The title reaction in the presence of a catalytic amount of tetrakis(triphenylphosphine)palladium(0) affords alkylative coupling products in good to excellent yields in 1,2-dichloroethane at room temperature. This coupling reaction under C(sp2)–O cleavage proceeds stereospecifically. The reaction does not affect a coexisting vinyl sulfide group. This feature enables 1,2- and 1,3-carbonyl transposition
Carboncarbon bond formation by cross-coupling of enol phosphates with organoaluminium compounds catalyzed by palladium(O) complex
作者:Kazuhiko Takai、Koichiro Oshima、Hitosi Nozaki
DOI:10.1016/0040-4039(80)80120-1
日期:1980.1
Trialkylaluminium-mediated alkylation of enolphosphates under the CObond cleavage is performed stereospecifically in the presence of a catalytic amount of Pd(PPh3)4. Alkenylation and alkynylation are also described.
Keto carbonyl 1,2- and 1,3-transpositions with and without alkylation of the substrate are described together with ketone synthesis from thiocarboxylic S-ester.
We have developed an alternative route to the azatricyclic core skeleton of FR901483 based on vinylation at the bridgehead position of 2-azabicyclo[3.3.1]nonane via an anti-Bredt iminiumion using vinylaluminum reagents.
An efficient synthesis of 1,3(E),5(Z), 1,3(E),5(E) and 1,3(Z),5(Z)-trienes: Application to the synthesis of galbanolenes and (9Z,11E)-9,11,13-tetradecatrien-1-yl acetate
The (Pd-Cu)-catalyzed reactions of trimethylsilyl acetylene with (E) or (Z)-chloroenynes, or 1-chloro-(1E,3E)-dienes, followed by desilylation and zinc-reduction of the triple bonds led respectively to (3E,5Z), (3Z,5Z) and (3E,5E)-trienes. Application to the syntheses of galbanolenes and (9Z,11E)-9,11,13-tetradecatrien-1-ylacetate has been realized.