Copper-Catalyzed Stereospecific C–S Coupling Reaction of Enantioenriched Tertiary Benzylic Amines via in Situ Activation with Methyl Triflate
作者:Wenlong Jiang、Nutao Li、Lihong Zhou、Qingle Zeng
DOI:10.1021/acscatal.8b03032
日期:2018.11.2
1-(thiophen-2-yl)ethanamine), and amino acid esters containing a benzylamine moiety, are highly efficient substrates, and their chirality is efficiently transferred to the products (94–99% ee). The absolute configurations of the products are predictable and follow the pattern of SN2-type substitutions; an inversion of the absolute configuration of the tertiary amines occurs during the C–S coupling reaction. Not only
一锅方案,可通过无配体,铜催化的巯基与对映体富集的叔苄基胺的无配位铜催化立体有规C-S偶联反应,合成高度对映纯的苄基硫代醚,硫代乙酸酯和砜(94-99%ee)开发了三氟甲磺酸甲酯的活化作用。各种对映体富集的叔苄基胺,包括1-芳基烷基胺,1-四氢萘基乙胺,杂环胺(例如1-(噻吩-2-基)乙胺)和含有苄基胺部分的氨基酸酯,都是高效的底物,它们的手性为有效地转移到产品中(94–99%ee)。产品的绝对配置是可预测的,并遵循S N的模式2型替代;在CS偶联反应中,叔胺的绝对构型发生了反转。不仅各种烯烃,芳烃和杂芳硫醇都适用于此C-S偶联反应,而且硫代乙酸钾和苯基亚磺酸钠也适用。根据实验结果提出了一个合理的机制。