Fmoc-octyl-D-Gly-OH

Fmoc-octyl-D-Gly-OH is an Fmoc-protected, D-configured glycine derivative bearing an octyl side-chain substituent on the amino acid backbone, forming a chiral amino acid building block with a protected α-amino group and a free carboxylic acid for downstream peptide chemistry. The molecule combines an aromatic fluorenylmethoxycarbonyl (Fmoc) protecting group with a hydrophobic C8 chain, which increases nonpolar character and can influence aggregation behavior during solid-phase or solution-phase assembly. The stereochemical designation at the glycine center (D-configuration) supports enantioselective incorporation into peptide sequences and stereochemically defined peptidomimetics. The presence of both Fmoc and a carboxylic acid enables controlled deprotection and coupling while the octyl substituent can undergo further functional-group transformation or serve as a hydrophobic handle for structure modulation.

1. Peptide Synthesis

Fmoc-octyl-D-Gly-OH supports peptide building block preparation for solid-phase peptide synthesis and solution-phase peptide coupling workflows where an Fmoc-protected amino acid is required. The Fmoc carbamate masks the α-amino functionality for iterative coupling, while the free carboxylic acid participates in amide bond formation under standard peptide coupling conditions. The D-configuration enables incorporation of stereodefined glycine analogs into peptide chains, which can be used to probe backbone stereochemistry effects on folding and stability. The octyl side chain provides a hydrophobic segment that can be used to tune solubility, membrane affinity, and aggregation propensity of peptide constructs, supporting downstream synthesis of hydrophobic peptide analogs.

2. Peptidomimetics And SAR

Fmoc-octyl-D-Gly-OH serves as a chiral component in peptidomimetic construction and structure-activity relationship studies where side-chain hydrophobicity and stereochemical placement are key variables. The Fmoc-protected amino acid form allows controlled incorporation into scaffold sequences, while the octyl substituent functions as a tunable lipophilic element that can modulate conformational preferences and target binding interactions in a SAR context. The D-configuration at the glycine derivative can be used to generate stereochemical variants for mapping how inversion at the amino acid center affects biological recognition or stability of peptide-like molecules. The resulting peptide analogs can be further elaborated into libraries of hydrophobic fragments and analog series for medicinal chemistry optimization.

3. Chemical Biology Conjugation

Fmoc-octyl-D-Gly-OH can be applied in chemical biology workflows that require hydrophobic amino acid handles for conjugation and biomolecular labeling strategies. The carboxylic acid enables conversion into activated intermediates for amide or ester linkage formation, while the octyl side chain supports membrane-associated labeling, affinity capture, or hydrophobic anchoring in conjugates. The Fmoc group enables orthogonal protection logic during multi-step synthesis, allowing selective deprotection when assembling conjugation-ready peptide fragments. Stereodefined D-amino acid incorporation can also be used to control resistance to proteolysis in labeled constructs, supporting generation of stable peptide-based probes for biochemical investigations.

4. Drug Discovery Scaffolds

Fmoc-octyl-D-Gly-OH is suitable for fragment-based molecular design and drug discovery chemistry where peptide-like fragments with defined stereochemistry and hydrophobic surface area are assembled. The Fmoc-protected amino acid format supports stepwise construction of short oligomers or constrained peptidomimetic segments, and the octyl substituent contributes a controllable lipophilic region that can be mapped against binding requirements. The free carboxylic acid facilitates downstream derivatization into coupling partners, enabling integration into larger medicinal chemistry intermediates. D-configured incorporation supports stereochemical diversification of lead series, enabling systematic exploration of how chiral amino acid placement and hydrophobic chain length affect molecular recognition.

5. Pharmaceutical Manufacturing Intermediates

Fmoc-octyl-D-Gly-OH can be used as a defined, protected amino acid intermediate in manufacturing-oriented synthesis of peptide intermediates and hydrophobic peptide building blocks. The Fmoc protecting group supports reproducible deprotection and coupling cycles, while the presence of a single free carboxylic acid provides a clear functional handle for conversion into activated forms during process chemistry. The octyl side chain can be leveraged to prepare hydrophobic peptide segments used in formulation-relevant materials or investigational peptide constructs that require controlled nonpolar character. The stereochemically specified D-amino acid nature supports consistent intermediate identity across scale-up batches, aligning with industrial needs for stereodefined peptide component preparation.

6. Analytical Research Standards

Fmoc-octyl-D-Gly-OH can be employed in analytical research for method development and reference standard preparation involving Fmoc-amino acid derivatives and peptide-like analytes. The combination of Fmoc chromophore and a hydrophobic octyl substituent yields strong detectability in chromatographic and spectrometric workflows, supporting tracking of protected amino acid intermediates and peptide coupling outcomes. The carboxylic acid and protected amine enable generation of defined derivatives for calibration, impurity profiling, and stereochemical comparison of glycine analogs. D-configured stereochemistry can be used to build stereospecific reference sets that support accurate identification of enantiomeric or diastereomeric peptide fragments in biochemical and synthetic chemistry quality control.

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