已经研究了N-基化物[H x C y N–CHC(O)Ar]的原palpalladation (H x C y N =吡啶,苄胺,咪唑,苯胺和苯基吡啶; Ar =芳基)。Pd原子结合到这些底物上是区域选择性的,因为在大多数情况下,仅在苯甲酰基的芳环上产生原钯,并伴随着N-内酯的C键。报告了一个代表性实例的X射线结构。讨论了控制观察到的取向的因素,因为考虑到羰基的失活性质,这种区域选择性是值得注意的。已观察到总体趋势的两个例外。第一个是叶立德[PhMe 2NCHC(O)Ph],在每个Ph处都掺入一个Pd。第二个是在吡啶2-苯环上发生的苯基吡啶衍生物的palpalation,并生成六元的palladacycle。
Ruthenium-NHC-Catalyzed Asymmetric Hydrogenation of Indolizines: Access to Indolizidine Alkaloids
作者:Nuria Ortega、Dan-Tam D. Tang、Slawomir Urban、Dongbing Zhao、Frank Glorius
DOI:10.1002/anie.201302218
日期:2013.9.2
complex serves as the catalyst for the high‐yielding and completely regioselective and asymmetrichydrogenation of substituted indolizines and 1,2,3‐triazolo‐[1,5‐a]pyridines. This method should provide ready access to bicyclic products bearing an N‐bridgehead, a motif appearing in 25–30 % of all naturally occurring alkaloids.
越过N桥!钌/ N-杂环卡宾(NHC)络合物可作为取代吲哚嗪和1,2,3-三唑并[1,5- a ]吡啶的高产率,完全区域选择性和不对称氢化的催化剂。该方法应使带有N桥头的双环产物易于获得,该花环出现在所有天然生物碱的25%至30%中。
Regioselective C–H dithiocarbamation of indolizines with tetraalkylthiuram disulfide under metal-free conditions
作者:Xiang Liu、Dan Song、Zemin Zhang、Jiatong Lin、Canzhan Zhuang、Haiying Zhan、Hua Cao
DOI:10.1039/d1ob00701g
日期:——
disulfide has been described. A series of indolizine-dithiocarbamate derivatives were easily accessed in moderate to good yields with a broad scope. In addition, imidazo[1,2-a]pyridines were also well tolerated to afford diverse imidazoheterocycle-dithiocarbamate products, which are expected to be utilized for drug discovery. Of note, the reaction could be readily scaled up, and shows its practical value in
已经描述了用四烷基秋兰姆二硫化物对中氮茚进行有效且直接的无金属区域选择性 C-H 二硫代氨基甲酸化。一系列中氮茚-二硫代氨基甲酸酯衍生物很容易以中等至良好的收率获得,范围广泛。此外,咪唑并[1,2 - a ]吡啶也具有良好的耐受性,可提供多种咪唑杂环-二硫代氨基甲酸酯产品,有望用于药物发现。值得注意的是,该反应可以很容易地放大,并显示出其在有机合成中的实用价值。
Mechanochemical Synthesis of 1,2-Diketoindolizine Derivatives from Indolizines and Epoxides Using Piezoelectric Materials
作者:Yumei Wang、Ziwu Zhang、Lichan Deng、Tianfeng Lao、Zhengquan Su、Yue Yu、Hua Cao
DOI:10.1021/acs.orglett.1c02575
日期:2021.9.17
A simple and efficient mechanochemical-induced approach for the synthesis of 1,2-diketoindolizine derivatives has been developed. BaTiO3 was used as the piezoelectric material in this transformation. This method features no usage of solvent, simple experimental operation, scalable potential, and high conversion efficiency, which make it attractive and practical.
Heck-Type Cross-Dehydrogenative Coupling Reactions of Indolizines at the 3-Position with Electron-Deficient Alkenes through Palladium-Catalyzed CH Activation
作者:Huayou Hu、Yun Liu、Hao Zhong、Yulan Zhu、Chao Wang、Min Ji
DOI:10.1002/asia.201101050
日期:2012.5
A cross‐dehydrogenative coupling reaction of indolizines with electron‐deficient alkenes for the synthesis of 3‐alkenyl‐substituted indolizines has been reported. The reaction takes place at the 3‐position selectively through palladium‐catalyzed CH activation, following a Heck‐type cross‐coupling reaction under mild and ligand‐free conditions. Furthermore, the reaction mechanism of the PdII/Pd0 catalytic
据报道,吲哚嗪与缺乏电子的烯烃发生交叉脱氢偶联反应,可合成3-烯基取代的吲哚嗪。在温和且无配体的条件下发生Heck型交叉偶联反应后,该反应通过钯催化的CH活化选择性地在3位发生。此外,还通过1 H NMR光谱证实了Pd II / Pd 0催化途径的反应机理。
Synthesis of Pyrrolo[2,1,5-<i>cd</i>]indolizine Rings via Visible-Light-Induced Intermolecular [3+2] Cycloaddition of Indolizines and Alkynes
作者:Yu Zhang、Yue Yu、Bing-bing Liang、Yong-yan Pei、Xiang Liu、Hua-gang Yao、Hua Cao
DOI:10.1021/acs.joc.0c01253
日期:2020.8.21
smoothly underwent visible-light-induced intermolecular [3+2] annulations with internal alkynes to afford pyrrolo[2,1,5-cd]indolizine in good to excellent yields with high regioselectivity. Through this cascade reaction, a series of fluoroactive fused indolizines with a large π-system were conveniently synthesized. The usage of visiblelight as energy source with air as a stoichiometric oxidant under
一系列吲哚并嗪通过内部炔烃顺利地进行了可见光诱导的分子间[3 + 2]环空拆分,从而以良好的产率和良好的区域选择性提供了吡咯并[2,1,5- cd ]吲哚并嗪。通过该级联反应,方便地合成了具有大π系统的一系列含氟稠合吲哚嗪。在简单条件下使用可见光作为能源,以空气作为化学计量的氧化剂,使该过程具有吸引力和实用性。