Ac-L-Trp-OEt contains L-tryptophan with an N-acetyl (Ac) modification and an ethyl ester (OEt) at the carboxyl terminus, classifying it as a derivatized amino acid rather than a free amino acid. The indole side chain of tryptophan remains unmodified and provides aromatic functionality, while the molecule bears an acetylated amino group and an esterified carboxyl group that mask the primary amine and carboxyl functionalities. Ac-L-Trp-OEt is used as a protected, esterified tryptophan building block in peptide and amino acid derivative synthesis, supporting controlled coupling chemistry and serving as a substrate for preparing more complex tryptophan-containing intermediates.
CAT No: CP25648
CAS No:2382-80-1
Chemical Name:N-alpha-Acetyl-L-tryptophane ethyl ester
Ac-L-Trp-OEt is an N-acetylated L-tryptophan ethyl ester designed for use as a protected tryptophan building block in peptide and amide-forming workflows. The indole side chain provides aromatic functionality commonly exploited in peptide structure studies and tryptophan-containing sequence assembly, while the ethyl ester and N-acetyl group help control reactivity during downstream coupling and fragment handling. This form is frequently selected when a tryptophan residue must be introduced with reduced terminal reactivity and predictable behavior in synthetic or analytical intermediate preparation.
1. Peptide Fragment Coupling
Ac-L-Trp-OEt is used as a tryptophan-containing fragment precursor for peptide synthesis and peptide segment assembly, particularly when N-acetylation is desired to match a target peptide's N-terminal context or to simplify chemoselectivity during coupling steps. Researchers preparing tryptophan-bearing peptides for structure-property studies, sequence optimization, or material-scaffold conjugation often choose this ester format to keep the carboxyl functionality masked until the appropriate stage of the workflow. The L-configuration supports consistent stereochemical incorporation into peptide backbones, while the indole side chain remains available for downstream characterization of tryptophan-specific properties in the final peptide.
2. Solution-Phase Amide Intermediates
Ac-L-Trp-OEt is commonly handled in solution-phase synthetic development where controlled conversion to an activated carboxyl equivalent or direct amide formation is required as part of intermediate preparation. Medicinal chemistry and peptide chemistry groups use N-acetylated tryptophan ester derivatives to build amide-linked intermediates that later feed into larger coupling sequences, library synthesis, or fragment elaboration. The combination of N-acetyl protection and ester masking supports a practical balance between stability during handling and reactivity when the next transformation is triggered in the stepwise synthesis plan.
3. Analytical Reference and Calibration
Ac-L-Trp-OEt is also used in analytical method development and reference preparation for workflows that monitor tryptophan-containing species, such as LC-based characterization of peptide intermediates and ester/amide conversion series. Laboratories developing or validating assays for peptide synthesis quality control often benefit from a defined, tryptophan-bearing standard that reflects the indole-containing chemistry encountered in real synthesis streams. The defined N-acetyl and ethyl-ester pattern helps distinguish this intermediate from free tryptophan or other protecting-group variants, supporting more reliable interpretation of chromatographic behavior during process optimization.
4. Pharmaceutical Intermediate Development
Ac-L-Trp-OEt finds use in the preparation of tryptophan-containing pharmaceutical intermediates where a protected amino acid derivative is required to manage reactivity across multi-step sequences. Process development teams and custom synthesis groups select this specific protected form when they need an L-tryptophan unit with a controlled functional group profile that can be carried through fragment assembly and then advanced to the next stage under defined conditions. The indole functionality makes it particularly relevant for building intermediates that will later be incorporated into peptidomimetic scaffolds or tryptophan-containing analogs used for structure-activity and property studies.
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