A New Platinum Complex Catalyzed Reaction Involving Nucleophilic Substitution at the Central Carbon Atom of the π-Allyl Ligand
摘要:
The reaction of 2-chloro-allyl acetate with sodium ethyl acetoacetate in the presence of a platinum(O) complex gave furan derivatives. The key feature of this-new platinum-catalyzed reaction is the nucleophilic substitution at the central carbon atom of pi-allyl complexes. The regioselectivity of the nucleophilic attacks (central or terminal) is dependent on the pK(a) of the nucleophile. In addition, a labeling experiment revealed that a rapid syn-anti isomerization of the (pi-allyl) platinum complexes occurs.
The palladium-catalyzed hydroalkylation of 2-fluoroallyl acetates with the malonate anion and hydride was developed. The reaction proceeded through the C–F bond activation and provided vinylmalonic acid ester derivatives by the regioselective substitutions with the carbon nucleophile and hydride.
The double substitution of 3-aryl-2-fluoroallyl acetates with phenols has been accomplished; the Pd(PPh3)(4) catalyst system has effectively catalyzed the reaction to afford the doubly substituted product via carbon-fluorine bond activation.
Palladium-Catalyzed Double Alkylation of 3-Aryl-2-fluoroallyl Esters with Malonate Nucleophiles through the Carbon–Fluorine Bond Cleavage
The alkylation of (Z)-3-aryl-2-fluoroallyl acetate with the malonate anion by the [Pd(C3H5)(cod)]BF4/2,2'-bpy catalyst proceeds through the carbon fluorine bond cleavage, and 2 equiv of the malonate nucleophile was introduced to the allyl substrate.