Boc-p-carboxy-Phe(OtBu)-OH · DCHA

Boc-p-carboxy-Phe(OtBu)-OH · DCHA is a Boc-protected, side-chain protected phenylalanine derivative bearing an additional p-carboxyl substituent on the aromatic ring. The presence of the Boc group and the OtBu side-chain protection makes it a stable building block for controlled peptide assembly, while the extra carboxyl functionality enables downstream incorporation of polar, acidic character into peptide sequences. The DCHA counterion is used to improve handling and solid-state properties for laboratory and manufacturing workflows where protected amino acid reagents are dosed and stored as defined salts.

1. Solid-Phase Peptide Synthesis

Boc-p-carboxy-Phe(OtBu)-OH · DCHA is used as a protected amino acid building block for solid-phase peptide synthesis when an aromatic side chain with an extra para-carboxyl group is required. Peptide chemists select this reagent to introduce an acidic, highly polar functionality into peptide backbones for sequence-specific studies, including structure-property investigations of charge distribution and local electrostatics. The Boc protection supports standard peptide coupling workflows on resin-bound intermediates, while the OtBu side-chain protection helps maintain side-chain integrity during repetitive deprotection/coupling cycles. The DCHA salt form is commonly chosen to support consistent reagent weighing, dissolution behavior, and reliable performance in automated or semi-automated peptide synthesis platforms.

2. Peptide Library And Analog Design

Boc-p-carboxy-Phe(OtBu)-OH · DCHA is frequently incorporated into peptide library construction where systematic variation of acidic aromatic residues is used to probe binding modes, conformational preferences, or solubility/aggregation tendencies in peptide analogs. Medicinal chemistry and chemical biology teams use such non-standard aromatic amino acid residues to tune physicochemical properties without changing the overall peptide scaffold, enabling SAR-style comparisons across closely related sequences. The protected nature of the amino acid minimizes undesired side reactions during parallel synthesis, while the additional carboxyl group provides a handle for later functionalization or for maintaining a defined negative charge motif in the final peptide. This makes the reagent particularly useful for generating focused sets of peptide analogs for downstream screening and characterization workflows.

3. Pharmaceutical Intermediate For Acidic Residue Incorporation

Boc-p-carboxy-Phe(OtBu)-OH · DCHA serves as a pharmaceutical intermediate building block for preparing protected peptide fragments and advanced intermediates that contain an aromatic para-carboxyl functionality. Process development chemists and custom synthesis groups use this reagent to assemble segments where the extra carboxyl group must remain protected until late-stage transformations, supporting controlled manufacturing of complex, polar peptide-containing intermediates. The Boc and OtBu protections allow selective handling across multi-step assembly routes, while the DCHA salt form helps standardize reagent logistics for scale-up and batch-to-batch consistency in intermediate production. In downstream workflows, the resulting protected fragments can be carried into final deprotection and coupling steps to deliver peptide targets or peptide-based research materials with defined acidic residue content.

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