H-D-cycPentAla-OH

H-D-cycPentAla-OH is a D-configured cyclopentyl-substituted alanine analog in which the amino acid backbone bears a chiral stereocenter at the α-carbon and a free carboxylic acid for downstream coupling chemistry. The N-terminus is presented as an N-protonated amino functionality (H-D-), while the side chain contains a cyclopentyl group that provides a hydrophobic, conformationally biased steric environment distinct from straight-chain alkyl alanine derivatives. The combination of a stereodefined D-amino acid core and an unprotected carboxylic acid enables direct participation in peptide coupling workflows after activation, while the cyclopentyl side chain can modulate local folding and binding-site shape in peptide and peptidomimetic contexts. As a chiral amino acid scaffold, H-D-cycPentAla-OH functions as a stereochemically controlled intermediate for building D-amino acid-containing sequences and for preparing derivatives that retain the cyclopentyl hydrophobic motif.

1. Peptide Synthesis

H-D-cycPentAla-OH is used in peptide synthesis workflows where D-amino acid incorporation is required to tune proteolytic stability and stereochemical recognition. The α-amino and α-carboxyl functional groups support standard peptide coupling chemistry after carboxyl activation, enabling formation of amide bonds with protected amino acid partners. The D-configuration at the backbone stereocenter allows stereocontrolled assembly of D-rich segments, while the cyclopentyl side chain can influence steric packing and conformational preferences in the growing chain. The resulting D-cycPentAla-containing peptides can serve as research-grade building blocks for sequence optimization and for generating analog libraries in peptide science and peptidomimetic development.

2. Peptidomimetics And SAR

H-D-cycPentAla-OH is applied in peptidomimetic construction and structure-activity relationship studies where side-chain hydrophobicity and stereochemistry are key variables. The cyclopentyl side chain provides a bulky, conformationally constrained alkyl motif that can be used to probe binding-site hydrophobic pockets and steric tolerance. The D-amino acid backbone enables systematic SAR exploration of how inversion of stereochemistry affects conformational ensembles and receptor or enzyme recognition without changing the overall functional group pattern of the peptide scaffold. Downstream derivatization into protected or activated forms supports rapid synthesis of analog series for SAR-driven optimization in medicinal chemistry research.

3. Protected Amino Acid Chemistry

H-D-cycPentAla-OH is suitable for conversion into N-protected amino acid derivatives and activated carboxylic acid intermediates used in protected amino acid synthesis. The free carboxylic acid enables formation of ester or activated acid derivatives, while the α-amino functionality can be protected to control chemoselectivity during multi-step peptide building block preparation. The D stereocenter is preserved through protection and activation strategies, supporting stereochemically consistent incorporation into peptide couplings. Prepared derivatives derived from H-D-cycPentAla-OH can be used as standardized inputs for automated peptide assembly and for manufacturing-oriented intermediate preparation where reproducible coupling behavior is required.

4. Chemical Biology Probes

H-D-cycPentAla-OH is employed in chemical biology research to generate D-amino acid-containing probes and affinity elements that resist enzymatic degradation. The cyclopentyl side chain can be leveraged to tune hydrophobic interactions in target engagement assays, while the D-configuration supports stability against protease cleavage in peptide-based probes. The carboxylic acid functionality enables downstream formation of amide-linked handles for conjugation to carriers, linkers, or detection tags after appropriate activation. The resulting D-cycPentAla-modified biomolecular constructs can be used to study molecular recognition, binding kinetics, and substrate specificity in enzyme and receptor-focused investigations.

5. Pharmaceutical Intermediate Preparation

H-D-cycPentAla-OH is used as a chiral amino acid intermediate in pharmaceutical-manufacturing-oriented fine chemical synthesis routes that require D-amino acid incorporation. The amino acid functionality supports conversion into coupling-ready intermediates, including protected forms and activated carboxyl derivatives, which can be integrated into controlled peptide fragment assembly. The cyclopentyl side chain provides a hydrophobic element that can be maintained through intermediate transformations to ensure that the stereochemically defined building block reaches the final peptide or peptidomimetic stage with the intended side-chain identity. Process chemistry teams can apply this scaffold to produce D-amino acid segments for larger synthetic sequences, including fragment coupling and stepwise construction of stereodefined peptide intermediates.

6. Analytical Standards and Method Development

H-D-cycPentAla-OH is applicable in analytical research as a stereochemically defined amino acid standard for method development and impurity profiling in peptide and amino acid analysis. The defined D-configuration and cyclopentyl side chain provide a distinct chromatographic and derivatization signature relative to L analogs and to non-cyclopentyl alanine derivatives. The free carboxylic acid and amino functionality allow derivatization strategies for LC-MS, GC-MS, or chromatographic quantification workflows that require unambiguous stereochemical reference points. Prepared analytical derivatives or reference materials derived from H-D-cycPentAla-OH can support validation of peptide coupling performance, monitoring of racemization risk, and characterization of D-amino acid-containing intermediates in applied analytical chemistry.

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