DL-Cyclopentylalanine is a racemic (DL) non-proteinogenic amino acid characterized by an α-amino and carboxyl group attached to a cyclopentyl-containing side chain, placing it in the class of aliphatic amino acids. The molecule bears a primary amino functional group and a carboxylic acid functionality, and its stereochemical form is specified as a mixture of enantiomers consistent with the "DL" designation. As a free amino acid building block, it is used in peptide and peptidomimetic synthesis to introduce a cyclopentyl side chain for structure-property studies, conformational effects, and analog preparation in chemical biology and analytical method development.
CAT No: CP21403
DL-Cyclopentylalanine is a racemic (DL) amino acid featuring a stereogenic α-carbon and a cyclopentyl side chain that increases hydrophobic character relative to alanine while maintaining the canonical amino acid backbone. The molecule contains a free amino group and a carboxylic acid, enabling straightforward acid-base behavior and participation in standard amino acid coupling chemistry. The cyclopentyl moiety provides conformationally constrained hydrophobic surface suitable for building peptide analogs and for tuning binding pockets in structure-activity relationship studies. As a chiral amino acid intermediate, DL-Cyclopentylalanine can be resolved or converted into protected derivatives to support controlled peptide bond formation and downstream functional transformations.
1. Peptide Synthesis
DL-Cyclopentylalanine is applied in peptide building workflows where an amino acid with a hydrophobic cyclopentyl side chain is required to modulate folding propensity and side-chain packing in peptide sequences. The free amino and carboxyl functionalities support conversion into N-protected amino acid derivatives and activation of the carboxylic acid for peptide coupling, including compatibility with common coupling reagents used in protected amino acid synthesis. Racemic DL material can be used for generating non-stereodefined peptide libraries, while stereochemically defined analogs may be produced through resolution prior to incorporation. Downstream peptide products and peptidomimetics derived from this amino acid can serve as research-grade scaffolds for studying sequence-dependent properties and for preparing material-relevant hydrophobic segments.
2. Chiral Resolution Intermediates
DL-Cyclopentylalanine is suitable as a chiral starting point for developing enantioenriched cyclopentylalanine derivatives used in stereoselective synthesis. The presence of a single stereocenter at the α-carbon allows conversion into diastereomeric salts or protected forms that can be separated to obtain the desired stereoisomer for stereochemically defined peptide building blocks. The amino acid backbone supports protecting-group strategies such as N-protection and carboxyl activation, enabling subsequent coupling steps without racemization under appropriate conditions. Enantioenriched cyclopentylalanine obtained from this feedstock can be used to prepare chiral intermediates for medicinal chemistry and for systematic stereochemical SAR studies.
3. Side-Chain Functionalization
DL-Cyclopentylalanine is employed in synthetic organic chemistry and chemical biology as a hydrophobic amino acid platform for side-chain derivatization and property tuning. The cyclopentyl side chain can be leveraged as a conformationally restricted substituent during the synthesis of analogs that vary steric bulk and lipophilicity while retaining the amino acid recognition elements. The amino and carboxyl groups can be protected or transformed into activated intermediates to enable selective modification at the side chain or to generate functionalized derivatives that participate in further coupling or conjugation chemistry. Resulting cyclopentylalanine-based intermediates can be incorporated into peptidomimetics, labeling handles, or other downstream constructs where hydrophobic side-chain engineering is required.
4. SAR Studies And Molecular Design
DL-Cyclopentylalanine is utilized in structure-activity relationship studies and fragment-based molecular design where hydrophobic amino acid substitutions help probe binding pocket shape and nonpolar interaction patterns. The cyclopentyl group provides a rigid, bulky hydrophobe that can be incorporated into peptide-like scaffolds to assess how steric constraints influence target recognition. The amino acid backbone supports conversion into protected building blocks for controlled peptide coupling, enabling systematic replacement of residues in analog panels. Racemic incorporation can support early-stage library generation, while stereodefined follow-up analogs can be prepared from resolved derivatives to separate stereochemical effects on molecular recognition.
5. Pharmaceutical Intermediate Preparation
DL-Cyclopentylalanine is applied as an amino acid intermediate for manufacturing-oriented synthesis routes that require hydrophobic residue incorporation into protected amino acid derivatives and peptide intermediates. The functional amino acid groups enable stepwise protection and activation strategies that align with industrial amino acid chemistry, including preparation of N-protected forms and carboxyl-activated derivatives suitable for downstream assembly. The cyclopentyl side chain can be carried through synthesis without introducing additional reactive heteroatoms, which may simplify purification profiles in multi-step intermediate production. Downstream products include protected peptide fragments and amino acid-derived intermediates used in fine chemical synthesis and applied process chemistry for constructing peptide-based or peptidomimetic structures.
6. Analytical Standards And Method Development
DL-Cyclopentylalanine is suitable for analytical research and method development where an amino acid reference material is needed to validate derivatization, chromatographic separation, or mass spectrometric identification of cyclopentylalanine-containing species. The racemic nature provides a defined standard for assessing enantiomeric separation performance when chiral chromatography or chiral derivatization strategies are evaluated. The amino acid's carboxylic acid and amine functionalities facilitate common analytical workflows that convert it into detectable derivatives while preserving structural identity. Analytical standards derived from DL-Cyclopentylalanine can support quality control of peptide building block preparations, monitoring of coupling outcomes, and characterization of amino acid incorporation in research-grade peptide materials.
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