Allene–alkyne cross-coupling for stereoselective synthesis of substituted 1,4-dienes and cross-conjugated trienes
نویسندگان
چکیده
منابع مشابه
On the Diels-Alder dimerisation of cross-conjugated trienes.
The first general synthesis of 1-substituted [3]dendralenes has led to the discovery that conjugating groups significantly enhance the rate of Diels-Alder dimerisation relative to both the parent [3]dendralene and to other substituted systems.
متن کاملChemoselective construction of substituted conjugated dienes using an olefin cross-metathesis protocol.
[Reaction: see text] Various substituted conjugated dienes have been made by olefin cross-metathesis. Using either electronic or steric "protection," one of the olefins of the conjugated diene was deactivated relative to the other for cross-metathesis. The reactions proceed with very high chemoselectivity and, when steric deactivation is used, very high diastereoselectivity.
متن کاملSynthesis of cross-conjugated trienes by rhodium-catalyzed dimerization of monosubstituted allenes
A rhodium(I)/dppe catalyst promoted dimerization of monosubstituted allenes in a stereoselective manner to give cross-conjugated trienes, which are different from those obtained by a palladium catalyst.
متن کاملGold(I)-catalysed synthesis of conjugated trienes.
Gold(I)-catalysed reaction between cyclopropenes and furans produces functionalised conjugated trienes. The reaction is mild, facile and proceeds with very low catalyst loadings.
متن کاملRegio- and stereoselective synthesis of 1,4-dienes.
Titanocene(II)-promoted cross-coupling between (Z)-alkenyl methyl sulfones and terminal allenes produced 1,4-dienes regioselectively via the formation of 2-alkylidenetitanacyclopentanes. Preferential formation of E,Z-dienes was observed in the reaction using aryl-, amino-, and phosphinylallenes.
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ژورنال
عنوان ژورنال: Tetrahedron
سال: 2008
ISSN: 0040-4020
DOI: 10.1016/j.tet.2008.02.015