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A tetrahydro-4H-(pyrrolo[3,4-d]isoxazol-3-yl)methanamine
scaffold was designed as a diamino derivative to stabilize parallel turn
conformations. Its synthesis took advantage of a [1,3]-dipolar cycloaddition
reaction between the nitrile oxide derived from the inexpensive enantiopure Lphenylalanine
and N-benzyl-3-pyrroline. Two diastereoisomers were formed,
whose distribution depends on the selected base. 3aR,6aS-Isomer is favored in
organic bases, which formation is driven by π-interactions. However, the above
interactions were significantly prevented using an inorganic base due to the
chaotropic effect of the cation, decreasing the amount of the above isomer.
Finally, we demonstrated that this isomer is able to stabilize parallel turn
conformations when inserted in short peptide sequences.

Aggregation of amyloid proteins is currently involved in more than 20 serious human diseases that are actually untreated, such as Alzheimer’s disease (AD). Despite many efforts made to target the amyloid cascade in AD,...

Rac1 GTPase interaction with guanine nucleotide exchange factor Tiam1 is involved in several cancer types and cardiovascular diseases.

Chem. Sci., 2017, 8, 1295–1302 DOI: 10.1039/C6SC03176E Alzheimer’s disease is a neurodegenerative disorder linked to oligomerization and fibrillization of amyloid b peptides, with Ab1–42 being the most aggregative and neurotoxic one. We report herein...