Syntheses, activity and modeling studies of 3- and 4-(sulfo- and sulfonamidoalkyl)pyridine and piperidine-2-carboxylic acid derivatives as analogs of NMDA receptor antagonists

Development of Efficient Covalent Inactivators of a Fungal Aspartate Semialdehyde Dehydrogenase

Aspartate semialdehyde dehydrogenase (ASADH) catalyzes the second step in the fungal pathway towards the synthesis of threonine, isoleucine, and methionine, and it has been identified as a viable target for antifungal drug development. Our previous work produced a group of vinyl sulfones that function as irreversible covalent inactivators of this enzyme. We have now expanded this initial set to produce vinyl sulfones with higher kinetic efficiency as covalent inactivators of ASADH purified from the pathogenic fungal species Candida albicans. The catalytic efficiency of these inactivators has also been compared to related classes of irreversible inactivators, vinyl sulfonamides, acrylamides, and sulfonyl ketones.

2-Ethylpiperidinium chloride

In the title molecular salt, C₇H₁₆N⁺·Cl⁻, the piperidinium ring adopts a chair conformation. In the crystal, the two components are connected by N—H⋯Cl and C—H⋯Cl hydrogen bonds, forming a supra­molecular double-chain structure along the c axis.

(2,6-Difluorophenyl)(4-methylpiperidin-1-yl)methanone

In the title compound, C₁₃H₁₅F₂NO, the piperidine ring adopts a chair conformation. The dihedral angle between the least-squares plane of the piperidine ring and the benzene ring is 48.75 (7)°. In the crystal structure, the mol­ecules are connected via C—H⋯O hydrogen bonds, forming a zigzag chain along the b axis.