(R)-α-Methyl-4-iodophenylalanine is a non-proteinogenic, aromatic amino acid derivative featuring a phenylalanine-type side chain substituted with iodine at the 4-position and an α-methyl substituent that introduces steric bulk at the α-carbon. The molecule contains an amino group and a carboxyl group, with the (R) stereochemical configuration specified at the α-carbon, and the side chain bears a hydrophobic aromatic ring with a halogen (iodine) that can serve as a chemically stable handle for labeling or crosslinking strategies. In synthetic and chemical biology workflows, it is used as a substituted amino acid building block for preparing modified peptides and for structure-activity or labeling studies where an iodinated, sterically constrained aromatic residue is required.
(R)-α-Methyl-4-iodophenylalanine is a chiral, non-proteinogenic amino acid building block featuring an α-methyl substituent and a 4-iodophenyl side chain. The combination of stereochemical rigidity and an aryl iodide makes it a practical scaffold for medicinal chemistry and peptide/peptidomimetic development, where iodine can support downstream functionalization and radiolabeling strategies. Researchers also use this compound to introduce a defined stereocenter and aromatic handle into synthetic sequences for structure-activity relationship studies and chemical biology workflows.
1. Peptidomimetic Building Blocks
(R)-α-Methyl-4-iodophenylalanine is used as a stereodefined amino acid building block for the synthesis of modified peptides and peptidomimetics, particularly when enhanced conformational control is desired through the α-methyl substitution. Medicinal chemistry groups incorporate this residue into analog series to probe how backbone substitution and side-chain electronics influence binding and selectivity trends in structure-activity relationship campaigns. The 4-iodophenyl side chain provides a convenient aromatic "handle" that can be retained for specific physicochemical effects or used as a point of diversification in later stages of analog development. Custom peptide synthesis workflows and research-scale library construction commonly rely on this type of non-natural amino acid to generate well-defined analogs with consistent stereochemistry.
2. Medicinal Chemistry Diversification
(R)-α-Methyl-4-iodophenylalanine is widely applied in medicinal chemistry as a functionalized amino acid intermediate for analog diversification, where the aryl iodide enables targeted downstream transformations to access substituted phenyl variants. Small-molecule and peptide-drug discovery teams use it to rapidly generate chemical diversity while maintaining the same chiral α-methyl stereocenter across analog sets. This approach supports iterative optimization of structure-activity relationships, especially in programs that evaluate how aromatic substitution patterns and steric effects impact target engagement. Pharmaceutical intermediate development teams also value the defined stereochemical identity of this building block for reproducible manufacturing of research quantities of iodinated intermediates and related analogs.
3. Radiolabeling And Imaging Precursors
(R)-α-Methyl-4-iodophenylalanine serves as a key iodinated scaffold for workflows that require incorporation of iodine into labeled analogs for tracer development. Chemical biology and imaging-reagent teams use iodinated amino acid derivatives as precursors to prepare radioiodinated or iodine-containing probes for binding studies and biodistribution experiments in preclinical research settings. The presence of an aryl iodide on a chiral amino acid framework helps maintain structural fidelity between the labeled tracer and the corresponding non-labeled reference compound used for comparison. This makes the building block useful when the labeling position must be controlled and when the labeled probe is intended to preserve the stereochemical features of the parent scaffold.
4. Analytical Reference Standards
(R)-α-Methyl-4-iodophenylalanine is employed as an analytical reference material in method development and characterization of iodinated amino acid derivatives and peptide/peptidomimetic intermediates. Analytical laboratories use the compound to confirm identity and retention behavior in LC methods, to support impurity profiling, and to calibrate workflows that quantify iodinated synthetic intermediates during development. Its defined chirality and iodinated aromatic side chain make it a practical standard for tracking stereochemically consistent material across synthesis and purification sequences. This use is especially common in research settings where iodinated compounds are handled and monitored as key intermediates for downstream functionalization.
4. TMEM16F and dynamins control expansive plasma membrane reservoirs
5. Autoinhibition and phosphorylation-induced activation of phospholipase C-γ isozymes
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