β-Substituted Alkenyl Heteroarenes as Dipolarophiles in the Cu(I)-Catalyzed Asymmetric 1,3-Dipolar Cycloaddition of Azomethine Ylides Empowered by a Dual Activation Strategy: Stereoselectivity and Mechanistic Insight
作者:Xin Chang、Yuhong Yang、Chong Shen、Kun-Shan Xue、Zuo-Fei Wang、Hengjiang Cong、Hai-Yan Tao、Lung Wa Chung、Chun-Jiang Wang
DOI:10.1021/jacs.0c12911
日期:2021.3.10
asymmetric 1,3-dipolarcycloaddition of azomethineylides. This reaction furnishes a large array of multistereogenic heterocycles incorporating both the biologically important pyrrolidine and heteroarene skeletons in good yields with exclusive diastereoselectivity and excellent enantioselectivity. Our extensive density functional theory (DFT) calculations proposed a working model to explain the origin of the
偶氮甲碱叶立德与各种缺电子烯烃的催化不对称 1,3-偶极环加成反应为有机合成中制备对映体富集的吡咯烷提供了最直接的方案。然而,在这样的协议中使用共轭链烯基杂芳烃作为偶极体来提供一类在药物化学中特别重要的分子仍然是一个巨大的挑战。在此,我们报告了各种 β-取代的烯基杂芳烃,在没有强吸电子取代物的情况下挑战内部烯烃底物,首次成功地用作偶极试剂在 Cu (I) 催化的偶氮甲碱的不对称 1,3-偶极环加成反应中叶立德。该反应提供了大量多立体杂环,以良好的收率结合了生物学上重要的吡咯烷和杂芳烃骨架,具有独特的非对映选择性和出色的对映选择性。我们广泛的密度泛函理论 (DFT) 计算提出了一个工作模型来解释立体化学结果的起源,并阐明了金属对偶极子和亲偶极子底物的罕见双重激活/配位,其中空间体积大、刚性和单齿亚磷酰胺具有三重同轴手性的配体在金属中心周围提供有效的手性袋中起着关键作用,从而产生高对映选择性。亲偶极底物中的杂原子与
Quinoxaline-specific enantioselective sulfa-michael reaction catalyzed by chiral phosphoric acid
作者:Xiongfei Deng、Shiqi Zhang、Hesen Huang、Xin Cui、Zhuo Tang、Guangxun Li
DOI:10.1016/j.cclet.2023.108145
日期:2023.1
Highly enantioselective sulfa-Michael additions (SMA) between 2-alkenyl quinoxalines and aromatic thiols are accomplished using a low loading of chiralphosphoricacid catalyst (1 mol%). It was confirmed by an investigation of a lot of azaarenes that the two C=N units of quinoxalines are indispensable for controlling the reaction enantioselectivities. A series of non-terminal 2-alkenes substituted
Enantioselective Copper-Catalyzed Hydrophosphination of Alkenyl Isoquinolines
作者:Qingjing Yang、Jian Zhou、Jun Wang
DOI:10.1039/d2sc06950d
日期:——
An enantioselective hydrophosphination of alkenyl isoquinolines is developed by using a copper-chiral diphosphine ligand catalyst. It provides a direct and atom-efficient approach to prepare a variety of chiral phosphines with an isoquinoline unit in good yields and high enantioselectivities. In addition, these chiral phosphine products are useful bidentate P,N-ligands which showed potential application
Palladium-catalyzed external-oxidant-free coupling reactions between isoquinoline/quinoline N-oxides with olefins
作者:Tao Guo、Yu Liu、Yun-Hui Zhao、Pan-Ke Zhang、Shu-Lei Han、Hong-Min Liu
DOI:10.1016/j.tetlet.2016.07.058
日期:2016.8
A convenient and efficient approach for the synthesis of 1-alkenylisoquinolines and 2-alkenylquinolines was developed via palladium-catalyzed coupling reactions between isoquinoline/quinoline N-oxides with olefins under external-oxidant-free conditions. Biological evaluation revealed that some of the obtained 1-alkenylisoquinolines exhibited in vitro antiproliferative activities on human-derived prostate