D-pyrrolidine-3-carboxylic acid is a cyclic, non-proteinogenic amino acid characterized by a pyrrolidine ring bearing a carboxylic acid at the 3-position and an amino group on the ring. The molecule contains a zwitterionic amino and carboxyl functionality and, as indicated by the D designation, is specified in the D stereochemical form, which can influence conformational preferences and diastereomeric outcomes in derivative formation. In synthesis and chemical biology workflows, it is used as a building block or conformationally constrained amino acid analogue for preparing modified peptides, studying structure-activity relationships, and generating analytical standards or labeled/derivatized analogues for method development.
CAT No: CP23202
D-pyrrolidine-3-carboxylic acid is a D-configured, cyclic amino acid featuring a pyrrolidine ring with a stereogenic center at C-3 and a carboxylic acid functionality suited for amino acid chemistry workflows. The constrained ring geometry influences conformational preference and can affect coupling kinetics and downstream stereochemical outcomes during peptide bond formation. The free carboxyl group enables activation for amide formation, while the ring nitrogen can be protected or functionalized to tune reactivity and chemoselectivity. As a chiral amino acid intermediate, it can be converted into protected derivatives, activated esters, or side-chain-modified analogs that support peptide building block preparation and stereocontrolled synthesis of amino acid derivatives.
1. Peptide Synthesis
D-pyrrolidine-3-carboxylic acid is applied in peptide synthesis and peptidomimetic construction where a cyclic, D-configured residue is incorporated to impose backbone rigidity. The carboxylic acid group participates in standard peptide coupling chemistry after conversion to an activated acid derivative, while the pyrrolidine ring provides a conformationally restricted side-chain environment that can influence amide bond geometry and local structure. Protection strategies for the ring nitrogen, together with C-terminus activation, enable controlled assembly of short peptides and peptide analogs using standard coupling/deprotection sequences. Downstream, the resulting D-pyrrolidine-containing peptides can serve as research-grade scaffolds for studying stereochemical effects on folding and binding modes in peptide science.
2. Chiral Building Blocks
D-pyrrolidine-3-carboxylic acid is used as a chiral amino acid intermediate for stereoselective synthesis of D-configured derivatives and constrained analogs. The presence of a single defined stereocenter at C-3, combined with the cyclic pyrrolidine framework, supports predictable stereochemical transfer when the carboxyl group is activated and coupled or transformed into protected esters. N-protection and selective functional group interconversions can be employed to generate protected amino acid derivatives compatible with iterative synthesis, including routes that require orthogonal deprotection logic. The compound's structural constraint makes it suitable for building chiral libraries of amino acid esters, amides, and peptide-ready intermediates used in synthetic organic chemistry and chiral method development.
3. Chemical Biology Research
D-pyrrolidine-3-carboxylic acid is utilized in chemical biology and molecular design efforts that require incorporation of noncanonical amino acid motifs into bioactive or recognition-focused constructs. The carboxylic acid functionality enables attachment to biomolecule-reactive handles after derivatization to activated esters or amide-forming intermediates, while the pyrrolidine ring can act as a sterically defined substituent that modulates molecular recognition. Ring nitrogen protection and subsequent deprotection strategies can be aligned with conjugation workflows to maintain chemoselectivity during biomolecule labeling or probe construction. Downstream applications include generation of peptidomimetic probes and stereochemically defined analogs for structure-activity relationship studies and biochemical target interrogation.
4. Pharmaceutical Intermediate Preparation
D-pyrrolidine-3-carboxylic acid is applied as a process chemistry intermediate for manufacturing routes that require chiral, cyclic amino acid building blocks for medicinal chemistry programs. The free carboxylic acid can be converted into protected forms and activated derivatives that feed into amide bond formation steps, supporting synthesis of drug-like heterocycle-containing fragments and peptide-like scaffolds. The D-configuration and constrained ring can be leveraged to control stereochemical outcomes in downstream coupling and to generate consistent intermediate profiles for fine chemical synthesis. Industrially relevant derivative formation includes preparation of protected amino acid intermediates, chiral esters, and coupling-ready acid derivatives that integrate into multi-step pharmaceutical intermediate production.
5. Analytical Standards Development
D-pyrrolidine-3-carboxylic acid is used in analytical research to support method development and stereochemical verification for amino acid derivative workflows. The defined D-stereochemistry and stable carboxylic acid functionality make it suitable as a reference material when monitoring derivatization, activation, or coupling outcomes in peptide building block synthesis. Conversion to protected derivatives or labeled analogs can be used to generate analytical standards that track specific functional group transformations, including carboxyl activation and N-protection states. Downstream, the compound supports quality control and characterization strategies for chiral amino acid intermediates, peptide analogs, and related process chemistry intermediates where stereochemical integrity is required.
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