Tunable Ligand Effects on Ruthenium Catalyst Activity for Selectively Preparing Imines or Amides by Dehydrogenative Coupling Reactions of Alcohols and Amines
作者:Takafumi Higuchi、Risa Tagawa、Atsuhiro Iimuro、Shoko Akiyama、Haruki Nagae、Kazushi Mashima
DOI:10.1002/chem.201701342
日期:2017.9.18
l)methyl)pyrrolidine], in the presence of catalytic amounts of Zn(OCOCF3)2 and potassium bis(trimethylsilyl)amide (KHMDS). Our previously reported ruthenium complex, [Ru(OCOCF3)2(dppea)2] (8 a), was the catalyst precursor for the imine synthesis, whereas [Ru(OCOCF3)2(S)‐dppmp}2] (8 d), which was derived from the treatment of 6 d with Zn(OCOCF3)2 and characterized by single‐crystal X‐ray analysis,
在催化量的Zn(OCOCF 3)存在下,通过使用钌络合物[RuCl 2(dppea)2 ](6 a:dppea = 2-二苯基膦基乙胺),开发了从多种醇和胺中选择性合成亚胺的方法。)2和KO t Bu,而使用另一种钌络合物[RuCl 2 (S)-dppmp} 2 ] [ 6 d:(S)-dppmp =(S)-2-(((二苯基膦基)甲基)吡咯烷],在催化量的Zn(OCOCF 3)2和双(三甲基甲硅烷基)酰胺钾盐(KHMDS)。我们先前报道的钌络合物[Ru(OCOCF 3)2(dppea)2 ](8 a)是亚胺合成的催化剂前体,而[Ru(OCOCF 3)2 (S)-dppmp} 2 ](8 d),其源自用Zn(OCOCF 3)2处理6 d并通过单晶X射线分析表征,是形成酰胺的前催化剂。对照实验表明,锌盐起着用三氟乙酸根阴离子代替氯离子的作用。基于时程研究,Hammett图和氘标记实验,