ω-Quinazolinonylalkyl aryl ureas as reversible inhibitors of monoacylglycerol lipase
作者:Florian M. Dato、Jörg-Martin Neudörfl、Michael Gütschow、Bernd Goldfuss、Markus Pietsch
DOI:10.1016/j.bioorg.2019.103352
日期:2020.1
The serine hydrolase monoacylglycerollipase (MAGL) is involved in a plethora of pathological conditions, in particular pain and inflammation, various types of cancer, metabolic, neurological and cardiovascular disorders, and is therefore a promising target for drug development. Although a large number of irreversible-acting MAGL inhibitors have been discovered over the past years, there are only few
organocatalyst for the atom‐economic conversion of a plethora of alkyl‐ and aryl‐substituted epoxides and isocyanates into oxazolidinones is described. A mechanism was proposed wherein the nucleophilic ring‐opening operation, and oxo‐ and carbamate‐anions stabilization occur cooperatively towards isocyanate fixation.
Enantioselective conjugate addition of pyrazolones to nitroalkenes catalyzed by chiral squaramide organocatalyst
作者:Alime Ebru Aydin、Selda Culha
DOI:10.1002/chir.23295
日期:2021.3
squaramide catalysts (8–15) were synthesized, and their catalytic efficiency in the enantioselectiveconjugateaddition of pyrazolones to nitroalkenes was described. This protocol provides excellent chemical yields (up to 93%) of chiral 5‐methyl‐4‐(2‐nitro‐1‐arylethyl)pyrazol‐3‐ol derivatives with high enantioselectivities (up to 97% ee).
of dynamiccovalent chemistry, with applications such as preparation of functional systems, dynamic materials, molecular machines, and covalent organic frameworks. However, acid catalysis is commonly needed for efficient equilibration of imine mixtures. Herein, it is demonstrated that hydrogen bond donors such as thioureas and squaramides can catalyze the equilibration of dynamic imine systems under
Supramolecular Hydrogels Based on Minimalist Amphiphilic Squaramide-Squaramates for Controlled Release of Zwitterionic Biomolecules
作者:Carlos López、Marta Ximenis、Francisca Orvay、Carmen Rotger、Antonio Costa
DOI:10.1002/chem.201701029
日期:2017.6.1
prepared. The hydrogel (G′≈400 Pa, G′′≈57 Pa; at 1.0 % w/v; 1 Hz) obtained from 4‐nitrophenylsquaramide motif 1 is thermoreversible (T=57 °C at 0.2 % w/v), thixotropic, self‐healable, and undergoes irreversible shrinking in response to saline stress. Furthermore, the hydrogel is injectable and can be loaded with substantial amounts (5:1 excess molar ratio) of zwitterionicbiomolecules, such as l‐carnitine