Synthesis, photophysical and solvatochromic properties of diacetoxyboron complexes with curcumin derivatives
作者:Heng Lyu、Dan Wang、Lian Cai、Dun-Jia Wang、Xiao-Ming Li
DOI:10.1016/j.saa.2019.05.031
日期:2019.9
spectroscopy in different solvents and solidstate. It was observed that their fluorescence spectra yielded a blue to yellow-green emission in solution and emitted a yellow to red emission in solidstate. Especially, the complex 3b displayed the strongest emission and the highest quantum efficiency (Φu = 0.98) in toluene among these complexes. The CIE coordinate of the complex 3b in solidstate was positioned
设计并合成了五个新的β-二酮结合姜黄素部分的二乙酰氧基硼配合物。通过紫外可见吸收和荧光光谱研究了它们在不同溶剂和固态下的光物理行为。观察到它们的荧光光谱在溶液中产生蓝至黄绿色发射,而在固态下发射黄至红色发射。尤其是,该复合物3b中显示的最强发射和最高量子效率(Φ û = 0.98)在这些配合物中的甲苯。复杂3b的CIE坐标处于固态时,其处于色度图的理想红色区域。这些配合物的最大发射显示出大的波长偏移,并且斯托克斯偏移随着溶剂极性的增加而增加。利用Lippert-Mataga方程也可以估算出基态和激发态之间的偶极矩差。同时,通过循环伏安法计算了它们的HOMO,LUMO能级和能带隙。
Regio- and stereoselective synthesis of functionalized tetrahydro-benzochromenes and hexahydrochromenochromenones <i>via</i> [4 + 2] annulation of curcumins with nitrochromenes
作者:Banamali Laha、Alati Suresh、Irishi N. N. Namboothiri
DOI:10.1039/d2ob02211g
日期:——
A base-mediated regio- and stereoselective synthesis of functionalized tetrahydro-6H-benzo[c]chromenes and hexahydro-1H,6H-chromeno[6,5-c]chromenone is disclosed here. It involves a [4 + 2] annulation via cascade double and triple Michael reactions between curcumins and nitrochromenes in the presence of Cs2CO3 and DBU, respectively, at room temperature, and it offers a diverse array of products as
本文公开了功能化四氢-6 H-苯并[ c ]色烯和六氢-1H , 6H-色烯[6,5- c ]色烯酮的碱介导区域选择性和立体选择性合成。它涉及在存在 Cs 2 CO 3的情况下,通过姜黄素和硝基色烯之间的级联双重和三重迈克尔反应的[4 + 2] 环化和 DBU,分别在室温下,它提供了多种产品作为单一区域和非对映异构体,在温和条件下产量高。在有机催化条件下开发对映选择性版本的初步研究只取得了有限的成功,但揭示了一个潜在有趣的动力学拆分途径。
Enantioselective Desymmetrization of Curcumins with 3‐Olefinic Oxindoles for the Synthesis of Spirocyclohexanoneoxindoles
作者:Chenikkayala Siva Sankara、Shweta Bhagat、Ajeet Chandra、Irishi N. N. Namboothiri
DOI:10.1002/ejoc.202300069
日期:——
Spiro-oxindoles containing three contiguous chiral centers were synthesized with excellent diastereo- and enantioselectivities via cascade double Michael reactions of curcumins with 3-alkylideneoxindole carboxylates. The selectivities are supported by transitions state energy calculations at B3LYP//6-31g(d) level of DFT.
Reactions of .beta.-diketones with aromatic aldehydes and ketones in the presence of potassium hydride
作者:Terry L. Rathman、Thomas D. Greenwood、James F. Wolfe、Gene F. Morris
DOI:10.1021/jo01294a032
日期:1980.3
Synthesis and photophysical properties of ditrifluoroacetoxyboron complexes with curcumin analogues
作者:Lian Cai、Hengyi Du、Dan Wang、Heng Lyu、Dunjia Wang
DOI:10.1016/j.saa.2020.119297
日期:2021.3
Especially, complex 2c displayed the strongest emission intensity, the highest quantum yield in solution and the longest fluorescence lifetime in powder state in these complexes. In addtion, the emission bathochromic shifts of these complexes as a function of the solvent polarity parameter ET(30) were investigated by Lippert–Mataga approximation. It was observed that these complexes exhibited the