Highly Active Oxime-Derived Palladacycle Complexes for Suzuki−Miyaura and Ullmann-Type Coupling Reactions
作者:Diego A. Alonso、Carmen Nájera、M Carmen Pacheco
DOI:10.1021/jo025619t
日期:2002.8.1
palladacycles 12 and 13 are efficient complexes for the Suzuki-Miyaura reactions of aryl-, allyl-, and benzyl halides with arylboronic acids. The isolated catalysts are thermally stable, not sensitive to air or moisture, and easily accessible from inexpensive starting materials. The reaction can be performed under aerobic conditions with aryl bromides and chlorides, displaying turnover numbers (TON) of up to 5
肟衍生的氯桥键式四环十二环是芳基,烯丙基和苄基卤化物与芳基硼酸的Suzuki-Miyaura反应的有效配合物。分离出的催化剂是热稳定的,对空气或湿气不敏感,并且容易从廉价的起始原料获得。该反应可以在有氧条件下用芳基溴化物和氯化物进行,显示出最高5 x 10(5)的周转率(TON)和最高198 000 h(-1)的周转频率(TOF)。芳基氯化物与芳基硼酸进行Suzuki反应,TON可达4700,TOF可达4700 h(-1)。甚至廉价且易于获得的苄基氯和烯丙基氯也以良好的周转数进行偶联反应。
Interrupted Imino-Nazarov Cyclization of 1-Aminopentadienyl Cation and Related Cascade Process
作者:Ronny William、Siming Wang、Feiqing Ding、Elise Nerissa Arviana、Xue-Wei Liu
DOI:10.1002/anie.201405251
日期:2014.9.26
Facile 4π conrotatory imino‐Nazarov cyclization of a 1‐aminopentadienyl cation generated from condensation an aldehyde and secondary aniline in the presence of a catalytic amount of a Lewis acid has been developed. Silver(I)‐catalyzed intramolecular arene trapping of the resulting cyclic oxyallyl cation leads to formation of tricyclic indoline‐fused cyclopentanone. The use of lanthanide salts allows
Enantioselective radical addition reactions to imines using binaphthol-derived chiral N-triflyl phosphoramides
作者:Sunggi Lee、Sunggak Kim
DOI:10.1016/j.tetlet.2009.02.136
日期:2009.7
Binaphthol-derived chiral phosphoric acid catalysts were applied to enantioselective radical addition reactions of imines and provided chiral amines with good enantioselectivities (73–84% ee). Furthermore, the enantioselectivities were not affected by either electronic properties of phenyl imines or radical precursors.
A strategy for one-pot synthesis of isoindoles is described via a catalytic multicomponent dehydrogenative annulation of diarylimines, vinyl ketones and simple amines. In the presence of a rhodium catalyst and Cu oxidant, four C–H and two N–H bonds are activated along with the formation of one new C–C and two new C–N bonds, leading to a series of isoindole derivatives in good to very high isolated
New Synthesis, Electroluminescence, and Photophysical Properties of Poly[(formylphenyl)methylsilanediyl] and Its Derivatives
作者:Drahomír Výprachtický、Věra Cimrová
DOI:10.1021/ma010736w
日期:2002.4.1
formylated poly[methyl(phenyl)silanediyl] (PMPSi) is reported. The aldehyde groups were incorporated into the parent polymer by the reaction with dichloromethyl methyl ether in the presence of Lewis acid (SnCl4). The reaction takes place via an unstable aryl(methoxy)methyl chloride intermediate. The new procedure is an important simplification of the known four-step synthesis of the poly[(formylphe
报道了甲酰化聚[甲基(苯基)硅烷二基](PMPSi)的新的一步合成。通过在路易斯酸(SnCl 4)存在下与二氯甲基甲基醚反应,将醛基结合到母体聚合物中。该反应通过不稳定的芳基(甲氧基)甲基氯中间体进行。该新方法是第一步中通过氯甲基化的聚[(甲酰基苯基)甲基硅烷二基]的四步合成的重要简化。聚合物中醛基的存在和反应性通过1 H NMR,UV-vis和FT IR光谱进行了验证。反应后母体聚硅烷的相对分子量的降低没有多步合成中那么明显。模型化合物N-亚苄基-1-氨基py,N-亚苄基-4-苯基苯胺和N合成了-亚苄基-4-苯基偶氮苯胺,用于光谱表征取代的聚硅烷。π共轭体系(py,联苯,偶氮苯)连接到σ共轭聚硅烷骨架上。研究了这些材料的光物理性质,光稳定性,电荷光生和光致发光。制作了在可见光谱区域内发射光的单层和双层发光器件(LED)。研究了它们的光谱和电学特性。双层LED的电致发光效率达到0.03-0