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Showing 1 to 10 of 10 for “"stannane"”.
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Dynamics and Catalytic Resolution of Selected Chiral Organolithiums
… and asymmetric synthesis of a precursor stannane as ways to access enantioenriched organolithium compounds for use in asymmetric synthesis. Since certain electrophiles consume the chiral ligand, it is desirable to render this process catalytic in the chiral ligand.</p> <p>As part of a …
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Generating structural diversity in \(\alpha\)[alpha],\(\alpha\)[alpha]-difluoromethyl ketones
… with a range of aryl, heteroaryl and vinyl stannanes. Due to the difficulties with cleavage of this protecting group, the synthesis and potential application of an \(N\)-ethyl-\(N\)-(2-methylallyl)carbamate has been studied. A 2-methoxyethoxymethyl (MEM) protecting group strategy proved very …
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Studies towards the total synthesis of Antascomicin A.
… are also presented. The coupling of a model stannane with the novel C30-C33 tartrate derived, butane-2,3-diacetal protected aldehyde under various Lewis acid conditions is reported. Progress towards the synthesis of conduritol systems featuring studies on the ring-closing metathesis reaction …
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Some uses of tin compounds in organic synthesis.
… a regio- and stereo-specific synthesis of allyl stannanes. s-stannyl ester enolates were treated with aldehydes to give alcol products with fairly good stereoselectivity: (~) and (~) enolates gave major products with different aldol relative stereochemistry. These aldols could be converted to s - …
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Asymmetrische Totalsynthese von 16(S)-Iloprost und 3-Oxa-16(S)-Iloprost mittels der Azoen-Strategie
… and its coupling with a monolithiated stannane with formation of stannylated keton. The diastereoselective reduction of the ketone was performed by using catecholborane and an oxazaborolidine catalyst. One of the major key steps is the conjugate 1,4 addition of an C13-C20 organocopper …
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Advances in the Stille reaction and new methods for continuous flow Pd-catalyzed C-N bond forming reactions
… of aryl chlorides with a range of tributylarylstannanes to produce the corresponding biaryl compounds in good to excellent yields (61-98%) in short reaction times (4 h). Palladium(II) acetate [Pd(OAc)2] and XPhos in a 1:1.1 ratio were milled into a fine powder that was used as pre-catalyst for …
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Adventures in polyene chemistry
… tetrachloroethylene and tributyl(vinyl) stannane. This approach also allows access to a variety of substituted tetravinylethylenes and, as such, represents the first general method of preparation for this family. Tetravinylethylene is smoothly converted into …
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Adventures in polyene chemistry
… tetrachloroethylene and tributyl(vinyl) stannane. This approach also allows access to a variety of substituted tetravinylethylenes and, as such, represents the first general method of preparation for this family. Tetravinylethylene is smoothly converted into …
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Further investigations into the mechanism of the o-directed free radical hydrostannation of alkyl and aryl acetylenes
This project demonstrates the extensive further investigations that have been conducted into the O-directed free radical hydrostannation that were required to lay to rest the debate regarding the exact mechanistic path by which this reaction was occurring due to multiple contradicting mechanisms …
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Neue organometallisch substituierte Alkine, Alkene und Metallacyclen - Anwendung der Multikern-NMR-Spektroskopie
… über die Synthese neuer Mono- und Dialkinylstannane. Diese wurden mit gängigen Methoden (NMR, IR, MS, teils Röntgenstrukturanalyse) charakterisiert und ihre Anwendung in 1,1-Organoborierungsreaktionen wurde gezeigt. Die Alkinylstannane können in guten bis sehr guten Ausbeuten (teilweise …