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(S)-Tetrahydrofuran-2-carboxylic acid | CAS 87392-07-2

A chiral cyclic-ether carboxylic acid used in published medicinal-chemistry amide construction, supplying an S-configured tetrahydrofuran-2-carbonyl fragment whose ring position and stereochemistry should remain explicit throughout material qualification.

CAS87392-07-2
Molecular formulaC5H8O3

Product overview

The carboxyl group sits next to the ether oxygen in the five-membered ring of this S-configured building block. CAS 87392-07-2 identifies (S)-tetrahydrofuran-2-carboxylic acid, also listed as (S)-(−)-tetrahydro-2-furoic acid. It is a free acid, not an ester or a salt. The 2-position places the defined stereocentre at the substituted ring carbon and differentiates this material from tetrahydrofuran-3-carboxylic acid. Its verified application context is the assembly of research compounds through the carboxyl group. Buyers should match the 2S fragment and free-acid form to their intended amide structure, with chemical assay and enantiomeric composition treated as separate qualification criteria rather than inferred from a shared ring-family name.

Chemical identity

Chemical name
(S)-Tetrahydrofuran-2-carboxylic acid
CAS number
87392-07-2
Molecular formula
C5H8O3

Application context

(S)-Tetrahydrofuran-2-carboxylic acid is used in medicinal-chemistry research to introduce a chiral cyclic-ether acyl fragment. Published examples couple it with substituted piperidine-containing amines to form amides bearing the S tetrahydrofuran-2-carbonyl group. Match the C2 attachment and S configuration to the target amide. Qualification can focus on free-acid content, enantiomeric composition and related acid or ester species relevant to the amidation.

Chemistry and synthetic role

A saturated five-membered cyclic ether carries the carboxyl substituent at C2. Conversion of the acid functionality into an amide is documented in research routes; the S ring centre defines which chiral acyl fragment is introduced.

Quality review

Identify the 2S fragment

Agree a method distinguishing the required S material from the R enantiomer.

Exclude ring-position ambiguity

Retain '2-carboxylic acid' in the order and structural confirmation; the 3-isomer is a different building block.

Confirm the free-acid state

Agree assay, water and relevant ester-related criteria for the planned amidation, with defined methods and acceptance limits.

Preparing a specification

Include the S structure, CAS 87392-07-2 and free-acid form. Specify chemical assay, enantiomeric criterion and positional identity. Agree water or ester-related controls where relevant to the selected amide-forming step.

Packaging and storage

Confirm packaging format, net weight and transport arrangements for the selected grade, quantity and destination. Agree storage and handling conditions using the actual supplied material’s SDS and label.

Documentation

Request COA, SDS, identity spectra and the chiral method. Confirm that documents refer to the 2-carboxylic acid rather than a ring-position isomer, ester or salt.

Procurement questions

Is tetrahydrofuran-3-carboxylic acid equivalent?

No. Moving the carboxyl substituent changes the fragment's connectivity.

What fragment does the acid provide in the research amides?

It supplies the S tetrahydrofuran-2-carbonyl fragment; match both position and configuration to the target.

Is negative rotation sufficient to confirm S?

Use rotation with its measurement conditions and appropriate structural or chiral evidence, not as a standalone assignment.

Technical sources
  1. PubChem CID 446666: properties and CAS synonymsNCBI / NLM / NIH
  2. (S)-(−)-Tetrahydro-2-furoic acid T1741Tokyo Chemical Industry
  3. TW201714884A — Novel compoundsTaiwan patent publication / Google Patents