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Dr. Agustí Lledó
Tel. (+34) 610 865 823
Diego Vidal, Miquel Costas, and Agustí Lledó
A Deep Cavitand Receptor Functionalized with Fe(II) and Mn(II) Aminopyridine Complexes for Bioinspired Oxidation Catalysis
ACS Catal., 2018, 8, 3667–3672
Complementary Binding in Urea-Based Self-Folding Cavitands
Org. Lett. 2015, 17, 15, 3770-3773
Albert Artigas, Jordi Vila, Agustí Lledó, Miquel Solà, Anna Pla-Quintana, Anna Roglans
A Rh-Catalyzed Cycloisomerization/Diels–Alder Cascade Reaction of 1,5-Bisallenes for the Synthesis of Polycyclic Heterocycles
Org. Lett., 2019, 21, 6608-6613
Albert Artigas, Anna Pla-Quintana, Agustí Lledó, Anna Roglans, Miquel Solà
Expeditious Preparation of Open-Cage Fullerenes by Rhodium(I)-Catalyzed [2+2+2] Cycloaddition of Diynes and C60: an Experimental and Theoretical Study
Chem. Eur. J., 2018, 24, 10653-10661
Cavitands are synthetic molecules with a permanent concave shape that can accommodate smaller molecules or ions inside. The encapsulation of a molecule in the confined space of cavitands has dramatic consequences for the reactivity of the bound species, and these effects can be harnessed to develop enzyme-like reactivity and catalysis. A prerequisite for this is the functionalization of the inner space with reactive groups that are in close contact with the bound substrate, very much like catalytic residues in the active site of an enzyme.
Our lab has developed a variety of functional receptors based on the amide-stabilized cavitand scaffold. We have developed urea and thiourea functionalized receptors towards the development of bioinspired carbocationic cylization reactions. Additionally, we have proven the versatility of this system by attaching it to highly reactive iron and manganese complexes used in C–H oxidation reactions. This system provides a robust and promising platform for bioinspired site-selective oxidation reactions.
A limitation of conventional cavitands is their narrow binding space. In addition, these receptors have a strong preference for rigid pseudo-cylindrical conformation, which poses a limitation to accessing adaptable confined spaces. A distinct feature of proteinogenic receptors is their conformational flexibility, which allows them to adapt to guests of different sizes and shapes through induced fit or conformational selection phenomena. This is an essential trait for some biological functions (e.g. enzymatic catalysis) that is very difficult to introduce by design in artificial systems.
Within this conceptual framework, a second research direction in our lab aims at developing new synthetic platforms that would be more amenable to generalizing enzyme-like catalysis. Our efforts focus on hydrogen bond stabilized calixarene derived cavitands. We have developed a receptor that is structured, yet flexible enough to adapt to an incoming guest of complementary size, such as coronene, a large polycyclic aromatic hydrocarbon. Current efforts are directed towards using these expanded and flexible confined spaces to promote new bioinspired reactivity.
The Institute of Computational Chemistry and Catalysis (IQCC) of the University of Girona
Last 20th April took place the 30 years IQC(C) celebration. This wonderful moment
The Organic Letters Journal features on its front cover the recently published research
Since 2015 the IQCC is organizing a Science Slam. On Tuesday April 25th