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Alkenylzirconium reagents

The above studies illustrated that sp2-hybridized organozincs underwent direct addition to aldehydes rapidly, thus preventing the desired three-component couplings. However, alkenylzirconium reagents, derived from hy-... [Pg.23]

Alkenylzirconium reagents generated from alkynes and the Schwartz reagent react with aldimines under mild conditions in the presence of [RhCl(COD)]2 to give homoallylic amine derivatives (Equation (63)).418... [Pg.453]

Utilization of stereodefined alkenylalanes or alkenylzirconium reagents in palladium-catalyzed cross-coupling reactions greatly enhances the versatility of Negishi-type coupling reactions. These organometallics are readily available by hydroalumi-nation, carboalumination, and hydrozirconation of alkynes, respectively. [Pg.330]

Alkenylzirconium reagents Hydrozirconation of alkynes with Cp ZifHlCl followed by reaction with iodonium salts constitutes a method for synthesis of styrenes and enynes. In the latter case it can be seen that zirconium prefers attachment to the heterosubstituted carbon atom therefore, 1,1-difiinctionalized 1-alkenes are readily prepared, including those pairing Si/Se and Te/Te. ... [Pg.445]

Under the influence of (Ph3P)4Ni, o ,a-difluoro-p,7-unsaturated esters are formed from the reaction of alkenylzirconium reagents with bromodifluoroacetic esters. ... [Pg.299]

Catalytic couplings of enones and allc3mes involving alkyl transfer proceed efficiently with alkynyl tin, organozinc, or alkenylzirconium reagents... [Pg.369]

Scheme 1 Formation of alkyl- and alkenylzirconium reagents by the hydrozirconation of alkenes and alkynes... Scheme 1 Formation of alkyl- and alkenylzirconium reagents by the hydrozirconation of alkenes and alkynes...
See other pages where Alkenylzirconium reagents is mentioned: [Pg.1127]    [Pg.25]    [Pg.138]    [Pg.656]    [Pg.93]    [Pg.221]    [Pg.1118]    [Pg.656]    [Pg.656]    [Pg.15]    [Pg.383]    [Pg.369]    [Pg.117]    [Pg.126]    [Pg.383]    [Pg.458]    [Pg.265]   
See also in sourсe #XX -- [ Pg.13 ]

See also in sourсe #XX -- [ Pg.445 ]

See also in sourсe #XX -- [ Pg.13 ]

See also in sourсe #XX -- [ Pg.117 , Pg.126 ]



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Alkenylzirconiums

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