H-1,4-cis-ACHC-OMe*HCl

H-1,4-cis-ACHC-OMe*HCl is a chiral amino acid methyl ester hydrochloride derived from an ACHC-type scaffold bearing a defined 1,4-cis relationship across the ring-forming carbon framework. The molecule contains a protected salt-form carboxylate equivalent (methyl ester) and a protonated amine (HCl), which together govern solubility and control of amine reactivity during synthesis. Stereochemical fixation at the chiral centers supports reproducible incorporation into peptide and peptidomimetic sequences, while the ester functionality enables downstream hydrolysis, transesterification, or conversion to activated carboxyl derivatives for coupling. The hydrochloride salt form also supports handling as a stable chiral intermediate for protected amino acid chemistry and for constructing stereodefined amide linkages under standard peptide synthesis conditions.

1. Protected Amino Acid Synthesis

H-1,4-cis-ACHC-OMe*HCl is used in protected amino acid synthesis workflows where salt-form amine handling and ester compatibility are required for controlled derivatization. The protonated amine can be selectively managed through base-mediated neutralization and subsequent N-protection strategies, enabling conversion into an N-protected amino acid derivative suitable for peptide coupling. The methyl ester can be retained during early steps to maintain chemoselectivity, then later transformed into an acid or activated ester for amide bond formation. The defined 1,4-cis stereochemistry supports stereospecific building-block preparation for stereodefined peptide fragments and chiral intermediate supply chains in fine chemical synthesis.

2. Peptide Coupling Chemistry

H-1,4-cis-ACHC-OMe*HCl serves as a stereodefined peptide building block precursor for constructing amide linkages in peptide synthesis and peptidomimetic assembly. The amino functionality, when converted from the HCl salt into an appropriate coupling-ready form, participates in standard peptide coupling chemistry to install the ACHC residue at either internal or terminal positions. The methyl ester provides a protected carboxyl handle that can be carried through coupling sequences and then converted to the corresponding carboxylic acid for C-terminal modification or for generating activated intermediates. The rigid 1,4-cis configuration can influence local backbone conformation in the resulting peptides, supporting structure-activity relationship studies that depend on stereochemical fidelity.

3. Peptidomimetics And SAR Studies

H-1,4-cis-ACHC-OMe*HCl is applied in peptidomimetic construction and SAR-focused molecular design where stereochemically constrained amino acid motifs are used to probe binding-site recognition. The chiral amino acid ester format enables rapid generation of libraries of analogs by converting the ester into amide-forming derivatives and by varying N-protection and subsequent side-chain or terminal functional group transformations. The hydrochloride salt form can simplify intermediate handling for parallel synthesis, while the fixed cis stereochemistry helps maintain consistent spatial presentation of functional groups across analog sets. Downstream conversion to carboxylic acid or activated carboxyl derivatives supports iterative scaffold elaboration used in medicinal chemistry research and in applied combinatorial chemistry campaigns.

4. Chiral Intermediate For Manufacturing

H-1,4-cis-ACHC-OMe*HCl is suitable for process chemistry intermediate preparation where chiral building blocks must be handled reproducibly at scale. The methyl ester and HCl salt combination provides a practical protected/controlled reactivity profile that can be aligned with manufacturing routes involving selective deprotonation, N-protection installation, and ester-to-acid conversion steps. The stereochemical integrity of the 1,4-cis amino acid framework supports downstream formation of stereodefined peptide intermediates used in pharmaceutical intermediate supply chains and specialty chemical production. The compound's structure enables integration into controlled, stepwise synthetic sequences that generate coupling-ready amino acid derivatives for bulk or batch manufacture of peptide-like materials.

5. Analytical Standards And Method Development

H-1,4-cis-ACHC-OMe*HCl can be employed as a chiral reference material for analytical research and method development related to amino acid derivative characterization. The presence of a defined stereochemical pattern and the ester hydrochloride form allows chromatographic and spectrometric methods to distinguish stereoisomeric or epimeric impurities arising during protected amino acid synthesis. Ester hydrolysis and derivative formation can be used to generate defined analytical targets for verifying conversion completeness and for monitoring ester/acid interconversions in peptide building-block workflows. The compound therefore supports quality control and characterization strategies used in biochemical research intermediate qualification, peptide synthesis development, and industrial chemical manufacturing analytics.

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