咪唑并[1,5- a ]吡啶碳酸酯与醛和乙炔二甲酸二甲酯或脲基甲酸酯的多组分反应:直接取代完全呋喃的简便方法
摘要:
公开了N,N-取代的咪唑并[1,5- a ]吡啶碳烯的简单的三组分反应,即咪唑并[1,5 - a ]吡啶-3-亚胺与醛和DMAD或脲基甲酸酯的反应。这两个反应都是通过串联亲核加成,[3 + 2]-环加成和环转化进行的,通常以中等收率产生不同的4-[((2-吡啶基)甲基]氨基呋喃衍生物。这项工作不仅提供了咪唑并[1,5 - a ]吡啶-3-吡咯烷在有机合成中的应用的第一个例子,而且还开发了一种直接取代完全呋喃的简单方法,而其他方法不易获得。
NHC stabilized Pd nanoclusters in the Mizoroki–Heck reaction within microemulsion: exploring the role of imidazolium salt in rate enhancement
作者:Koena Ghosh、Shubhajit Dhara、Sourav Jana、Subhomoy Das、Sudeshna Roy
DOI:10.1039/c8nj05118f
日期:——
significant rate enhancement of the Mizoroki–Heckreaction by in situ generated palladium nanoclusters within the confined space of water-in-oil (w/o) mixed microemulsion (μE) formulated by sodium dodecylsulfate (SDS), polyoxyethylene (23) lauryl ether (Brij-35) and isopropyl myristate (IPM), in the presence of novel imidazo[1,5-α]pyridinium chlorides as N-heterocycliccarbene (NHC) precursors. This is the
Imidazo[1,5-a]pyridines have been used as monodentate ligands in late transition-metal N-heterocyclic carbene (NHC) complexes, but the N-aryl substituted heterocyclic ligands also allow for the formation of C∧C* cyclometalated complexes, which has previously only been shown for iridium(III) complexes. Here we present the first C∧C* platinum(II) NHC complexes of this class. A monoanionic bidentate ligand L
Fluorescence Switching of Imidazo[1,5-<i>a</i>]pyridinium Ions: pH-Sensors with Dual Emission Pathways
作者:Johnathon T. Hutt、Junyong Jo、András Olasz、Chun-Hsing Chen、Dongwhan Lee、Zachary D. Aron
DOI:10.1021/ol3012524
日期:2012.6.15
Imidazo[1,5-a]pyridinium ions are identified as highly emissive and water-soluble fluorophores accessed by an efficient three-component coupling reaction. Synthetic modifications of groups conjugated to the polyheterocyclic core are shown to profoundly impact the emission properties of these molecules. Notably, two structural isomers of functionalized imidazo[1,5-a]pyridinium ions were found to exhibit
咪唑并[1,5- a ]吡啶离子被鉴定为通过有效的三组分偶联反应获得的高发射性和水溶性荧光团。已显示出与多杂环核心共轭的基团的合成修饰深刻地影响了这些分子的发射特性。值得注意的是,发现官能化的咪唑并[1,5- a ]吡啶鎓离子的两个结构异构体表现出不同的去激发途径,这引起荧光开启或对pH值变化的比例响应。
Stepwise and one-pot syntheses of Ir(<scp>iii</scp>) complexes with imidazolium-based carbene ligands
treatment of [Ir(mu-Cl)(COD)]2, where COD is 1,5-cyclooctadiene, with 4 equiv. of the corresponding carbene (Cinsertion markC:) ligands in the presence of an excess amount of sodium methoxide affords Ir(III) dimers [Ir(mu-Cl)(Cinsertion markC:)2]2 (2a, Cinsertion markC: = pypi(-); 2b, Cinsertion markC: = pympi(-)). These chloro-bridged dimers 2a and 2b react with the corresponding carbene (Cinsertion
The multicomponent reaction of imidazo[1,5-a]pyridine carbenes with phthalaldehydes and dimethyl acetylenedicarboxylate: a facile construction of benzo[d]furo[3,2-b]azepines
phthalaldehydes is reported. The imidazo[1,5-a]pyridine carbenes, namely imidazo[1,5-a]pyridine-3-ylidenes, reacted with phthalaldehydes and DMAD under very mild conditions to producenovel fused tricyclic benzo[d]furo[3,2-b]azepine derivatives. The resulting fused heterocyclic compounds are fluorescent and they give an emission around 500 nm with quantum yields (ΦF) being up to 0.81. This study provides
报道了同时包含N-杂环卡宾和取代的苯二醛的多组分反应的研究。这咪唑并[1,5- a ]吡啶卡宾苯,即咪唑并[1,5 - a ]吡啶-3-吡喃酮,在非常温和的条件下与邻苯二甲醛和DMAD反应生成新的稠合三环苯并[ d ]呋喃[3,2- b ] a庚因衍生物。将所得的稠合杂环化合物是荧光,它们给周围的量子产率(500nm的发射Φ ˚F)至多为0.81。这项研究不仅提供了一种独特的方法来处理稠合的ze庚因衍生物,而这种方法是其他方法不易获得的,而且为复杂的分子骨架开辟了一条新途径。一些产品的长发射波长的荧光特性和高荧光量子产率预示了它们作为光学传感器的潜在应用。