Tuning the regioselectivity of (benzimidazolylmethyl)amine palladium(II) complexes in the methoxycarbonylation of hexenes and octenes
作者:Thandeka A. Tshabalala、Stephen O. Ojwach
DOI:10.1007/s11243-018-0222-8
日期:2018.5
of N-(1H-benzoimidazol-2-ylmethyl-2-methoxy)aniline (L1) and N-(1H-benzoimidazol-2-ylmethyl-2-bromo)aniline (L2) with p-TsOH, Pd(AOc)2 and two equivalents of PPh3 or PCy3 produced the corresponding palladium complexes, [Pd(L1)(OTs)(PPh3)] (1), [Pd(L2)(OTs)(PPh3)] (2) and [Pd(L1)(OTs)(PCy3)] (3), respectively, in good yields. The new palladium complexes 1–3 and the previously reported complexes [Pd(L1)ClMe]
N-(1H-苯并咪唑-2-基甲基-2-甲氧基)苯胺 (L1) 和 N-(1H-苯并咪唑-2-基甲基-2-溴)苯胺 (L2) 与 p-TsOH、Pd(AOc) 的反应2 和两当量的 PPh3 或 PCy3 产生相应的钯配合物,[Pd(L1)(OTs)(PPh3)] (1), [Pd(L2)(OTs)(PPh3)] (2) 和 [Pd(L1) )(OTs)(PCy3)] (3) 分别具有良好的产率。新的钯配合物 1-3 和先前报道的配合物 [Pd(L1)ClMe] (4) 和 [Pd(L2)ClMe] (5) 在末端和内烯烃的甲氧基羰基化中提供了活性催化剂,以产生支链和直链酯. 研究并报道了复杂结构、膦衍生物的性质、酸促进剂和烯烃底物对催化活性和选择性的影响。