Výsledky vyhledávání - "Nathan A. Owston"

Conversion of Primary Alcohols and Aldehydes into Methyl Esters by Ruthenium-Catalysed Hydrogen Transfer Reactions

Autor: Michael K. Whittlesey, Jonathan M. J. Williams, Nathan A. Owston, Alexandra J. Parker, Tracy D. Nixon

Publikováno v: Synthesis. 2009:1578-1581

Alcohols and aldehydes are oxidised to the corresponding methyl esters by reaction with methanol in the presence of crotono-nitrile as a hydrogen acceptor using a catalyst combination of Ru(PPh 3 ) 3 (CO)H 2 with xantphos.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::325962b84e321eaaa2f6caf5da40b652
https://doi.org/10.1055/s-0028-1088026

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The design of efficient and selective routes to pyridyl analogues of 3-oxo-3,4-dihydro-2H-1,4-(benzothiazine or benzoxazine)-6-carbaldehydes

Autor: Gerald Brooks, Timothy J. Miles, Neil D. Pearson, Alan Joseph Hennessy, David T. Davies, Graham Elgin Jones, Tony W. Peng, Nathan A. Owston, Roger Edward Markwell, Steven Dabbs

Publikováno v: Tetrahedron Letters. 51:5035-5037

This Letter describes the synthesis of challenging pyridyl analogues of 3-oxo-3,4-dihydro-2H-1,4-(benzothiazine or benzoxazine)-6-carbaldehydes. The six different routes described are high yielding, contain no major purification issues and have been

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d0b287ec281ac4dea8b90f6065c68cc1
https://doi.org/10.1016/j.tetlet.2010.07.095

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Ruthenium-catalysed conversion of oxime ethers into nitriles

Autor: Jonathan M. J. Williams, Naveen Anand, Nathan A. Owston, Alexandra J. Parker, Paul A. Slatford

Publikováno v: Tetrahedron Letters. 48:7761-7763

The conversion of oxime ethers into nitriles has been achieved under neutral conditions using Ru(CO)(PPh 3 ) 3 H 2 and the bidentate ligand Xantphos as the catalyst.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::cd3e290f00b535d5385ed6087d07f4eb
https://doi.org/10.1016/j.tetlet.2007.09.028

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ChemInform Abstract: New Directing Groups for Metal-Catalyzed Asymmetric Carbon-Carbon Bond-Forming Processes: Stereoconvergent Alkyl-Alkyl Suzuki Cross-Couplings of Unactivated Electrophiles

Autor: Francesco Tramutola, Gregory C. Fu, Ashraf Wilsily, Nathan A. Owston

Publikováno v: ChemInform. 43

Secondary alkyl bromides or chlorides bearing a carbamate, sulfonamide or sulfone group undergo nickel/chiral diamine-catalyzed alkyl—alkyl cross-coupling reactions with alkyl- or arylboranes to give the coupling products with up to 95% enantiosele

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1bd8681e61cc8e386f3191dc3a2c44cd
https://doi.org/10.1002/chin.201236027

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New Directing Groups for Metal-Catalyzed Asymmetric Carbon–Carbon Bond-Forming Processes: Stereoconvergent Alkyl–Alkyl Suzuki Cross-Couplings of Unactivated Electrophiles

Autor: Gregory C. Fu, Ashraf Wilsily, Francesco Tramutola, Nathan A. Owston

The ability of two common protected forms of amines (carbamates and sulfonamides) to serve as directing groups in nickel-catalyzed Suzuki reactions has been exploited in the development of catalytic asymmetric methods for cross-coupling unactivated a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cb4d3ad663483d10b017f4bb09aa9c8d
https://resolver.caltech.edu/CaltechAUTHORS:20200428-095145201

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ChemInform Abstract: Asymmetric Alkyl-Alkyl Cross-Couplings of Unactivated Secondary Alkyl Electrophiles: Stereoconvergent Suzuki Reactions of Racemic Acylated Halohydrins

Autor: Gregory C. Fu, Nathan A. Owston

Publikováno v: ChemInform. 42

Carbamate-protected racemic bromohydrins (II) and its homologue (VIII) are reacted with alkyl boranes to afford the products with high yields and excellent enantioselectivities.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::62068412743e5f7f49be1f712e951e30
https://doi.org/10.1002/chin.201106074

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ChemInform Abstract: The Design of Efficient and Selective Routes to Pyridyl Analogues of 3-Oxo-3,4-dihydro-2H-1,4-(benzothiazine or benzoxazine)-6-carbaldehydes

Autor: Gerald Brooks, Neil D. Pearson, Timothy J. Miles, Alan Joseph Hennessy, Tony W. Peng, Nathan A. Owston, Graham Elgin Jones, Roger Edward Markwell, Steven Dabbs, David T. Davies

Publikováno v: ChemInform. 42

In connection with a programme concerning the antibacterial medicinal chemistry, different routes are presented for the synthesis of aldehydes (V), (VIII), (XI), and (XV) which allow the preparation of multi-gram quantities.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f14f842f05f1c1c734c7cabfb875296f
https://doi.org/10.1002/chin.201102173

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Oxidation of primary alcohols to methyl esters by hydrogen transfer

Autor: Alexandra J. Parker, Jonathan M. J. Williams, Nathan A. Owston

Publikováno v: Chemical communications (Cambridge, England). (5)

The oxidation of alcohols in the presence of methanol has been achieved using a ruthenium catalyst with crotononitrile as the hydrogen acceptor.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4bdff4e664bcccfe6112f65ae722290e
https://pubmed.ncbi.nlm.nih.gov/18209810

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