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HONGKUN / PRODUCT DIRECTORY

Piperidine-4-carboxylic acid | CAS 498-94-2

An unprotected piperidine building block carrying a carboxylic acid opposite the ring nitrogen, useful in documented medicinal-chemistry derivatisation and requiring careful distinction from positional isomers, esters and nitrogen-protected materials.

CAS498-94-2
Molecular formulaC6H11NO2
Molecular weight129.16 g/mol

Product overview

Piperidine-4-carboxylic acid, also called isonipecotic acid, combines a secondary ring amine with a carboxyl group opposite the nitrogen. These two functional sites allow separate choices for protection and derivatisation in medicinal-chemistry routes. The free, unprotected acid differs from its esters and N-protected derivatives, as well as from the 2- and 3-carboxylic positional isomers. Carbon 4 has equivalent ring paths in this parent structure and is not an R/S stereocentre. Qualification should establish the 4-carboxylic identity, chemical form and assay before route-specific evaluation.

Chemical identity

Chemical name
Piperidine-4-carboxylic acid
CAS number
498-94-2
Molecular formula
C6H11NO2
Molecular weight
129.16 g/mol

Application context

Isonipecotic acid is used as a building block in medicinal-chemistry research, including preparation of piperidine hydroxamic-acid derivatives investigated as HDAC inhibitors. The saturated ring supplies nitrogen and carboxyl functionality for constructing these derivatives. Route design may use protection or esterification to address one functional group at a time. State whether the receiving step calls for the unprotected acid or a derivative, and specify positional-isomer controls. Evaluate any required reaction performance separately from chemical assay.

Chemistry and synthetic role

The carboxyl group lies opposite the ring nitrogen. Each functional group can participate in different derivatisation strategies; protection status and acid-versus-ester form therefore determine what enters a synthesis. No chiral centre is assigned to C4 in this parent ring.

Quality review

Confirm the 4-carboxy position

Distinguish isonipecotic acid from pipecolic and nipecotic acids using structure-sensitive identity evidence.

Verify unprotected acid form

Confirm that neither nitrogen protection nor esterification is present; check salt composition if a different form is proposed.

Use a justified assay basis

Agree a content method and water basis suitable for this amino acid. Do not add an enantiomeric-purity requirement solely because it contains a piperidine ring.

Preparing a specification

Specify unprotected piperidine-4-carboxylic acid, CAS 498-94-2, with identity, assay method, related positional isomers and water as required. State explicitly if a salt, ester or protected derivative is actually needed, since these are separate materials.

Packaging and storage

Packaging format, closure and net weight should be agreed for the selected grade, order quantity and destination. Request the actual supplier SDS and confirm its storage and transport instructions before receipt.

Documentation

Request batch COA, SDS and the analytical specification. Confirm availability of spectra establishing the 4-substituted ring and data distinguishing the parent acid from protected or esterified species.

Procurement questions

Is isonipecotic acid another name for this product?

Yes. It denotes piperidine-4-carboxylic acid.

Should the RFQ ask for an R or S grade?

The unsubstituted parent has equivalent ring paths at C4 and no R/S centre there; a chiral derivative would require a different identity.

Can an N-Boc or ester derivative replace it?

Only after changing the route specification; those derivatives do not have the same functional-group availability.

Technical sources
  1. PubChem CID 3773NCBI / PubChem
  2. Isonipecotic acid I18008Sigma-Aldrich
  3. Amino acids and peptide synthesis reagents: Isonipecotic acid I0256Tokyo Chemical Industry