Synthesis of multimeric pyrrolidine iminosugar inhibitors of human β-glucocerebrosidase and α-galactosidase A: First example of a multivalent enzyme activity enhancer for Fabry disease

The synthesis of a chemical library of multimeric pyrrolidine-based iminosugars by incorporation of three pairs of epimeric pyrrolidine-azides into different alkyne scaffolds via CuAAC is presented. The new multimers were evaluated as inhibitors of two important therapeutic enzymes, human α-galactosidase A (α-Gal A) and lysosomal β-glucocerebrosidase (GCase). Structure-activity relationships were established focusing on the iminosugar inhitope, the valency of the dendron and the linker between the inhitope and the central scaffold. Remarkable is the result obtained in the inhibition of α-Gal A, where one of the nonavalent compounds showed potent inhibition (0.20 μM, competitive inhibition), being a 375-fold more potent inhibitor than the monovalent reference. The potential of the best α-Gal A inhibitors to act as pharmacological chaperones was analyzed by evaluating their ability to increase the activity of this enzyme in R301G fibroblasts from patients with Fabry disease, a genetic disorder related with a reduced activity of α-Gal A. The best enzyme activity enhancement was obtained for the same nonavalent compound, which increased 5.2-fold the activity of the misfolded enzyme at 2.5 μM, what constitutes the first example of a multivalent α-Gal A activity enhancer of potential interest in the treatment of Fabry disease.

Development of novel triazole based dendrimer supported spiroborate chiral catalysts for the reduction of (E)-O-benzyl oxime: an enantioselective synthesis of (S)-dapoxetine

A reusable dendrimer supported spiroborate catalysts 2 and 3 have been synthesized via a “click” chemistry and demonstrated as catalysts for the reduction of (E)-O-benzyl oxime 13 to synthesis of (S)-dapoxetine 14 with 94% ee and 46% overall yield.

Synthesis and catalytic application of glycodendrimers decorated with gold nanoparticles – reduction of 4-nitrophenol

Au–DSNPs and Au–DENPs with an average diameter of 7.2 and 4.0 nm have been synthesized and proved to be good catalysts for the reduction of 4-nitrophenol.

Luminescent Zn(ii)–terpyridine metal–organic gel for visual recognition of anions

Luminescent metal–organic gels (MOGs), which is comprised of zinc ion and Hcptpy, can widely differentiate anions in two steps, which is visible with the naked eye.

Triazole-acetate functionalized gold nanoparticles for colorimetric Pb(ii) sensing

New triazole-acetate functionalized gold nanoparticles (TTA–AuNPs) for sensitive and selective colorimetric detection of Pb²⁺ were developed.

Synthesis of chiral core based triazole dendrimers with m-terphenyl surface unit and their antibacterial studies

Antibacterial activity against Shigella dysenteriae, Staphylococcus aureus and Serratia marcescen was studied with S-BINOL based triazole dendrimers 1, 2 and 3 with m-terphenyl surface units. Supported by molecular docking studies, the activity dendrimer 2 was comparable to that of streptomycin.