilary A. Jenkins, Linda Ejim, more

Phytochemistry > 2017 > 140 > C > 16-26

Ten polyketide specialized metabolites, epoxynemanione A, nemanifuranones A–F, and nemanilactones A–C, were isolated from the culture filtrate of Nemania serpens (Pers.) Grey (1821), an endophytic fungus from a Riesling grapevine (Vitis vinifera) found in Canada's Niagara region. Additionally, four known metabolites 2-(hydroxymethyl)-3-methoxy-benzoic acid, phyllostine, 5-methylmellein and a nordammarane...

article

Potassium and Yttrium Complexes of a Rigid Bis‐Phosphido POP‐Donor Ligand

Kelly S. A. Motolko, David J. H. Emslie, Hilary A. Jenkins, James F. Britten

European Journal of Inorganic Chemistry > 2017 > 22 > 2920 - 2927

Dilithiation of 4,5‐dibromo‐2,7‐di‐tert‐butyl‐9,9‐dimethyl‐xanthene (XBr₂) followed by addition of 2 equiv. of (2,4,6‐triisopropylphenyl)dichlorophosphine (TrippPCl₂) afforded 4,5‐bis[(2,4,6‐triisopropylphenyl)chlorophosphino]‐2,7‐di‐tert‐butyl‐9,9‐dimethylxanthene (XP₂Cl₂), which was reduced to 4,5‐bis[(2,4,6‐triisopropylphenyl)phosphino]‐2,7‐di‐tert‐butyl‐9,9‐dimethylxanthene (H₂XP₂) using excess...

article

Asymmetric Organocatalytic Stepwise [2+2] Entry to Tetra‐Substituted Heterodimeric and Homochiral Cyclobutanes

Alex J. Nielsen, Hilary A. Jenkins, James McNulty

Chemistry – A European Journal > 22 > 27 > 9111 - 9115

An asymmetric synthesis of tetra‐substituted cyclobutanes involving an organocatalytic, stepwise [2+2]‐cycloaddition is described. The secondary‐amine‐catalyzed method allows for the hetero‐dimerization of two different cinnamic‐acid‐derived sub‐units, opening a novel one‐step assembly to densely functionalized, head‐to‐tail coupled dimeric cyclobutanes in high enantiomeric excess. A series of selective...

article

Enantioselective Total Synthesis of the Proposed Structure of the Endophytic Fungal Metabolite Phomolide G: Structural Revision and Unambiguous Stereochemical Assignment

James McNulty, David McLeod, Hilary A. Jenkins

European Journal of Organic Chemistry > 2016 > 4 > 688 - 692

A total synthesis of the proposed structure of the natural macrolactone phomolide G (1) by a bidirectional strategy from L‐tartaric acid is reported. The ω‐terminus of the molecule was elaborated by nitrile extension, C3‐alkylation and a substrate‐controlled 1,3‐ketone reduction. The α‐terminus was extended by a C₂ aldehyde‐to‐alkenal homologation followed by an auxiliary controlled aldol reaction...

article

Establishing the Coordination Chemistry of Antimony(V) Cations: Systematic Assessment of Ph₄Sb(OTf) and Ph₃Sb(OTf)₂ as Lewis Acceptors

Alasdair P. M. Robertson, Saurabh S. Chitnis, Hilary A. Jenkins, Robert McDonald, more

Chemistry – A European Journal > 21 > 21 > 7902 - 7913

The coordination chemistry of the stiboranes Ph₄Sb(OTf) (1 a, OTf = OSO₂CF₃) and Ph₃Sb(OTf)₂ (3) with Lewis bases has been investigated. The significant steric encumbrance of the Sb center in 1 a precludes interaction with most ligands, but the relatively low steric demands of 4‐methylpyridine‐N‐oxide (OPyrMe) and OPMe₃ enabled the characterization of [Ph₄Sb(OPyrMe)][OTf] (2 a) and [Ph₄Sb(OPMe₃)][OTf]...

article

New diplosporin and agistatine derivatives produced by the fungal endophyte Xylaria sp. isolated from Vitis labrusca

Ashraf Ibrahim, Dan Sørensen, Hilary A. Jenkins, Brian E. McCarry, more

Phytochemistry Letters > 2014 > 9 > Complete > 179-183

A Xylaria sp. was isolated as an endophyte from a surface-sterilized Concord grape leaf (Vitis labrusca). Dereplication and LC–MS analysis of the filtrate extracts identified two new structures, compound 1, 13-O-methyl-(5R) diplosporin, and 2 a new agistatine. Additionally, five known compounds 3–7 including an agistatine, coriloxin, (5R)-diplosporin, and two mellein derivatives were also isolated...

article

Synthesis, spectroscopic characterization, X-ray structure, and in vitro antitumor activities of new triorganotin(IV) complexes with sulfur donor ligand

Mojdeh Safari, Mohammad Yousefi, Hilary A. Jenkins, Maryam Bikhof Torbati, more

Medicinal Chemistry Research > 2013 > 22 > 12 > 5730-5738

The discovery of the anticancer properties of cisplatin promoted a great deal of interest in the area of metal-based antitumor agents. With this aim, a new series of triorganotin(IV) derivatives: Ph₃SnL (1), BZ₃SnL (2), where L = morpholine-1-carbodithioate (MCDT) have been synthesized by the reaction of triorganotin(IV) chlorides with the ligand-salt in the appropriate molar ratio. All the complexes...

article

Structural and magnetic properties of homoleptic iron(III) complexes containing N-(8-quinolyl)-salicylaldimine [Fe(Qsal)₂]⁺X⁻ {X = I or (Qsal)FeCl₃}

Brandon Djukic, Hilary A. Jenkins, Takele Seda, Martin T. Lemaire

Transition Metal Chemistry > 2013 > 38 > 2 > 207-212

The structural properties of two homoleptic iron(III) complexes containing N-(8-quinolyl)-salicylaldimine (qsalH) are reported on the basis of two single-crystal X-ray diffraction experiments. The complexes are shown to share the general formula [Fe(qsal)₂]⁺X⁻ {X = I (1) or (qsal)FeCl₃ (2)} and include one new complex 2 and one previously reported complex 1 for which structural details were until...

article

Divergent reactivity of [(κ3-L)ThCl2(dme)] with Grignard reagents: Alkylation, ancillary ligand transfer to magnesium, and halide exchange caught in the act

Carlos A. Cruz, Terry Chu, David J.H. Emslie, Hilary A. Jenkins, more

Journal of Organometallic Chemistry > 2010 > 695 > 25-26 > 2798-2803

Reaction of [(BDPP)ThCl ₂ (dme)] (1) with 2 equivalents of MeMgBr in OEt ₂ , followed by filtration and layering a toluene solution with hexanes at −30 °C yielded a single large crystal of [{(BDPP)ThX(μ-X) ₂ Mg(OEt ₂ )(μ-Me)} ₂ ]·2 toluene (X = Br _0.73–0.87 /Cl _0.13–0.27 ; 3·2 toluene). This product is the result of halide exchange to form a...

article

Persistent Metal Bis(Hexafluoroacetylacetonato) Complexes Featuring a 2,2′-Bipyridine Substituted Triarylamminium Radical Cation

Sharew Adugna, Kseniya Revunova, Brandon Djukic, Serge I. Gorelsky, more

Inorganic Chemistry > 2010 > 49 > 21 > 10183 - 10190

article

Diversity of Metal−Ligand Interactions in Halide (X = I, Br, Cl, F) and Halide-Free Ambiphilic Ligand Rhodium Complexes

Bradley E. Cowie, David J. H. Emslie, Hilary A. Jenkins, James F. Britten

Inorganic Chemistry > 2010 > 49 > 9 > 4060 - 4072

article

Oxazoles XXI. Three Ester Ammonium Salts Resulting from the Rupture of an Oxazoline Ring

Robert A. Gossage, Hilary A. Jenkins, J. Wilson Quail

Journal of Chemical Crystallography > 2010 > 40 > 3 > 272-277

The synthesis and characterisation of three ammonium salts that are formed via a ring opening of a 2-oxazoline (i.e., a 4,5-dihydro-1,3-oxazole) are described. Compound 1, derived from 2-phenyl-2-oxazoline (Phox), was isolated as a major reaction product during an unrelated synthesis using Phox which was being carried out in the presence of NO₃ ⁻ ions. The isolated compound is identified as the nitrate...

article

The synthesis and crystal structure of unsubstituted 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY)

Kha Tram, Hongbin Yan, Hilary A. Jenkins, Serguei Vassiliev, more

Dyes and Pigments > 2009 > 82 > 3 > 392-395

The fully unsubstituted 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) was synthesized for the first time by oxidation of dipyrromethane followed by treatment with boron trifluoride diethyl etherate in the presence of a base. The compound was fully characterized and its X-ray crystal structure is reported.

article

Bimetallic Iron(3+) Spin-Crossover Complexes Containing a 2,2′-Bithienyl Bridging bis-QsalH Ligand

Brandon Djukic, Prashanth K. Poddutoori, Paul A. Dube, Takele Seda, more

Inorganic Chemistry > 2009 > 48 > 13 > 6109 - 6116

article

Cationic Thorium Alkyl Complexes of Rigid NON- and NNN-Donor Ligands: π-Arene Coordination as a Persistent Structural Motif

Carlos A. Cruz, David J. H. Emslie, Craig M. Robertson, Laura E. Harrington, more

Organometallics > 2009 > 28 > 6 > 1891 - 1899

article

Preparation and Magnetic Properties of Iron(3+) Spin-Crossover Complexes Bearing a Thiophene Substituent: Toward Multifunctional Metallopolymers

Brandon Djukic, Paul A. Dube, Fereidoon Razavi, Takele Seda, more

Inorganic Chemistry > 2009 > 48 > 2 > 699 - 707

article

Group 10 Transition-Metal Complexes of an Ambiphilic PSB-Ligand: Investigations into η ³ ( BCC )-Triarylborane Coordination

David J. H. Emslie, Laura E. Harrington, Hilary A. Jenkins, Craig M. Robertson, more

Organometallics > 2008 > 27 > 20 > 5317 - 5325

article

Cationic ligands for Ag(I): Organometallic polymers versus unimolecular complexes

Darren D.J.W. Mercer, Hilary A. Jenkins

Inorganica Chimica Acta > 2007 > 360 > 9 > 3091-3098

We have prepared and characterized two cationic ligands and their Ag(I) coordination compounds. For the bidentate ligand 2, 2,2-bis-pyridin-2-ylmethyl-2,3-dihydro-1H-isoindolium bromide, we obtained the organometallic polymer [AgL] _x [CF ₃ SO ₃ ] _2x (4), and the unimolecular complex [AgL ₂ ][PF ₆ ] ₃ (5). Compound 4 exists as an organometallic...

article

Ruthenium vinylidene and carbyne complexes containing a multifunctional tridentate ligand with a PNN donor set

Nicholas J. Beach, Jesse M. Walker, Hilary A. Jenkins, Gregory J. Spivak

Journal of Organometallic Chemistry > 2006 > 691 > 19 > 4147-4152

The neutral, octahedral ruthenium vinylidene complexes mer,trans-[(PNN)Cl ₂ Ru(CCHR)] (PNN=N-(2-diphenylphosphinobenzylidene)-2-(2-pyridyl)ethylamine; R=Ph, 1a; R= ^t Bu, 1b) are reported. An X-ray crystallographic study of 1a confirms the tridentate, meridional coordination mode of the PNN ligand. Compounds 1a and 1b undergo regioselective electrophilic addition with HBF ₄ ...

article

Oxazoline chemistry. Part 12: A metal-mediated synthesis of DMU-212; X-ray diffraction studies of an important anti-cancer agent

Gordon G. Cross, Charles R. Eisnor, Robert A. Gossage, Hilary A. Jenkins

Tetrahedron Letters > 2006 > 47 > 13 > 2245-2247

An improved synthesis of the anti-cancer agent DMU-212 (trans-3,4,5,4′-tetramethoxystilbene) is described. The methodology involves the use of a Pd-oxazoline catalyst as a mediator of a regio-selective (Heck) C–C bond formation reaction. A simple isolation step is then used to obtain the title material. The compound has been further characterised in the solid-state by X-ray diffraction methods.

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Search results for: Hilary A. Jenkins

Epoxynemanione A, nemanifuranones A–F, and nemanilactones A–C, from Nemania serpens, an endophytic fungus isolated from Riesling grapevines

Potassium and Yttrium Complexes of a Rigid Bis‐Phosphido POP‐Donor Ligand

Asymmetric Organocatalytic Stepwise [2+2] Entry to Tetra‐Substituted Heterodimeric and Homochiral Cyclobutanes

Enantioselective Total Synthesis of the Proposed Structure of the Endophytic Fungal Metabolite Phomolide G: Structural Revision and Unambiguous Stereochemical Assignment

Establishing the Coordination Chemistry of Antimony(V) Cations: Systematic Assessment of Ph₄Sb(OTf) and Ph₃Sb(OTf)₂ as Lewis Acceptors

New diplosporin and agistatine derivatives produced by the fungal endophyte Xylaria sp. isolated from Vitis labrusca

Synthesis, spectroscopic characterization, X-ray structure, and in vitro antitumor activities of new triorganotin(IV) complexes with sulfur donor ligand

Structural and magnetic properties of homoleptic iron(III) complexes containing N-(8-quinolyl)-salicylaldimine [Fe(Qsal)₂]⁺X⁻ {X = I or (Qsal)FeCl₃}

Divergent reactivity of [(κ3-L)ThCl2(dme)] with Grignard reagents: Alkylation, ancillary ligand transfer to magnesium, and halide exchange caught in the act

Persistent Metal Bis(Hexafluoroacetylacetonato) Complexes Featuring a 2,2′-Bipyridine Substituted Triarylamminium Radical Cation

Diversity of Metal−Ligand Interactions in Halide (X = I, Br, Cl, F) and Halide-Free Ambiphilic Ligand Rhodium Complexes

Oxazoles XXI. Three Ester Ammonium Salts Resulting from the Rupture of an Oxazoline Ring

The synthesis and crystal structure of unsubstituted 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY)

Bimetallic Iron(3+) Spin-Crossover Complexes Containing a 2,2′-Bithienyl Bridging bis-QsalH Ligand

Cationic Thorium Alkyl Complexes of Rigid NON- and NNN-Donor Ligands: π-Arene Coordination as a Persistent Structural Motif

Preparation and Magnetic Properties of Iron(3+) Spin-Crossover Complexes Bearing a Thiophene Substituent: Toward Multifunctional Metallopolymers

Group 10 Transition-Metal Complexes of an Ambiphilic PSB-Ligand: Investigations into η ³ ( BCC )-Triarylborane Coordination

Cationic ligands for Ag(I): Organometallic polymers versus unimolecular complexes

Ruthenium vinylidene and carbyne complexes containing a multifunctional tridentate ligand with a PNN donor set

Oxazoline chemistry. Part 12: A metal-mediated synthesis of DMU-212; X-ray diffraction studies of an important anti-cancer agent

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