What makes hydroxamic acids unique?

More than just amides, hydroxamic acids are N-hydroxy amides characterized by an N–OH group and distinct reactivity compared with conventional amides. They are weak diprotic acids that exist in keto and iminol tautomeric forms.

In aqueous solution, the hydroxyl group loses its first proton with a pKa of 8.5–9.5. Substitution of the N–H proton with an electron-donating group (EDG), such as an alkyl or aryl group, decreases the pKa. Hydroxamic acids can coordinate metal ions such as Zn(II) through both oxygen atoms, typically forming bidentate O,O′ complexes.

A prominent example is vorinostat (SAHA), a hydroxamic acid-containing histone deacetylase (HDAC) inhibitor. Its hydroxamate group coordinates the catalytic Zn(II) ion within the HDAC active site, contributing to enzyme inhibition. (https://lnkd.in/gHkt6fBH)

Beyond HDAC inhibitors, hydroxamic acid motifs have been explored in the development of inhibitors targeting other zinc-dependent enzymes. By combining tunable acidity, strong metal-binding ability, and versatile molecular structures, hydroxamic acids offer valuable opportunities for developing bioactive compounds and exploring metal-dependent biological processes.

🔎 𝐄𝐱𝐩𝐥𝐨𝐫𝐞 𝐀𝐦𝐁𝐞𝐞𝐝’𝐬 𝐡𝐲𝐝𝐫𝐨𝐱𝐚𝐦𝐢𝐜 𝐚𝐜𝐢𝐝𝐬 𝐟𝐨𝐫 𝐲𝐨𝐮𝐫 𝐫𝐞𝐬𝐞𝐚𝐫𝐜𝐡: https://www.arctomsci.com

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Source: AmBeed LinkedIn post
LinkedIn publication date: 2026-10-31 (UTC, derived from the activity ID).