Boc-D-Glu-OtBu is a protected amino acid derivative of D-glutamic acid in which the α-amino group is carbamylated with a Boc (tert-butoxycarbonyl) protecting group and the α-carboxyl group is esterified as an OtBu (tert-butyl ester). The side chain retains the glutamate γ-carboxyl functionality, while the Boc and OtBu groups mask the primary amino and carboxyl functionalities to control chemoselectivity during stepwise peptide assembly. In synthesis, this protected analogue is used as a building block for incorporating D-glutamate residues into peptides and amino acid derivatives, and its protected functional groups support controlled coupling and subsequent deprotection strategies in peptide chemistry workflows.
CAT No: CP27413
CAS No:73872-71-6
Synonyms/Alias:Boc-D-Glu-OtBu;73872-71-6;(R)-5-(tert-Butoxy)-4-((tert-butoxycarbonyl)amino)-5-oxopentanoicacid;SCHEMBL3773280;MolPort-020-004-770;ZINC2554999;KM1576;MFCD00076926;CS11059;AJ-39664;AK-50079;ST2402662;FT-0688453;V7556;I04-1250;Q-101544
Boc-D-Glu-OtBu is a protected D-glutamic acid building block featuring a Boc-protected alpha-amino group and an OtBu-protected side-chain carboxyl group, providing orthogonality and controlled reactivity during peptide assembly. This glutamate derivative is widely used in peptide chemistry where the D-configuration and dual carboxyl protection help manage stereochemical outcomes and minimize side reactions during coupling and subsequent deprotection steps. Its protected format makes it a practical intermediate for preparing D-Glu-containing peptides and related pharmaceutical-grade segments.
1. D-Glu Peptide Building Blocks
Boc-D-Glu-OtBu is routinely selected for custom peptide synthesis workflows that require incorporation of D-glutamate residues while maintaining side-chain carboxyl protection throughout chain assembly. Peptide chemists use this protected amino acid to prepare D-Glu-containing peptide segments for structure-activity relationship studies, peptide backbone stereochemistry investigations, and stability-focused analog libraries. The Boc group supports standard peptide coupling strategies under protected-amino-acid conditions, while the OtBu side-chain protection helps prevent unwanted side-chain reactions and supports clean downstream deprotection and segment condensation.
2. Stereodefined Peptide Analog Synthesis
Boc-D-Glu-OtBu enables stereodefined construction of peptide analogs where D-amino acid content is used to control conformational preferences and proteolytic stability in chemical biology and medicinal chemistry research programs. In practice, researchers developing D-amino-acid-rich peptides for mechanistic studies or lead optimization rely on this reagent to introduce the D-configuration at the glutamate position with minimal ambiguity in stereochemical incorporation. The protected side-chain carboxyl functionality is particularly useful when subsequent steps require selective unmasking to generate defined charge states, enabling consistent comparison across peptide variants.
3. Pharmaceutical Intermediate Segment Development
Boc-D-Glu-OtBu is also used as a protected glutamate intermediate for manufacturing-oriented synthesis of peptide-based pharmaceutical intermediates and advanced building blocks. Process chemists and contract peptide manufacturers incorporate this reagent into protected peptide segments that later undergo coupling, purification, and controlled deprotection to deliver defined D-Glu-containing intermediates for further elaboration. The dual protection pattern (Boc on the amino terminus and OtBu on the side-chain carboxyl) supports robust handling during multi-step assembly, helping maintain functional-group integrity until the target deprotection stage in the downstream workflow.
4. Orthogonally Protected Carboxyl Handling
Boc-D-Glu-OtBu supports workflows that require careful management of carboxylic acid reactivity during iterative peptide construction, especially when multiple acidic functionalities must be kept protected until specific stages. Researchers preparing complex peptide sequences often choose this reagent because the OtBu side-chain protection allows the glutamate side chain to remain masked during earlier coupling steps, reducing risks of side reactions associated with free carboxyl groups. After assembly, the protected side chain can be unmasked in a controlled manner to generate a defined glutamate functionality for subsequent conjugation, further derivatization, or final peptide isolation steps.
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