Mirza Arfan Yawer
Masaryk University
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Publication
Featured researches published by Mirza Arfan Yawer.
Angewandte Chemie | 2015
Mirza Arfan Yawer; Václav Havel; Vladimir Sindelar
Synthetic receptors that function in water are important for the qualitative and quantitative detection of anions, which may act as pollutants in the environment or play important roles in biological processes. Neutral receptors are particularly appealing because they are often more selective than positively charged receptors; however, their affinity towards anions in pure water is only in range of 1-10(3) L mol(-1) . The anion-templated synthesis of a water-soluble bambusuril derivative is shown to be an outstanding receptor for various inorganic anions in pure water, with association constants of up to 10(7) L mol(-1) . Furthermore, the macrocycle discriminates between anions with unprecedented selectivity (up to 500 000-fold). We anticipate that the combination of remarkable affinity and selectivity of this macrocycle will enable the efficient detection and isolation of diverse anions in aqueous solutions, which is not possible with current supramolecular systems.
Bioorganic & Medicinal Chemistry | 2008
Ibrar Hussain; Mirza Arfan Yawer; Michael Lalk; Ulrike Lindequist; Alexander Villinger; Christine Fischer; Peter Langer
Abstract Hetero-Diels–Alder reactions of 1,3-bis(silyloxy)-1,3-butadienes with arylsulfonylcyanides afforded a variety of 4-hydroxy-2-(arylsulfonyl)pyridines. Several derivatives show antimicrobial activity against Gram-positive bacteria.
Chemistry: A European Journal | 2017
Lukas Mikulu; Romana Michalicová; Vivian Iglesias; Mirza Arfan Yawer; Angel E. Kaifer; Premysl Lubal; Vladimir Sindelar
Cucurbit[7]uril (CB7) is a macrocycle with the ability to form the most stable supramolecular complexes in water ever reported for an artificial receptor. Its use for the design of advanced functional materials is, however, very limited because there is no example of a fully reversible CB7 based supramolecular complex enabling repetitious dissociation/association controlled by external stimuli. We report the synthesis of a new ferrocene amino acid that forms with CB7 a 1:1 inclusion complex that is stable in submicromolar concentration at low pH but dissociates at high pH. This reversible process was used for the sequential uptake and release of bispyridinium and antraquinone guests by CB7, which is controlled by adjusting the pH of the solution.
Zeitschrift für Naturforschung B | 2013
Rüdiger Dede; Abdolmajid Riahi; Mohanad Shkoor; Mirza Arfan Yawer; Ibrar Hussain; Nazken Kelzhanova; Zharylkasyn A. Abilov; Abiodun Falodun; Helmar Görls; Peter Langer
The TiCl4-mediated cyclization of 1,3-bis(silyloxy)-1,3-butadienes with 2-acetyl-1-silyloxybut-1- en-3-one and 3-acetyl-4-silyloxypent-3-en-2-one, readily available from 3-(formyl)acetylacetone and 3-(acetyl)acetylacetone (triacetylmethane), afforded a variety of functionalized acetophenones Graphical Abstract Synthesis of Functionalized Acetophenones by Formal [3+3] Cyclocondensations of 1,3-Bis(silyloxy)-1,3-butadienes with 3-Alkoxyand 3-Silyloxy-2-acetyl-2-en-1-ones
Chemistry: A European Journal | 2017
Edoardo Torti; Václav Havel; Mirza Arfan Yawer; Lucie Ludvíková; Michal Babiak; Petr Klán; Vladimir Sindelar
The oxidizing ability of peroxodisulfate upon complexation inside the Bambusuril macrocycle cavity is inhibited. This dianionic agent can be released on demand from its stable 1:1 complex in water (log Ka =6.9 m-1 ) by addition of a more strongly bound anion, such as iodide (log Ka =7.1 m-1 ), which can also be delivered in situ upon irradiation from a 4-hydroxyphenacyl iodide derivative with spatial and temporal precision. The oxidizing properties of peroxodisulfate ions liberated from the complex recover and can take part in subsequent chemical transformations.
Journal of Organic Chemistry | 2007
Ibrar Hussain; Van Thi Hong Nguyen; Mirza Arfan Yawer; Tuan Thanh Dang; Christine Fischer; Helmut Reinke; Peter Langer
Advanced Synthesis & Catalysis | 2016
Ibrar Hussain; Jaworski Capricho; Mirza Arfan Yawer
Chemical Communications | 2015
Václav Havel; Mirza Arfan Yawer; Vladimir Sindelar
European Journal of Organic Chemistry | 2008
Ibrar Hussain; Mirza Arfan Yawer; Matthias Lau; Thomas Pundt; Christine Fischer; Helmar Görls; Peter Langer
Tetrahedron | 2009
Stefan Büttner; Abdolmajid Riahi; Ibrar Hussain; Mirza Arfan Yawer; Mathias Lubbe; Alexander Villinger; Helmut Reinke; Christine Fischer; Peter Langer