Palladium aminopyridine complexes catalyzed selective benzylic C–H oxidations with peracetic acid
作者:Dmitry P. Lubov、Oleg Yu. Lyakin、Denis G. Samsonenko、Tatyana V. Rybalova、Evgenii P. Talsi、Konstantin P. Bryliakov
DOI:10.1039/d0dt02247k
日期:——
complexes with tripodal ligands of the tpa family (tpa = tris(2-pyridylmethyl)amine) have been synthesized and X-ray characterized. These complexes efficiently catalyze benzylic C–H oxidation of various substrates with peracetic acid, affording the corresponding ketones in high yields (up to 100%), at <1 mol% catalyst loadings. Complex [(tpa)Pd(OAc)](PF6) with the least sterically demanding ligand tpa demonstrates
已经合成了四种具有tpa家族三足配体的钯(II)配合物(tpa =三(2-吡啶基甲基)胺)并进行了X射线表征。这些配合物可以有效地催化过氧乙酸作用于各种底物的苄基CH氧化,在<1 mol%的催化剂负载量下,以高收率(最高100%)提供相应的酮。具有最低空间要求的配体tpa的复合物[(tpa)Pd(OAc)](PF 6)显示出最高的底物转化率和酮选择性。初步的力学数据提供了证据,证明了金属配合物介导的限速苄基CH键被缺电子的氧化剂裂解。