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Showing 1 to 8 of 8 for “"Silyl Enol Ethers"”.
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Lewis Base Catalyzed Aldol Additions of Chiral Silyl Enol Ethers and Total Synthesis of Rk-397
… aldol additions was examined using chiral silyl enol ethers derived from hydroxyisobutyrate and hydroxybutyrate. Trichlorosilyl enolates derived from the chiral methyl and ethyl ketones were subjected to the Lewis base catalyzed conditions, and the intrinsic selectivity of these enolates …
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Cobalt stabilized gamma-chloroalkynones and alkynoates as gamma-carbonyl cation synthons.
… of 100 with silver salts in the presence of silyl enol ethers (102-104) generated 2-alkynyl-1,6-dicarbonyl compounds (134-149) in poor to good yields. Products of 101, with a non hydrogen substituent at the propargyl site, with 102 and 103 generated syn and anti diastereomers. The ratios of …
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Rhodium-Catalyzed Asymmetric Ring Opening of Oxabicyclic Alkenes and Palladium-Catalyzed Carbon-Halogen Bond Forming Reactions
… ARO of meso-oxabicyclic alkenes using silyl enol ethers and ketene acetals. In analogy to the Mukaiyama aldol reaction, a novel silyl migration occurs, enabling an in situ protection of the chiral alcohols obtained. Developing new reactivity from Heck-type carbopalladation processes …
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Synthetic Studies towards Opaliferin, a Tetracyclic Polyketide Metabolite
… (12). Successful preparation of advanced silyl enol ethers 406a,b from ketones 404a,b has laid a solid foundation for the research group to go on to complete the total synthesis of opaliferin (12) in the near future, based on the findings of this project.
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HYPERVALENT IODINE METHODS FOR CARBON–NITROGEN AND CARBON–CARBON BOND FORMATION
… We demonstrate the utility of β-pyridinium silyl enol ethers as a platform for direct α-arylation, and how the 2-iodo-aryl-α-arylated enones can be used to access diverse heterocyclic structures. Chapter 5 demonstrates our initial efforts towards the selective C2 or C3 carbon-nitrogen bond …
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Some chemistry of chromenes and chromanones
… involving the rearrangement of aryl propargyl ethers has been modified such that the chromene can be prepared directly by reaction of an alkynol with a suitably activated phenol at an alumina surface, without the need to prepare the intermediate ether. The addition of halogens and of …
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I. Progress Toward Leiodelide A II. Palladium-Catalyzed Reactions of Enol Ethers
… palladium-catalyzed oxidation of alkyl enol ethers to ¿¿,¿¿-unsaturated aldehydes was developed. The reaction utilizes palladium loadings far lower than those used in traditional Saegusa oxidations of silyl enol ethers. Despite a number of published modifications of the Saegusa oxidation …
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Cobalt(II) Catalyzed Asymmetric Hydrovinylation of Alkyl- and Trialkylsilyloxy-1,3-Dienes
… to include the 1-vinylcycloalkene and 2-silyloxy-1,3-diene classes of compounds. Also presented in this thesis is the asymmetric hydrovinylation of the 1-vinylcycloalkenes and 2-trialkylsilyloxy-1,3-dienes, and efforts towards the derivitization of the products of these reactions.