Boc-L-glutamic acid α-benzyl ester is a protected, naturally derived amino acid derivative featuring the L-glutamate backbone with a Boc-protected α-amino group and an α-benzyl ester at the carboxyl terminus. The molecule contains a side-chain γ-carboxylic acid characteristic of glutamic acid, while the Boc group and benzyl ester mask the amino and carboxyl functionalities to control chemoselectivity during stepwise assembly. In peptide chemistry, it is employed as a protected glutamate building block for introducing the glutamate side-chain into peptide chains under conditions that allow selective deprotection or activation of the remaining functional group.
CAT No: CP00708
CAS No:30924-93-7
Synonyms/Alias:Boc-Glu-OBzl;30924-93-7;Boc-L-glutamicacid1-benzylester;1-BenzylN-Boc-L-glutamate;Boc-L-glutamicacid|A-benzylester;SBB063733;(4S)-5-(benzyloxy)-4-[(tert-butoxycarbonyl)amino]-5-oxopentanoicacid;B-Glu-BE;Nalpha-Boc-Glu-OBn;AC1L4AWX;KSC911I3D;tert-Butyloxycarbonyl-glutamicacid1-benzylester;B9003_SIGMA;SCHEMBL957159;15107_FLUKA;CTK8B1431;CVZUKWBYQQYBTF-ZDUSSCGKSA-N;MolPort-003-926-648;ACT06563;Boc-L-glutamicacida-benzylester;EBD48044;ZINC2539202;ANW-26999;CB-210;Nalpha-Boc-glutamicacidbenzylester
Boc-L-glutamic acid α-benzyl ester is a protected glutamate building block featuring an N-terminal Boc carbamate and a side-chain carboxyl protected as a benzyl ester, providing orthogonal protection for downstream peptide assembly. This protected amino acid is routinely used to control chemoselectivity during peptide synthesis, enabling selective deprotection and coupling strategies that preserve glutamate functionality until the desired stage of synthesis. Its stereochemistry and protected side-chain carboxyl make it a practical intermediate for preparing glutamate-containing peptide segments and related pharmaceutical intermediates.
1. Solid-Phase Peptide Synthesis
Boc-L-glutamic acid α-benzyl ester is used by peptide synthesis groups to incorporate glutamate residues into peptide sequences while maintaining protection of both the amino functionality (Boc) and the glutamate side-chain carboxyl (benzyl ester). In solid-phase peptide synthesis workflows, the benzyl ester side-chain protection helps minimize side reactions during chain elongation, while the Boc group supports controlled activation and coupling steps consistent with protected-amino-acid segment construction. This format is particularly valued when glutamate side-chain integrity must be preserved during multiple coupling and deprotection cycles, such as in the preparation of peptide libraries and sequence-specific peptide targets.
2. Glutamate Side-Chain Functional Intermediates
Boc-L-glutamic acid α-benzyl ester serves as a key intermediate for generating glutamate-containing building blocks in which the side-chain carboxyl is temporarily masked as a benzyl ester to enable selective downstream transformations. Custom peptide manufacturing and medicinal chemistry teams commonly use this protection pattern to prepare glutamate derivatives for segment condensation, fragment coupling, or further derivatization at the side-chain carboxyl at a later stage. By deferring side-chain exposure until the appropriate step, the reagent supports cleaner assembly of complex peptide architectures where glutamate reactivity would otherwise interfere with peptide bond formation or other functional group manipulations.
3. Pharmaceutical Peptide Intermediate Development
Boc-L-glutamic acid α-benzyl ester is frequently selected in pharmaceutical intermediate development for the stepwise construction of glutamate-containing peptide intermediates used in lead optimization and process development. Chemical development groups rely on the dual protection strategy to manage reactivity during scale-up synthesis, where controlling chemoselectivity and minimizing side products are critical for reproducible intermediate quality. This protected glutamate format aligns with workflows that require staged deprotection and controlled access to the glutamate side-chain carboxyl functionality, supporting the preparation of defined peptide fragments for subsequent coupling into larger drug-relevant sequences.
4. Peptide Library Construction
Boc-L-glutamic acid α-benzyl ester is used in peptide library construction to enable systematic variation of glutamate-containing motifs while keeping the side-chain carboxyl protected throughout the synthesis campaign. Researchers building arrays of related peptides benefit from the stability of the benzyl ester under typical peptide synthesis conditions, which helps maintain consistent side-chain protection across multiple analogs. The Boc/benzyl protection pattern supports efficient handling of glutamate residues during parallel synthesis and subsequent processing steps, making the reagent a practical choice for generating glutamate-rich peptide sets for structure-activity relationship studies and biochemical assay development.
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