Catalytic Hydroalkylation of Olefins by Stabilized Carbon Nucleophiles Promoted by Dicationic Platinum(II) and Palladium(II) Complexes
作者:Maria E. Cucciolito、Angela D’Amora、Aldo Vitagliano
DOI:10.1021/om1006787
日期:2010.11.22
The coordinated olefin in dicationic platinum(II) and palladium(II) complexes [M(PNP)(olefin)](SbF6)2 (M = Pt, Pd; PNP = 2,6-bis(diphenylphosphinomethyl)pyridine; olefin = ethylene, propylene) reacts with β-dicarbonyl compounds (pentane-2,4-dione and methyl-3-oxobutanoate). If the proton released after the nucleophilic attack is trapped by a base, stable σ-alkyl derivatives [(PNP)M-CH2-CH(R)CH(Ac)COR′]SbF6
二价铂(II)和钯(II)络合物中的配位烯烃[M(PNP)(烯烃)](SbF 6)2(M = Pt,Pd; PNP = 2,6-双(二苯基膦基甲基)吡啶;烯烃=乙烯,丙烯)与β-二羰基化合物(戊烷-2,4-二酮和3-氧代丁酸甲酯)反应。如果亲核攻击后释放的质子被碱捕获,则稳定的σ-烷基衍生物[(PNP)M-CH 2 -CH(R)CH(Ac)COR'] SbF 6(R = H,Me; R′= Me,OMe)形成;否则,在导致烷基化二羰基化合物的催化循环的速率确定步骤中,MCσ键可被质子裂解。β-二酮本质上比β-酮酯更具反应性,但在前者的催化反应中,在铂催化剂的情况下观察到了抑制作用。