generate indolyl nitroalkane 5 and pyrrolyl nitroalkane 7 in high yields using β-nitrostyrene and indole/pyrrole at room temperature in the presence of catalytic amount of iodine is reported. The short reaction times and high yields of product are noteworthy. Molecular iodine promoted Michaeladdition is operationally simple and efficient method compared to the known Lewis acids or rare earth metal
Friedel–Crafts alkylation reaction with fluorinated alcohols as hydrogen-bond donors and solvents
作者:Ren-Jin Tang、Thierry Milcent、Benoit Crousse
DOI:10.1039/c8ra01397g
日期:——
and electron-rich arenes with β-nitroalkenes in HFIP was reported. The desired products are formed rapidly in excellent yields under mild conditions without the need for any additional catalysts or reagents. Further, this methodology can be applied to one-pot synthesis of biologically active tryptamine derivatives.
据报道,在 HFIP 中吲哚和富电子芳烃与 β-硝基烯烃发生有效且清洁的 FC 烷基化。在温和条件下以优异的产率快速形成所需产物,无需任何额外的催化剂或试剂。此外,该方法可应用于生物活性色胺衍生物的一锅合成。
Lewis Acid Activation of a Hydrogen Bond Donor Metal–Organic Framework for Catalysis
作者:Edward A. Hall、Louis R. Redfern、Michael H. Wang、Karl A. Scheidt
DOI:10.1021/acscatal.6b00424
日期:2016.5.6
A newmetal–organicframework (MOF) composed of urea-containing tetracarboxylate struts was synthesized, and its hydrogen bonding capabilities were evaluated. The catalytic performance of this heterogeneousframework is enhanced through preactivation with silyl Lewis acids, leading to Friedel–Crafts reaction rates greater than those of common homogeneous hydrogen bonddonors.
An Efficient Method for the N-Bromosuccinimide Catalyzed Synthesis of Indolyl-Nitroalkanes
作者:Chun-Wei Kuo、Chun-Chao Wang、Hu-Lin Fang、B. Raju、Veerababurao Kavala、Pateliya Habib、Ching-Fa Yao
DOI:10.3390/molecules14103952
日期:——
An efficient and practical method for the synthesis of indolyl-nitroalkane derivatives catalyzed by N-bromosuccinimide is described. The generality of this method was demonstrated by synthesizing an array of diverse 3-substituted indole derivatives by the reaction of different β-nitrostyrenes with various substituted indoles. Simple reaction conditions accompanied by good yields of indolyl-nitroalkanes are the merits of this methodology.
Montmorillonite K10 was found to catalyze the Michaeladdition of indoles or pyrrole with nitroalkenes efficientlyunder solventless condition. The short reaction time, simple workup, and excellent yields were noteworthy. The green catalyst could be reused for three runs without considerable variation in yield.