Bz-OSu is a benzoylated N-hydroxysuccinimide (OSu) ester derivative of benzoic acid, functioning as an activated carboxylate for acyl transfer chemistry rather than as a free amino acid. The molecule contains a benzoyl acyl group linked to the N-hydroxysuccinimide leaving group, featuring an ester linkage and an N-O moiety that can undergo nucleophilic acyl substitution under appropriate conditions, with stereochemistry not applicable to its structure. Bz-OSu is commonly employed in synthetic and bioconjugation workflows to introduce benzoyl groups onto nucleophilic amines (e.g., in peptide coupling or protein labeling contexts) and to prepare more complex benzoylated intermediates for analytical method development and chemical biology studies.
Bz-OSu is a benzoyl-protected N-hydroxysuccinimide (NHS) ester derivative formed from benzoic acid and the activated OSu leaving group. The molecule contains an aromatic benzoyl acyl moiety linked to an N-hydroxysuccinimide ester, providing an activated carboxylate equivalent that undergoes acyl transfer to nucleophiles such as primary amines and, under appropriate conditions, other nucleophilic sites. The presence of the succinimide ring stabilizes the leaving group during coupling, while the benzoyl group serves as a defined acyl handle for downstream functionalization and analytical tracking. As a chiral-independent activated acyl intermediate, Bz-OSu is commonly used in amino-acid derivative chemistry and peptide-related workflows where controlled acylation and subsequent transformations are required.
1. Amine Acylation Chemistry
Bz-OSu is applied in chemical biology and labeling workflows that require rapid, stoichiometric acylation of primary amines on amino acid derivatives, peptide fragments, or lysine-containing biomolecules. The activated NHS ester functionality enables efficient nucleophilic acyl substitution by amine groups, while the benzoyl group provides a stable, spectroscopically traceable modification for subsequent purification and characterization. Acylated products can be carried into peptide coupling sequences or used as protected intermediates for stepwise construction of amide linkages. Bz-OSu therefore functions as an acyl-transfer reagent that supports amino acid derivatization and biomolecule modification strategies in both research and applied manufacturing contexts.
2. Peptide Coupling Intermediates
Bz-OSu is suitable for peptide chemistry where benzoyl activation and controlled amide formation are needed prior to or alongside standard peptide coupling reagents. The OSu leaving group promotes acylation of N-terminal or side-chain amines on protected amino acids and peptide building blocks, enabling preparation of benzoylated intermediates that can be carried through iterative synthesis. The benzoyl group can also serve as a temporary acyl protecting or directing group for downstream transformations, depending on the protecting-group scheme used for the peptide backbone. Bz-OSu thus supports peptide building block preparation, intermediate generation, and synthetic planning in peptide science and peptidomimetic construction.
3. Bioconjugation Labeling
Bz-OSu can be employed in bioconjugation chemistry to introduce benzoyl modifications onto amine-bearing targets such as amino acid side chains, amine-functional polymers, or carrier proteins used for conjugate synthesis. The NHS ester activation pattern is compatible with workflows that aim to install defined acyl groups onto nucleophilic sites while minimizing uncontrolled reactions compared with less activated acyl derivatives. Benzoylated conjugates can then be used for assay development, affinity reagent preparation, or as chemically defined substrates for further derivatization. Bz-OSu therefore serves as a practical acylation reagent for molecular labeling and downstream conjugate manufacturing steps where reproducible functional group installation is required.
4. Analytical Derivatization Standards
Bz-OSu is used in analytical research to derivatize amines and generate benzoyl-protected derivatives for chromatographic separation and mass spectrometric identification. The benzoyl group provides a distinct mass signature and can improve detectability of amino groups derived from amino acids, peptide hydrolysates, or amine-containing analytes. NHS ester chemistry enables conversion of primary amines into stable amide derivatives that are suitable for method development and reference standard preparation. Bz-OSu thereby supports structure verification, compositional analysis, and analytical method robustness in amino acid and peptide characterization pipelines.
5. Process Chemistry Acyl Activation
Bz-OSu is relevant to process chemistry and specialty chemical production as an activated acyl intermediate that can be integrated into manufacturing routes requiring controlled acyl transfer to amine functionalities. The succinimide leaving group design supports predictable conversion of nucleophiles to benzoyl amide products, which can be advantageous when designing scalable derivatization steps for amino acid derivatives and peptide intermediates. The defined benzoyl handle can be used to tune downstream reactivity, enabling sequential transformations such as further protection/deprotection planning or conversion to alternative functional groups. Bz-OSu thus aligns with industrial intermediate preparation needs in fine chemical synthesis where activated ester chemistry is employed to manage coupling selectivity and downstream workup compatibility.
6. Polymer And Material Functionalization
Bz-OSu can be applied to functional materials and polymer modification where amine-containing polymers or surfaces are benzoylated to introduce defined acyl functionality. The activated NHS ester reacts with pendant primary amines, allowing incorporation of benzoyl groups that can later participate in secondary coupling reactions or serve as chemical handles for material characterization. Benzoylation can also influence surface chemistry and interfacial interactions relevant to coatings, adsorbent materials, or functional polymer building blocks. Bz-OSu therefore supports amino-acid-derived acylation concepts extended to industrial polymer functionalization and specialty material synthesis.
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