过渡金属催化剂的配体调节以实现烯烃加氢官能化的最佳反应性和选择性是合成有机化学中的基本挑战。加氢氨基烷基化是一种使用烯烃将胺烷基化的原子经济方法,对于制药、农业化学和精细化工行业的胺合成特别重要。然而,现有的方法通常需要特定的底物组合来实现精确的区域选择性和立体选择性,这限制了它们的实际应用。目前尚不存在允许从相同起始材料进行区域差异氢氨烷基化、控制区域化学和立体化学结果的方案。在此,我们报道了一种配体控制的、区域发散的镍催化的未活化烯烃与N-磺酰胺的氢氨基烷基化反应。该反应以胺脱氢开始,并涉及氮杂镍环中间体。三叔丁基膦促进支化区域选择性和顺式非对映选择性,而乙基二苯基膦实现线性选择性,产生具有相反方向的区域异构体。对多种单齿膦配体的系统评估揭示了不同的区域选择性悬崖,并且配体空间描述符% V bur ( min )被确立为将配体结构与区域选择性相关联的预测参数。计算研究支持了实验结果,为区域选择性的起源提供了机制见解。
<i>α</i>‐C−H Arylation of <i>N</i>‐Sulfonyl Amines by Dual Palladium Catalysis
作者:Yu‐Cheng Liu、Hang Shi
DOI:10.1002/cctc.202300392
日期:2023.6.9
α-arylated amines from simple linear N-sulfonyl amines and aryl boroxines utilizing dual palladium catalysis involving amine dehydrogenation. Bromobenzene serves as a hydride acceptor, and the ensuing imineintermediate undergoes a novel umpolung arylation. Given the wide availability of primaryamines, this method can be expected to be useful for the synthesis of structurally complex amines with varied
Reactivity of Cage-Like Amines toward p-Toluenesulfonyl Chloride and Diphenyl Chlorophosphate in Acetonitrile
作者:Yu. S. Sadovskii、T. N. Solomoichenko、A. O. Kas'yan、E. A. Golodaeva、S. V. Anikanova、L. I. Kas'yan、V. A. Savelova
DOI:10.1023/b:rujo.0000034909.58849.e9
日期:2004.1
The nucleophilic reactivity of amines of the norbornane, norbornene, and adamantane series toward p-toluenesulfonyl chloride and diphenyl chlorophosphate in acetonitrile at 25degreesC is determined mainly by the steric factor. Parameters characterizing spatial accessibility of the reaction center in the amine molecule have been determined. Cage-like substituents show no appreciable effect on the amine reactivity, as compared to common alkyl groups.