1,720,962 research outputs found
Synthesis of 5-Cyano-1,3-dioxoalkanes by Reaction of 1,3-Dicarbonyl Dianions with Bromoacetonitrile
No full text5-Cyano-1,3-dioxoalkanes were prepared by reaction of 1,3-dicarbonyl dianions with bromoacetonitrile
ChemInform Abstract: Olefin Cross-Metathesis of Alkenyl Epoxides with Allyl- and Vinyltrimethylsilane.
No full textChemInform Abstract: Stereoselective Synthesis and Palladium-Catalyzed Transformations of 2-Alkylidene-5-vinyltetrahydrofurans.
No full textSynthesis of 2-alkenyl-3-(alkoxycarbonyl)furans based on Feist-Benary cyclocondensation of (2,4-dioxobutylidene)phosphoranes with alpha-haloketones and alpha-chloracetaldehyde
No full text3-Acyl-2-alkenylfurans were prepared by "Feist-Benary cyclocondensation" of (2,4-dioxobutylidene) phosphoranes with chloracetaldehyde and alpha-haloketones and subsequent Wittig reactions
ChemInform Abstract: Efficient and Stereoselective Synthesis of Bicyclo[3.2.1]octan-8-ones: Synthesis and Palladium-Catalyzed Isomerization of Functionalized 2-Vinyl-2,3,3a,4,5,6-hexahydro-2,3-benzofurans.
No full textChemInform Abstract: Regio- and Diastereoselective Synthesis of 2-Alkylidenetetrahydrofurans by Domino SN/SN′ and SN/SN Reactions of 1,3-Dicarbonyl Dianions.
No full textEfficient and Stereoselective Synthesis of Bicyclo[3.2.1]octan-8-ones: Synthesis and Palladium-Catalyzed Isomerization of Functionalized 2-Vinyl-2,3,3a,4,5,6-hexahydro-2,3-benzofurans
No full textA new C,O-cyclodialkylation of dilithiated cyclic beta-keto esters and beta-keto sulfones with 1,4-dibromo-2-butene is reported which results in regio- and diastereoselective formation of 2-vinyl-2,3,3a,4,5,6-hexahydro-2,3-benzofurans. The could be efficiently transformed into functionalized bicyclo[3.2.1]octan-8-ones by a palladium-catalyzed rearrangement reaction. In case of sulfone derivatives, this rearrangement proceeds with high stereospecifity to give exclusively the endoconfigured diastereomers. The bicyclo [3.2.1]octane skeleton is present in a large number of pharmacologically important natural products
ChemInform Abstract: Chemo-, Regio- and Stereoselective Synthesis of 2-Alkylidene-5-hydroxymethyl-hydrofurans by Cyclization of 1,3-Dicarbonyl Dianions with 1-Bromo-2,3-epoxypropanes.
No full textDiversity‐Oriented Synthesis of 2,5‐Disubstituted Tetrahydrofurans Based on a “Cyclization‐Hydrogenation‐Substitution” Strategy
No full textA variety of (tetrahydrofuran-2-yl) acetates have been prepared based on hydrogenation and subsequent nucleophilic substitutions of 2-alkylidene-5-(hydroxymethyl)tetrahydrofurans. The latter are readily available by cyclization of 1,3dicarbonyl dianions ("free dianions") with epibromohydrin. (c) Wiley-VCH Verlag GmbH & Co
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