H-DL-beta-(2-Thienyl)-DL-Ser-OH

H-DL-beta-(2-Thienyl)-DL-Ser-OH is a DL-serine-derived amino acid bearing a β-substituted 2-thienyl group, presented as a free carboxylic acid with an N-terminal hydrogen. The molecule contains a stereogenic center at the serine α-position and an additional stereochemical element associated with the β-substitution, yielding a racemic mixture that can be resolved or carried through as a DL intermediate depending on the synthetic plan. The side-chain architecture combines a hydroxymethyl functionality characteristic of serine chemistry with a thiophene ring that introduces aromatic heteroatom electronics and distinct conjugation behavior. As an amino acid with a reactive alcohol and an unprotected amine, H-DL-beta-(2-Thienyl)-DL-Ser-OH participates in standard peptide coupling workflows after appropriate N-protection and can serve as a chiral or achiral building block for downstream derivatization, heteroaryl incorporation, and peptide analog construction.

1. Peptide Synthesis

H-DL-beta-(2-Thienyl)-DL-Ser-OH is suitable for peptide building block preparation in solid-phase or solution-phase peptide synthesis where serine-like side-chain hydroxyl chemistry and amino acid backbone coupling are required. The free carboxylic acid and amino functionality enable conversion into an activated coupling partner after N-protection, while the β-(2-thienyl) substituent can be retained to introduce heteroaryl character into peptide sequences or peptidomimetics. The hydroxymethyl group can be selectively protected or transformed to accommodate orthogonal deprotection strategies during stepwise chain assembly. Incorporation of the thiophene-bearing β-substituent can generate peptide analogs with altered conformational preferences and aromatic interaction motifs, supporting scaffold diversification in amino acid chemistry and peptide science.

2. Side-Chain Functionalization

H-DL-beta-(2-Thienyl)-DL-Ser-OH supports side-chain functionalization programs that exploit the serine-derived hydroxymethyl group and the heteroaryl thiophene ring. The alcohol can be derivatized through protection as an ether or ester, enabling controlled reactivity during multi-functional molecule synthesis, while the thiophene can participate in electrophilic substitution, cross-coupling, or oxidative transformations depending on the chosen conditions. The presence of an unprotected amine and free acid allows conversion into protected intermediates for sequential modification, including N-protection to prevent undesired coupling during side-chain derivatization. Downstream products can include thiophene-functional peptide fragments, heteroaryl-tagged amino acid derivatives, and functionalized intermediates used for chemical biology probes and synthetic organic chemistry routes.

3. Chiral Building Block Development

H-DL-beta-(2-Thienyl)-DL-Ser-OH serves as a chiral amino acid intermediate candidate for stereochemical refinement when enantioenriched material is required for stereodefined peptide analogs. The DL configuration at the amino acid stereocenter(s) makes the compound compatible with resolution strategies or asymmetric downstream transformations that can establish a defined stereochemical outcome for peptide coupling and structure-activity relationship studies. N-protection and selective side-chain protection can be employed to preserve stereochemical integrity through coupling and derivatization steps, while the thiophene substituent provides a rigid aromatic element that can be used to probe stereochemical effects on molecular recognition. Enantioenriched derivatives prepared from this racemic precursor can be incorporated into synthetic peptide libraries and stereochemically controlled peptidomimetic scaffolds.

4. Chemical Biology Probes

H-DL-beta-(2-Thienyl)-DL-Ser-OH can be applied in chemical biology research where amino acid-derived probes require both peptide compatibility and heteroaryl functionality for binding or labeling. The serine-like hydroxymethyl group enables conjugation handles after protection and functional group conversion, supporting attachment of linkers, affinity tags, or reporter moieties while maintaining an amino acid backbone for incorporation into peptide constructs. The thiophene ring introduces a distinct aromatic heteroatom environment that can influence hydrophobic contacts and π-interaction patterns in target-binding experiments. N- and O-protection strategies allow controlled assembly of probe-bearing peptide fragments, which can be used to generate labeled biomolecule analogs, investigate molecular interactions, and support biochemical research intermediate preparation.

5. Pharmaceutical Manufacturing Intermediates

H-DL-beta-(2-Thienyl)-DL-Ser-OH is relevant to pharmaceutical intermediate preparation workflows that require amino acid-derived heteroaryl building blocks compatible with established peptide coupling chemistry. The free carboxylic acid and primary amine allow conversion to protected forms suitable for reproducible activation, while the hydroxymethyl group can be managed via protection to prevent side reactions during multi-step synthesis. The β-(2-thienyl) substitution provides a heteroaryl motif that can be carried into drug-like peptide fragments or peptidomimetic intermediates, supporting downstream synthetic routes that assemble larger active-molecule scaffolds. Process chemistry planning can leverage orthogonal protection and controlled functional group transformations to generate consistent intermediates for fine chemical synthesis and specialty chemical production.

6. Analytical Standards And SAR Studies

H-DL-beta-(2-Thienyl)-DL-Ser-OH can be utilized to prepare analytical standards and reference materials for amino acid derivatization workflows, including LC-MS method development and stereochemical monitoring of peptide intermediates. The combination of amino acid functionality and thiophene aromaticity provides strong detectability and characteristic fragmentation behavior after derivatization or coupling into model peptides. Protected derivatives derived from N- and O-protection strategies can serve as calibration compounds for quantifying incorporation of the thiophene-bearing serine analog in synthesis and for verifying stereochemical outcomes when enantioenriched material is targeted. Structure-activity relationship studies may employ thiophene-containing peptide analogs synthesized from this intermediate to examine how β-heteroaryl substitution and serine hydroxymethyl chemistry influence molecular properties and binding patterns in applied medicinal chemistry research.

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