Results 101 to 110 of about 26,606 (255)
Diastereoselective Synthesis of β-Hydroxyketones
Natural Product Communications, 2008 The diastereoselective synthesis of 2,4-dibromo-3-hydroxy-1,3-diphenylbutan-1-one [ 4 ( a-a’ )]; 2,4-dibromo-3-hydroxy-1,3-di [( p -chloro)phenyl]butan-1-one [ 5 ( a-a’ )] and 2,4-dibromo-3-hydroxy-1,3-di[( p -phenyl)phenyl]butan-1-one [ 6(a-a’) ] using (
Teresa Mancilla Percino +2 more
doaj +1 more source
Chemistry – A European Journal, EarlyView.Cyclopropylamines have emerged as powerful photocatalytic building blocks. Upon light‐induced single‐electron oxidation, they undergo strain‐release ring opening to generate distonic iminium radicals that enable diverse transformations, including ring‐opening functionalization, formal [3 + 2] cycloadditions, radical cascades, and asymmetric bond ...
Maria Chiara Cabua +3 more
wiley +1 more source
The synthesis of the 2,3-difluorobutan-1,4-diol diastereomers
Beilstein Journal of Organic Chemistry, 2017 The diastereoselective synthesis of fluorinated building blocks that contain chiral fluorine substituents is of interest. Here we describe optimisation efforts in the synthesis of anti-2,3-difluorobutane-1,4-diol, as well as the synthesis of the ...
Robert Szpera +4 more
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Molecules, 2017 A highly diastereoselective cyclopropanation of cyclic enones with sulfur ylides was developed under catalyst-free conditions, producing multifunctional spirocyclopropanes in generally excellent yields (up to 99% yield and >99:1 d.r.).
Yi Li +9 more
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Selective Synthesis of Functionalized, Tertiary Silanes by Diastereoselective Rearrangement−Addition
, 2016 Treatment of hydroxy-substituted silyl epoxides with Grignard reagents induces a 1,2-carbon shift to reveal α-silyl aldehydes, which are trapped by highly diastereoselective addition reactions of the Grignard reagent.
Zachary T. Ball (1819597) +2 more
core +1 more source
Chemistry – A European Journal, EarlyView.Charge and orbital control represent fundamental principles in organic chemistry. In this study, these principles are applied to the aldol reactions of a cyclic Ge‐dienolate. By systematically tuning the charge and orbital distributions of the Ge‐dienolates and their aldehyde reaction partners, regio‐ and stereoselective access to three distinct aldol ...
Taishi Nojima +2 more
wiley +1 more source
A concise enantioselective synthesis of the guaiane sesquiterpene (−)-oxyphyllol
Beilstein Journal of Organic Chemistry, 2013 (−)-Oxyphyllol was prepared in only 4 steps from an epoxy enone that already served as an intermediate for the total synthesis of the anticancer guaiane (−)-englerin A.
Martin Zahel, Peter Metz
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Diastereoselective Cobalt-Catalyzed Aldol and Michael Cycloreductions
, 2016 Diastereoselective Cobalt-Catalyzed Aldol and Michael ...
Michael J. Krische (1324470) +3 more
core +1 more source
Chiral Pyrazolinylidene Complexes for Asymmetric Catalysis
Chemistry – A European Journal, EarlyView.The synthesis and application of pyrazolin‐5‐ylidene NHC chiral‐at‐ruthenium catalysts is reported. The strong donating pyrazolin‐5‐ylidene ligands led to highly electron rich ruthenium complexes, which showed excellent catalytic activity and enantioselectivity in the intramolecular aziridination of an alkene.
Felix Möller +6 more
wiley +1 more source
The Mechanism of Visible‐Light Photochemical Rearrangements of Conjugated Amide Enolates
Chemistry – A European Journal, EarlyView.Visible light irradiation of extended enolates of N‐benzylamides leads to homolytic C─N Bond cleavage, generating a biradical. Computational and mechanistic studies suggest rapid radical recombination within a solvent cage to give either ring‐expanded or rearranged products. ABSTRACT Deprotonation of conjugated amides forms colored solutions of lithium
James Mortimer +3 more
wiley +1 more source