Cu(I)-Catalyzed Regio- and Stereoselective [6 + 3] Cycloaddition of Azomethine Ylides with Tropone: An Efficient Asymmetric Access to Bridged Azabicyclo[4.3.1]decadienes
摘要:
An unprecedented Cu(I)-catalyzed asymmetric [6 + 3] cycloaddition of tropone with azomethine ylides was reported, which performs well over a broad scope of substrates and offers a unique and facile access to the synthetically useful bridged azabicyclo[4.3.1]decadiene derivatives in good yields with high levels of diastereoselectivities and enantioselectivities under mild conditions.
Silver(I)-Catalyzed Enantioselective Desymmetrization of Cyclopentenediones: Access to Highly Functionalized Bicyclic Pyrrolidines
作者:Hua-Chao Liu、Kang Liu、Zhi-Yong Xue、Zhao-Lin He、Chun-Jiang Wang
DOI:10.1021/acs.orglett.5b02810
日期:2015.11.6
A highly enantioselectivedesymmetrization of prochiral cyclopentenediones via Ag(I)-catalyzed asymmetric 1,3-dipolar cycloaddition of azomethine ylide has been developed successfully. The methodology performs well over a broad scope of substrates, which provides facile access to a series of highly functionalized bicyclic pyrrolidine/cyclopentane derivatives in good to high yields with excellent stereoselectivities
Silver(I)-Catalyzed Atroposelective Desymmetrization of <i>N</i>-Arylmaleimide via 1,3-Dipolar Cycloaddition of Azomethine Ylides: Access to Octahydropyrrolo[3,4-<i>c</i>]pyrrole Derivatives
作者:Hua-Chao Liu、Hai-Yan Tao、Hengjiang Cong、Chun-Jiang Wang
DOI:10.1021/acs.joc.6b00396
日期:2016.5.6
has been established successfully, affording a facileaccess to a series of biologically important and enantioenriched octahydropyrrolo[3,4-c]pyrrole derivatives in generally high yields (up to 99%) with excellent levels of diastereo-/enantioselectivities (up to 99% ee, >20:1 dr). Subsequent transformations led to fascinating 2H-pyrrole and polysubstituted pyrrole compounds without loss of stereoselectivity
已经成功地建立了通过原位生成的偶氮甲亚胺的1,3-偶极环加成反应的N-(2-叔丁基苯基)马来酰亚胺的高效Ag(I)催化的对位选择性脱对称,为人们提供了一系列重要的生物学上的便捷途径和对映体富集的八氢吡咯并[3,4- c ]吡咯衍生物,通常收率高(高达99%),非对映/对映选择性极好(ee高达99%,> 20:1 dr)。随后的转化导致令人着迷的2 H-吡咯和多取代的吡咯化合物,而不会失去立体选择性。生成的手性轴的绝对构型已明确标识为(M)通过单晶X射线衍射分析。此外,基于全面的实验结果和一种环加合物的绝对构型,立体选择性的起源被认为归因于手性配体和叔丁基的庞大的PPh 2基团造成的空间拥挤。N-(2-叔丁基苯基)马来酰亚胺的基团。手性配体的NH 2基团与N-(2-叔丁基苯基)马来酰亚胺的羰基之一之间可能的氢键相互作用被认为有助于稳定过渡态。
Asymmetric construction of fluorinated imidazolidines via Cu(i)-catalyzed exo′-selective 1,3-dipolar cycloaddition of azomethine ylides with fluorinated imines
作者:Qing-Hua Li、Liang Wei、Xuan Chen、Chun-Jiang Wang
DOI:10.1039/c3cc43025a
日期:——
Expedient access to optically active fluorinated 2,4-trans-imidazolidines was successfully developed via Cu(I)-catalyzed exo'-selective 1,3-DC of azomethine ylides with fluorinated imines.
Copper(I)-Catalyzed Asymmetric 1,3-Dipolar Cycloaddition of Azomethine Ylides with Fluorinated Imines: The Expanded Scope and Mechanism Insights
作者:Liang Wei、Qing-Hua Li、Chun-Jiang Wang
DOI:10.1021/acs.joc.8b01743
日期:2018.10.5
The mechanism of the Cu(I)/(S,Rp)-PPFOMe-catalyzed 1,3-dipolar cycloaddition of azomethine ylides with fluorinated aldimines has been studied using labeling experiments, control experiments, and linear effect experiments, which clearly ruled out the 1,3-DC/epimerization pathways and explained the unusal exo′-selective stereochemistry. This protocol allows for the preparation of a series of highly functionalized
使用标记实验,对照实验和线性效应实验研究了Cu(I)/(S,R p)-PPFOMe催化的1,3-偶极环偶氮亚甲基与氟化亚胺的加成反应的机理,明确排除了1,3- DC /差向异构化途径和解释了此项特殊的外切' -选择性的立体化学。该方案允许以良好的产率和优异的立体选择性制备一系列高度官能化的氟化咪唑烷。而且,目前的方法已经成功地扩展到通过内含物合成具有挑战性的,带有CF 3的季立构中心的咪唑烷类化合物。在相同的反应条件下,用三氟化酮亚胺对甲亚胺烷基化物进行1,3-DC选择性合成。
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