1,3,4-Oxadiazoles for Crystal Engineering. Convenient Synthesis and Self-Assembly: Nonchiral Chains versus Chiral Helices
摘要:
A series of new 1,3,4-oxadiazoles containing carboxylic and halogen groups and a double bond have been synthesized in good yields and a multigram scale. This was achieved at room temperature from readily available 1,2-diacylhydrazines using a cheap condensation reagent (the solution of P2O5 in H2SO4). Single-crystal X-ray diffraction analysis has shown that all studied 1,3,4-oxadiazole-containing acids are self-assembled by intermolecular H-bonds into supramolecular zigzag chains or helices, depending on the tecton molecular structure and the type of H-bonding. Factors affecting helix formation have been found, and a Cambridge Structural Database (CSD) survey has been performed to support these findings. Moreover, it has been demonstrated that the tuning of the crystal structure leading to spontaneous symmetry breaking for supramolecular helices based on nonchiral molecules is possible even by as little change in molecular structure as a shift from an isopropyl substituent to a cyclopropyl. Subsequently, the studied 1,3,4-oxadiazole-containing acids and related compounds are found to be easily accessible building blocks for crystal engineering of new chiral materials with tunable supramolecular arrangement.
[EN] BIARYL-PROPIONIC ACID DERIVATIVES AND THEIR USE AS PHARMACEUTICALS<br/>[FR] DÉRIVÉS D'ACIDE BIARYL-PROPIONIQUE ET LEUR UTILISATION EN TANT QUE PRODUITS PHARMACEUTIQUES
申请人:SANOFI SA
公开号:WO2014154727A1
公开(公告)日:2014-10-02
The present invention relates to compounds of the formula (I), wherein X, R, R1, R2, D, E1, E2, E3, E4, G1, G2, G3 and G4 have the meanings indicated in the claims, which are valuable pharmaceutical active compounds. They are inhibitors of the protease cathepsin A, and are useful for the treatment of diseases such as atherosclerosis, heart failure, renal diseases, liver diseases or inflammatory diseases, for example. The invention furthermore relates to processes for the preparation of the compounds of the formula (I), their use and pharmaceutical compositions comprising them.