55841-58-2Relevant academic research and scientific papers
Synthesis and photophysical insights of new fused N-heterocyclic derivatives with isoquinoline skeleton
Airinei, Anton,Craciun, Anda M.,Danac, Ramona,Gherasim, Carmen,Isac, Dragos Lucian,Mangalagiu, Ionel I.,Nicolescu, Alina,Tigoianu, Radu
, (2020/04/28)
Six new fused isoquinoline based compounds (compounds 5a–c with pyrrolo[2,1-a] isoquinoline structure and compounds 6a–c with imidazo[2,1-a]isoquinoline skeleton) have been synthesized using the [3 + 2] cycloaddition of the several in situ generated cycloimmonium ylides to ethyl propiolate or ethyl cyanoformate. All the synthesized compounds have been investigated in solution by UV–VIS absorption, steady and time-resolved fluorescence methods. The effect of the substituents on the spectral characteristics has been demonstrated. These derivatives displayed an intense emission between 360 and 420 nm. The emission quantum yields (Φ = 0.54–0.64) of pyrroloisoquinoline derivatives in dimethylsulfoxide (DMSO) were significantly higher than those of imidazoquinolines (0.03–0.16). The fluorescence decay of isoquinoline derivatives follows a biexponential law. A noticeable response of these isoquinoline derivatives to sodium hydroxide was observed.
External oxidant-free oxidation/[3+2] cycloaddition/aromatization cascade: Electrochemical synthesis of polycyclic N-heterocycles
Wang, Qiang,Yuan, Ting,Liu, Qiang,Xu, Yong,Xie, Guanqun,Lv, Xin,Ding, Shujiang,Wang, Xiaoxia,Li, Chen
supporting information, p. 8398 - 8401 (2019/07/22)
Here, we describe an efficient and environmentally friendly synthesis of polycyclic N-heterocycles under electrochemical external oxidant-free conditions. The extent of the sequential electrochemical oxidative aromatization can be regulated with the assistance of redox mediators.
Synthesis of 2-aminoindolizines by 1,3-dipolar cycloaddition of pyridinium ylides with electron-deficient ynamides
Brioche, Julien,Meyer, Christophe,Cossy, Janine
supporting information, p. 2800 - 2803 (2015/06/16)
Electron-deficient ynamides, possessing an ynoate or an ynone moiety, have been successfully involved for the first time in a 1,3-dipolar cycloaddition with stabilized pyridinium ylides. These reactions afford an efficient and general access toward a variety of substituted 2-aminoindolizines which can serve as useful precursors for the synthesis of other more complex nitrogen heterocycles.
1,2-Dihydroisoquinoline-N-Acetic Acid Derivatives as New Carriers for Specific Brain Delivery I: Synthesis and Estimation of Oxidation Kinetics Using Multivariate Calibration Method
Mahmoud, Sahar,Aboul-Fadl, Tarek,Sheha, Mahmoud,Farag, Hassan,Mouhamed, Abdel-Maaboud I.
, p. 573 - 584 (2007/10/03)
In order to overcome the slow oxidation of 1,2-dihydro-N-alkylisoquinoline, 1,2-dihydroisoquinoline-N-acetic acid derivatives (3 b-d) were designed and synthesized as new chemical delivery systems (CDS) for the brain. Molecular orbital calculations for th
Preparation of 1-trifluoroacetyl indolizines and their derivatives via the cycloaddition of pyridinium N-ylides with 4-4-ethoxy1-1,1,1-trifluorobut-3-en-one
Zhu, Shi-Zheng,Qin, Chao-Yue,Wang, Yan-Li,Chu, Qian-Li
, p. 183 - 187 (2007/10/03)
Under basic reaction conditions pyridinium or isoquinolinium N-ylides (C5H5N+ CH2YBr- or C9H7N+CH2YBr-, Y : CO2R, CN, PhCO) reacted readily with 4-ethoxyl-1,1,1-trifluorobut-3-en-2-one to give the corresponding 1-trifluoroacetyl substituted indolizines or pyrrolo-[1,2-a]isoquinolines. The molecular structure of 1-trifluoromethyl-3-methoxyl-pyrrolo-[1,2-a]isoquinoline is presented.
Stereoselective Cycloaddition of Pyridinium or Isoquinolinium Methylides with Olefinic Dipolarophiles and Subsequent Cycloadditions of the Cycloadducts with Nitrile Oxides
Tsuge, Otohiko,Kanemasa, Shuji,Takenaka, Shigeori
, p. 3631 - 3636 (2007/10/02)
Pyridinium or isoquinolinium methylides undergo highly stereo- and regioselective cycloadditions with olefinic dipolarophiles to form unstable tetrahydroindolizine derivatives.One of the two double bonds existing in the dihydro heteroaromatic ring of the cycloadducts reacts with nitrile oxides, in the same flask, in stereo-, regio-, and periselective fashions to lead to stable isoxazole-fused tetrahydroindolizines in good yields.
