L-4-Nitrophenylglycine is an L-configured, non-proteinogenic amino acid derivative featuring a glycine backbone substituted with a 4-nitrophenyl group on the alpha carbon, placing a nitro-substituted aromatic side chain in place of the typical hydrogen side chain. The molecule contains a free amino group and a free carboxyl group, and the aromatic nitro functionality provides a strongly electron-withdrawing, redox-active handle that can influence peptide-coupling behavior and downstream chemical derivatization. In synthetic peptide chemistry and chemical biology research, it is used as a substituted amino acid building block for preparing peptides and peptide analogues bearing a nitro-aryl motif for structure-activity studies, labeling strategies, and analytical method development.
CAT No: CP10502
L-4-Nitrophenylglycine is an L-amino acid derivative in which the side chain is a para-nitrophenyl substituent attached to a glycine backbone, giving a stereogenic center at the alpha-carbon consistent with the L-configuration. The molecule contains a carboxylic acid and a primary amino group, enabling standard amino acid coupling chemistry while the aromatic nitro substituent introduces strong electron-withdrawing character and distinct spectroscopic handles. The nitro group can participate in selective transformations such as reduction to an aniline or conversion under controlled conditions to other functionalized aromatic motifs, while the aromatic ring supports electrophilic aromatic substitution patterns after appropriate activation. As an amino acid-based intermediate, L-4-nitrophenylglycine can be incorporated into peptide-like constructs or used as a chiral building block for downstream derivatization that preserves the stereochemical information of the L-amino acid.
1. Peptide Coupling Chemistry
L-4-Nitrophenylglycine is applied in peptide synthesis workflows where an amino acid building block with a carboxylic acid and an L-configured amino stereocenter is required for amide bond formation. The glycine-derived backbone supports standard N-protection strategies and C-terminal activation approaches, while the para-nitrophenyl side chain remains chemically addressable without interfering with core coupling steps when protected appropriately. Incorporation into protected amino acid sequences can enable preparation of nitro-bearing peptide fragments for subsequent functional group interconversions, including nitro-to-aniline reduction for generating new binding or labeling motifs. Downstream use commonly includes generation of peptide analogs and peptidomimetic scaffolds that retain stereochemical fidelity from the L-amino acid precursor.
2. Chemical Biology Probes
L-4-Nitrophenylglycine is relevant to chemical biology research as a nitroaromatic amino acid handle that can be transformed into alternative aromatic functionalities for probe construction. The para-nitrophenyl group provides a strong electronic signature for spectroscopic monitoring and can serve as a precursor to anilines or other aromatic derivatives used in labeling chemistries. The amino acid functionality enables conjugation through peptide coupling to biomolecule fragments or to carrier scaffolds, supporting workflows that require stereodefined amino acid incorporation rather than racemic mixtures. Resulting derivatives can be used to generate molecular probes for studying biomolecular recognition, affinity changes upon side-chain modification, and structure-dependent reactivity of aromatic substituents.
3. Chiral Amino Acid Intermediate
L-4-Nitrophenylglycine is utilized as a chiral amino acid intermediate for stereoselective synthesis of functionalized aromatic amino derivatives and related chiral building blocks. The L-configuration at the alpha-carbon provides a defined stereochemical element that can be preserved through protection of the amine and activation or derivatization of the carboxyl group during intermediate preparation. The nitro substituent acts as a transformation point that can be reduced or further functionalized under controlled conditions to access aniline-containing chiral intermediates, which then feed into heteroaromatic or substituted aromatic synthesis. This structure-function combination makes the compound suitable for manufacturing-oriented fine chemical synthesis where stereochemical control and downstream aromatic diversification are needed.
4. Structure-Activity Relationship Studies
L-4-Nitrophenylglycine supports SAR studies in medicinal chemistry and peptidomimetic design by providing a stereodefined amino acid with a modifiable para-nitrophenyl side chain. The aromatic nitro group can be used as a functional handle to generate analog series through systematic side-chain transformations, including nitro reduction to aniline or further derivatization to alter polarity and hydrogen-bonding capacity. The amino acid backbone enables incorporation into peptide-like structures that maintain consistent stereochemical and conformational features across analogs. Resulting nitro-bearing and reduced aromatic variants can be used to map how side-chain electronics and aromatic substitution patterns influence binding interactions in structure-activity relationship workflows.
5. Pharmaceutical Intermediate Preparation
L-4-Nitrophenylglycine is suitable for pharmaceutical intermediate preparation where an L-amino acid-derived aromatic motif is needed for downstream synthesis of substituted aromatic amines and related intermediates. The presence of both an amino group and a carboxylic acid supports conversion into protected amino acid derivatives and activated ester or acid chloride equivalents during process chemistry planning. The nitro functionality enables controlled functional group interconversion that can lead to aniline intermediates, which are common precursors for heterocycle formation, coupling reactions, and further substitution on aromatic rings. Downstream synthetic utility includes producing stereodefined aromatic amino intermediates for fine chemical manufacturing routes that require chiral input and robust functional group management.
6. Analytical Standards And Monitoring
L-4-Nitrophenylglycine is applied in analytical research as a nitroaromatic amino acid standard for method development and impurity profiling in amino acid and peptide-related analyses. The para-nitrophenyl group provides strong UV/visible absorbance characteristics and can generate distinct chromatographic and mass spectrometric signatures compared with non-nitro analogs. The L-amino acid framework also enables targeted derivatization strategies for LC-MS or HPLC workflows that differentiate stereoisomers or monitor protected versus deprotected forms during synthesis. Analytical use extends to supporting quality control of peptide building block preparation and tracking functional group transformations involving nitro-to-aniline conversion pathways.
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