Trimethoxybenzene- and trimethylbenzene-based compounds bearing imidazole, indole and pyrrole groups as recognition units: synthesis and evaluation of the binding properties towards carbohydrates
Trimethoxybenzene- and trimethylbenzene-based compounds bearing imidazole, indole and pyrrole groups as recognition units: synthesis and evaluation of the binding properties towards carbohydrates
[EN] MULTICYCLIC PEPTIDES AND METHODS FOR THEIR PREPARATION<br/>[FR] PEPTIDES MULTICYCLIQUES ET LEURS PROCÉDÉS DE PRÉPARATION
申请人:STICHTING TECHNISCHE WETENSCHAPPEN
公开号:WO2018106112A1
公开(公告)日:2018-06-14
The invention relates to methods for preparing a compound comprising a peptide attached to a molecular scaffold whereby multiple peptide loops are formed, to compounds that can be obtained with such methods and uses thereof.
is brought into play in the binding of salts by synthetic receptors. Following the heuristic concept that “bindingboth is bindingbetter”, it is widely believed that ditopic receptors capable of bindingboth ionic partners of a salt are more effective than monotopic receptors because of a cooperative effect. Using a newly designed ditopic receptor and a generalized binding descriptor, we show here that
We present a simple and versatile access to spheroidal molecular assemblies with pronounced stability in highly polar solvents. These complexes are composed of doubly and triply charged complementary building blocks based on ammonium or amidinium cations and phosphonate anions. Their high thermodynamic stability is best explained by the formation of a cyclic array of alternating positive and negative charges interconnected by a regular network of hydrogen bonds. Association constants reach 10(6) M-1 in methanol and often surpass 10(3) M-1 in water. The broad range of binding energies correlates well with the varying degree of preorganization of both complex partners. As a byproduct of these investigations, new recognition motifs for histidine and arginine esters and the unsubstituted guanidinium ion are proposed. The additional introduction of methyl groups in the 2-, 4-, and 6-positions of the central benzene ring in either cations or anions causes a marked drop in the corresponding K-a values of 1 order of magnitude; the related rotational barriers were estimated at 0.3-2.1 kcal/mol. Spontaneous formation of defined 2:1 complexes from three components has also been observed.
Self-Organization of Spheroidal Molecular Assemblies in Polar Solvents
[GRAPHICS]We report a number of 1:1 noncovalent complexes composed of a symmetrical trisphosphonate and various symmetrical trisammonium or trisamidinium compounds. The spheroidal complexes show high thermodynamic stability, with association constants K-a reaching 10(6) M-1 in methanol and in some cases even exceeding 10(3) M-1 in water. The observed K-a values correlate well with the different degree of preorganization of the complexation partners.