N-Fmoc-4-methylbenzyl-glycine combines a para-methyl aromatic group with glycine flexibility, offering hydrophobic modulation. The residue influences packing interactions and side-chain orientation in engineered peptides. Researchers use it to probe aromatic tuning and linker spacing. Its Fmoc protection supports accurate solid-phase incorporation.
CAT No: R2147
CAS No:2137684-15-0
Synonyms/Alias:N-Fmoc-4-methylbenzyl-glycine;2137684-15-0;{[(9H-fluoren-9-ylmethoxy)carbonyl][(4-methylphenyl)methyl]amino}acetic acid;EN300-657848;F80942;2-[9H-fluoren-9-ylmethoxycarbonyl-[(4-methylphenyl)methyl]amino]acetic acid;2-({[(9H-fluoren-9-yl)methoxy]carbonyl}[(4-methylphenyl)methyl]amino)acetic acid;
N-Fmoc-4-methylbenzyl-glycine is a synthetic derivative of glycine featuring an N-terminal fluorenylmethyloxycarbonyl (Fmoc) protecting group and a 4-methylbenzyl substituent. As a structurally modified amino acid, it is primarily utilized in peptide chemistry, where the Fmoc group facilitates solid-phase peptide synthesis (SPPS) through orthogonal protection strategies. The presence of the 4-methylbenzyl moiety provides unique steric and electronic properties that can influence peptide conformation and reactivity, making this compound valuable for the development of specialized peptide analogs. Its tailored design allows researchers to explore structure-activity relationships, introduce site-specific modifications, and enhance the functional diversity of synthetic peptides.
Peptide Synthesis: In peptide research, N-Fmoc-4-methylbenzyl-glycine serves as a protected amino acid building block compatible with standard Fmoc-based SPPS protocols. The Fmoc group enables selective deprotection under mild basic conditions, allowing for sequential chain elongation while minimizing side reactions. The 4-methylbenzyl substituent can be strategically incorporated to modulate the steric environment of the growing peptide chain, aiding in the synthesis of peptides with non-canonical residues or constrained conformations. This utility is particularly relevant for the generation of peptide libraries, peptidomimetics, or sequences that require enhanced stability or bioactivity.
Structure-Activity Relationship Studies: The incorporation of N-Fmoc-4-methylbenzyl-glycine into peptide sequences allows researchers to systematically investigate the impact of side-chain modifications on biological function, receptor binding, or enzymatic recognition. By replacing standard glycine residues with this modified analog, scientists can probe the effects of increased steric bulk and altered hydrophobicity on peptide folding, stability, and interaction profiles. Such studies are critical for the rational design of novel ligands, enzyme substrates, or peptide-based inhibitors with improved selectivity and potency.
Conformational Analysis: The unique structural features of 4-methylbenzyl-glycine make it a valuable probe for examining peptide backbone dynamics and secondary structure preferences. Its introduction into model peptides or constrained motifs can influence local folding patterns, β-turn formation, or helix propensity, providing insights into the determinants of peptide structure. Analytical techniques such as NMR spectroscopy, circular dichroism, and X-ray crystallography can be employed to characterize the conformational consequences of incorporating this residue, advancing the understanding of sequence-structure relationships in synthetic peptides.
Development of Peptidomimetics: The steric and electronic properties conferred by the 4-methylbenzyl side chain support the design of peptidomimetic scaffolds with enhanced resistance to proteolytic degradation or improved pharmacological profiles. By substituting glycine with this protected analog, chemists can generate peptide-like molecules that retain biological activity while exhibiting altered metabolic stability or membrane permeability. Such modifications are instrumental in the creation of research tools, molecular probes, or lead compounds for further optimization in biochemical studies.
Synthesis of Customized Peptide Conjugates: The use of N-Fmoc-4-methylbenzyl-glycine in SPPS enables the preparation of peptides with site-specific modifications suitable for downstream conjugation to fluorophores, affinity tags, or other functional moieties. The tailored side chain can serve as a chemical handle or structural motif, facilitating the development of multifunctional peptides for applications in imaging, affinity purification, or target identification. This versatility supports a broad range of experimental strategies in chemical biology, molecular recognition, and bioanalytical research.
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