A convenient regioselective synthesis of spirooxindolinopyrrolizidines incorporating the pyrene moiety through a [3 + 2]-cycloaddition reaction
作者:Essam M. Hussein、Saleh A. Ahmed、Ismail I. Althagafi
DOI:10.1515/hc-2017-0036
日期:2017.10.26
Abstract A facile one-potsynthesis of spirooxindolinopyrrolizidines incorporating the pyrene moiety was accomplished in good yields through a 1,3-dipolarcycloadditionreaction of 3-aryl-1-(pyren-1-yl)prop-2-en-1-one derivatives with in situ-generated azomethine ylides.
MCM-SO3H catalyzed synthesis of environment-sensitive fluorophores incorporating pyrene moiety: Optimization, fluorescence emission and theoretical studies
作者:Nizar El Guesmi、Essam M. Hussein、Saleh A. Ahmed
DOI:10.1016/j.jphotochem.2018.11.036
日期:2019.2
shift was observed in the emission spectrum of 5-(aryl)-1-phenyl-3-(pyren-1yl)-2-pyrazolines Δλ ∼ 50 nm compared to the absorptionspectrum Δλ ∼ 10 nm upon increasing the solventpolarity. This indicated the presence of higher dipole moment in the excited state than in the ground state and the transition involved are π-π* transition through the charge transfer phenomena. The fundamental understanding
通过各种(E)-3-芳基-1-(吡喃-1-基)丙酸酯的反应合成了六种新的高荧光5-(芳基)-1-苯基-3-(吡喃基-1)-2-吡唑啉。在磺化中孔二氧化硅(MCM-SO 3 H)的存在下,2-苯-1-酮与苯肼一起作为高效且环保的酸性催化剂。根据光谱数据(IR,1 H NMR和131 H NMR)。随后进行基于光物理性质的目标化合物在不同溶剂极性溶液中的吸收和发射研究。用pyr标记的对微环境敏感的荧光吡唑啉显示出有价值的荧光性质,其发射范围为600-700 nm,对环境极性的变化有明显的响应。当5-(芳基)-1-苯基-3-(pyren-1yl)-2-吡唑啉的发射光谱Δλ〜50 nm相比于吸收光谱Δλ〜10 nm的发射光谱中观察到明显且明显的红移。溶剂极性。这表明在激发态中比在基态中存在更高的偶极矩,并且所涉及的跃迁是通过电荷转移现象的π-π*跃迁。
Facile access to regio- and stereoselective synthesis of highly functionalized spiro[indoline-3,2′-pyrrolidines] incorporating a pyrene moiety: experimental, photophysical and theoretical approach
作者:Essam M. Hussein、Ziad Moussa、Nizar El Guesmi、Saleh A. Ahmed
DOI:10.1039/c8ra04312d
日期:——
investigated using global and local reactivity indices and frontier molecular orbital (FMO) analysis at the B3LYP/6-31G level of theory. The relationship between the electrophilicity index ω of the dipolarophiles and the Hammett constant σp has been studied. The theoretical scale of reactivity correctly explains the electrophilic activation/deactivation effects promoted by electron-withdrawing and
偶氮甲碱叶立德的区域和立体化学极性[3 + 2]环加成,通过靛红和肌氨酸或苄胺与( E )-3-芳基-1-(芘-1-基)丙反应原位生成使用实验和理论方法对-2-en-1-ones作为亲偶极试剂进行了研究。所有产品的化学结构和相关构型均已通过一维和二维同核和异核相关核磁共振谱完全确定。讨论了反应的电子和空间因素的影响。研究了合成的螺[二氢吲哚-3,2'-吡咯烷]-2-酮和5'-苯基-螺[二氢吲哚-3,2'-吡咯烷]-2-酮的光物理性质。使用全局和局部反应性指数以及 B3LYP/6-31G 理论水平的前沿分子轨道 (FMO) 分析研究了反应机理。研究了亲偶极试剂的亲电指数ω与哈米特常数σ p之间的关系。反应性的理论尺度正确地解释了亲偶极体对位的吸电子和释放电子取代基促进的亲电子活化/失活效应。
Merging Photocatalytic Doubly‐Decarboxylative C<sub>sp</sub><sup>2</sup>−C<sub>sp</sub><sup>2</sup> Cross‐Coupling for Stereo‐Selective (<i>E</i>)‐<i>α</i>,<i>β</i>‐Unsaturated Ketones Synthesis
作者:Subal Mondal、Siba P. Midya、Soumya Mondal、Suman Das、Pradyut Ghosh
DOI:10.1002/chem.202303337
日期:2024.1.26
cross-coupling reaction. Present catalytic system efficiently cross-coupled α, β-unsaturatedacids and α-keto acids to a variety of α, β-unsaturated ketones with excellent E-selectivity and functional group tolerance. In this merging catalysis, photocatalyst implicated through reductive quenching cycle whereas cross coupling proceeded over one electron oxidative pallado-cycle in a tandem pathway.