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Allyl Derivatives (allyl + derivative)

Distribution by Scientific Domains
Chemistry100%

Selected Abstracts

ChemInform Abstract: Synthesis of Pyrrolo[2,3-a]pyrrolizine and Pyrrolizine[2,3-a]pyrrolizine Derived from Allyl Derivatives of Baylis,Hillman Adducts Through Intramolecular 1,3-Dipolar Cycloaddition.

CHEMINFORM, Issue 35 2009
Subban Kathiravan
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

ChemInform Abstract: A Facile Synthesis of Chromeno[4,3-b]pyrroles Derived from Allyl Derivatives of Baylis,Hillman Adducts Through Intramolecular 1,3-Dipolar Cycloaddition Using Ultrasonication.

CHEMINFORM, Issue 24 2008
Ekambaram Ramesh
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

Multicomponent Reactions of Allenes, Diaryl Diselenides, and Nucleophiles in the Presence of Iodosobenzene Diacetate: Direct Synthesis of 3-Functionalized-2-arylselenyl Substituted Allyl Derivatives.

CHEMINFORM, Issue 20 2007
Lei Yu
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source]

Efficient Functionalisation of Cubic Monovinylsilsesquioxanes via Cross-Metathesis and Silylative Coupling with Olefins in the Presence of Ruthenium Complexes

ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 16 2009
Patrycja
Abstract Monovinylheptaisobutylsilsesquioxane undergoes efficient cross-metathesis and silylative coupling with styrenes. Allyl derivatives were successfully tested in cross-metathesis in the presence of first generation Grubbs' catalyst, while heteroatom-substituted vinyl derivatives (vinyl ethers, 9-vinylcarbazole) efficiently undergo silylative coupling catalysed by ruthenium hydride complexes. Both reactions proceed highly stereoselectively and lead to nearly quantitative formation of E isomers. Only when vinyl ethers are used does the reaction lead to a mixture of stereoisomers. Atmospheric pressure photoionisation has been successfully used for recording mass spectra of the functionalised silsesquioxanes. [source]

Efficient Solvent-Free Robinson Annulation Protocols for the Highly Enantioselective Synthesis of the Wieland,Miescher Ketone and Analogues

ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 14-15 2009
Ben Bradshaw
Abstract A highly efficient (93% overall yield) and enantioselective (94% ee) synthesis of the Wieland,Miescher ketone (10-g scale) through a solvent-free Robinson annulation procedure is reported. The process involves only 1,mol% triethylamine as the base in the initial Michael process and the organocatalyst N -tosyl-(Sa)-binam- L -prolinamide (2,mol%) and benzoic acid (0.5,mol%) for the intramolecular aldol process. This green protocol is applied to a wide range of valuable building block analogues of the Wieland,Miescher ketone (10 examples). Among these, a noteworthy compound for terpene synthesis is the 8a-allyl derivative, which is prepared in 93% yield and 97% ee in a process allowing the recovery and reutilization of the organocatalyst. Furthermore, a one-pot, two-step process has also been developed. [source]

Catalytic Dicyanative 5- exo- and 6- endo -Cyclization Triggered by Cyanopalladation of Alkynes

ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 5 2010
Shigeru Arai
Abstract A stereoselective dicyanative 5- exo- and 6- endo -cyclization using various enynes has been investigated. The mode of cyclization is critically controlled by the structure of the substrates. For example, N -allyl derivatives prefer 5- exo -cyclization, while methacryloyl amides are transformed to the corresponding lactams with tetra -substituted carbons at the alpha-position via 6- endo -cyclization. Both reactions include syn -cyanopalladation to carboncarbon triple bonds in the initial step, and sequential cyclization followed by reductive elimination in one operation enables the construction of the highly functionalized nitrogen heterocycles. The scope of suitable substrates and a proposed mechanism are also described. [source]