L-Piperidine-2-carboxylic acid is a cyclic, non-aromatic amino acid derivative in which the amino acid backbone is incorporated into a piperidine ring, with a carboxylic acid substituent at the 2-position. The molecule contains a primary amino group and a carboxyl functional group, and its stereochemical form is indicated by the "L-" designation while the side chain is constrained by the ring to present a defined three-dimensional geometry. In research and synthesis, it is used as a building block for preparing substituted amino acid and peptide analogues, including structure-activity studies and chemical biology probes where conformational restriction can be used to modulate backbone presentation.
CAT No: CP22501
CAS No:3105-95-1
Synonyms/Alias:l-Pipecolicacid;3105-95-1;(S)-Piperidine-2-carboxylicacid;L-Homoproline;L-Pipecolinicacid;(S)-(-)-2-Piperidinecarboxylicacid;(S)-pipecolicacid;L-pipecolate;l-piperidine-2-carboxylicacid;(l)-pipecolicacid;l(-)-pipecolinicacid;(2S)-piperidine-2-carboxylicacid;(-)-Pipecolicacid;l-homopro;(S)-2-Piperidinecarboxylicacid;L-Pipecolinate;h-homopro-oh;L-(-)-Pipecolinicacid;h-hopro-oh;(S)-(-)-pipecolicacid;(S)-Pipecolinate;(-)-Pipecolate;L-(-)-Pipecolate;(S)-Pipecolinicacid;(S)-pipecolate
L-Piperidine-2-carboxylic acid is a cyclic, conformationally constrained amino acid analog featuring a piperidine ring with a stereogenic carbon at the 2-position and a carboxylic acid functional group. The secondary amine embedded in the ring provides a basic, nucleophilic site that can participate in acylation, salt formation, and selective derivatization, while the carboxyl group supports amide bond formation and coupling chemistry. The defined ring geometry and chiral center enable stereochemically controlled incorporation into peptide-like frameworks, including peptidomimetic scaffolds where conformational restriction can influence binding and reactivity. As an amino acid-based intermediate, L-piperidine-2-carboxylic acid can be protected at the ring nitrogen and activated at the carboxyl terminus to support downstream synthesis of amides, N-alkylated derivatives, and heterocycle-functionalized building blocks.
1. Peptidomimetic Synthesis
L-Piperidine-2-carboxylic acid is applied in peptidomimetic and constrained peptide chemistry where a ring-containing amino acid mimic replaces or modifies standard residues. The carboxylic acid enables peptide coupling to form amide linkages, while the piperidine nitrogen can be protected (for example, as an N-acyl or N-carbamate derivative) to control chemoselectivity during chain assembly. Stereochemical fidelity at the 2-carboxyl-bearing carbon supports the construction of defined analog series for peptide analog libraries. Downstream derivatives can be used to generate amide-linked scaffolds for structure-activity relationship studies and synthetic methodology development in peptide coupling chemistry.
2. Chiral Building Block Development
L-Piperidine-2-carboxylic acid serves as a chiral amino acid intermediate for stereoselective synthesis of nitrogen-containing chiral fragments. The single stereocenter at C-2 and the rigid piperidine framework provide a defined three-dimensional arrangement that can be carried through to amide formation, esterification, or conversion into activated intermediates. Protection and deprotection strategies targeting the ring nitrogen allow sequential functional group manipulation without perturbing the carboxyl stereocenter. The resulting chiral intermediates can be employed in medicinal chemistry workflows that require consistent stereochemistry across analog sets and in industrial fine chemical synthesis of stereopure amide-containing compounds.
3. Side-Chain Functionalization
L-Piperidine-2-carboxylic acid is utilized for side-chain functionalization and derivatization of piperidine-containing amino acid analogs. The ring secondary amine can undergo controlled N-alkylation, N-acylation, or conversion to protected forms that modulate basicity and reactivity, while the carboxyl group can be transformed into esters, activated acids, or amide derivatives for further elaboration. Functional group interconversions enable access to N-substituted piperidine carboxylates, carboxamide analogs, and bifunctional intermediates suitable for sequential coupling steps. Downstream synthetic utility includes preparation of functionalized scaffolds for combinatorial chemistry, molecular design, and chemical biology probe construction.
4. Pharmaceutical Intermediate Preparation
L-Piperidine-2-carboxylic acid is relevant to pharmaceutical intermediate preparation and process chemistry for nitrogen-rich building blocks used in amide and heterocycle-containing synthesis. The amino acid motif provides a handle for carboxyl activation and coupling, while the piperidine nitrogen supports salt formation and protected-nitrogen strategies that can be tuned to withstand coupling and purification conditions. Conversion to protected amino acid derivatives enables controlled incorporation into larger molecules through standard amide bond-forming steps, supporting scalable manufacturing routes for fine chemicals. The compound's structural features make it suitable for producing chiral, amide-bearing intermediates used downstream in synthesis planning for complex, industrially manufactured chemical entities.
5. Analytical Research Standards
L-Piperidine-2-carboxylic acid can be used in analytical research as a stereochemically defined reference material for amino acid derivative quantification and method validation. The presence of a carboxylic acid and a ring nitrogen allows formation of derivatized standards and calibration compounds compatible with chromatographic and mass spectrometric detection strategies. Protection-dependent stability differences between free acid and N-protected forms can be exploited to support method development for distinguishing related piperidine carboxylic acids and peptide-like fragments. Downstream use includes preparation of analytical standards for monitoring amino acid derivatization steps, verifying stereochemical integrity in chiral synthesis workflows, and supporting impurity profiling in intermediate-focused quality assessment.
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