Atroposelective Synthesis of Axially Chiral 4-Aryl α-Carbolines via <i>N</i>-Heterocyclic Carbene Catalysis
作者:Rui Ma、Xiaoxue Wang、Qiaoyu Zhang、Lei Chen、Jian Gao、Jie Feng、Donghui Wei、Ding Du
DOI:10.1021/acs.orglett.1c01221
日期:2021.6.4
functional theory calculations were also conducted to illuminate the key factors for controlling the origin of the enantioselectivity. This strategy not only provides an efficient pathway to access axially chiral α-carboline atropisomers but also offers a novel catalytic enantioselective mode for the construction of axially chiral heterobiaryls by using NHC-bound alkynyl acylazoliums.
轴向手性 4-芳基 α-咔啉骨架的第一个催化不对称结构是通过N-杂环卡宾 (NHC) 催化的 4-硝基苯基 3-芳基丙炔酸酯与 2-磺酰氨基二氢吲哚的 atroposelective 形式 [3 + 3] 环化完成的。标题化合物的合成效用已通过各种后期结构修改得到证明。还进行了密度泛函理论计算,以阐明控制对映选择性起源的关键因素。该策略不仅提供了获得轴向手性 α-咔啉阻转异构体的有效途径,而且还提供了一种新型催化对映选择性模式,用于通过使用 NHC 结合的炔基酰基唑鎓构建轴向手性杂联芳基。