Kinetics and Mechanisms of the Gold-Catalyzed Hydroamination of Axially Chiral 1-Aryl-1,2-butadienes with Aniline
作者:Robert J. Harris、Kohki Nakafuku、Robert G. Carden、Jacob C. Timmerman、Ross A. Widenhoefer
DOI:10.1021/acs.organomet.2c00354
日期:2022.10.10
2-butadienes (R)-(4-C6H4R)C(H)=C=C(H)Me [R = Ph (1a), OMe (1b)] with aniline catalyzed by (IPr)AuOTf have been investigated employing a combination of kinetic and stereochemical analyses and in situ spectroscopy of catalytically active mixtures. These experiments were consistent with mechanisms involving essentially irreversible displacement of aniline from [(IPr)Au(NH2Ph)]+ by allene (R)-1 to form the enantiomerically
对映体富集的轴向手性 ( R )-1- aryl -1,2-butadienes ( R )-(4-C 6 H 4 R)C(H)=C=C(H)Me 的加氢胺化机理 [ R = Ph ( 1a ), OMe ( 1b )] 已通过结合动力学和立体化学分析以及催化活性混合物的原位光谱研究了由 (IPr)AuOTf 催化的苯胺。这些实验与涉及苯胺从 [(IPr)Au(NH 2 Ph)] +被丙二烯 ( R )- 1以形成对映体富集的金-π-丙二烯中间体 (R )-(IPr)Au[η 2 -( R )-ArC(H)=C=C(H)Me]} + [( R )- I ],然后进行单分子立体突变形成外消旋金-π-丙二烯中间体rac - I。中间体rac - I依次进行丙二烯置换形成外消旋丙二烯rac - 1或 C-N 键形成/原型去氧化形成外消旋 ( E )- N -(4-aryl-3-buten-2-yl)aniline