H-Ala-p-nitrobenzyl ester · HBr

H-Ala-p-nitrobenzyl ester · HBr is an alanine-derived amino acid ester salt in which the amino group is protected as an N-terminal hydrogen chloride salt (HBr counterion) while the carboxyl group is esterified with p-nitrobenzyl alcohol. The molecule contains a stereogenic alanine α-carbon that supports stereochemically defined alanine incorporation, and it bears a p-nitrobenzyl chromophore that can participate in light- or reagent-triggered transformations typical of benzyl ester protecting groups. The presence of the p-nitro substituent increases the electron-withdrawing character of the benzyl moiety, which can modulate ester stability and deprotection behavior under peptide-synthesis-compatible conditions. As a chiral amino acid ester intermediate, H-Ala-p-nitrobenzyl ester · HBr can be used to construct protected alanine building blocks and downstream peptide or amide derivatives while maintaining an ester handle for controlled functional group conversion.

1. Protected Amino Acid Ester

H-Ala-p-nitrobenzyl ester · HBr is applied as a protected alanine amino acid ester for peptide building block preparation and carboxyl activation workflows in synthetic organic chemistry. The alanine backbone provides a defined α-amino functionality under salt form and a stereogenic center, while the p-nitrobenzyl ester masks the carboxyl group for coupling-ready intermediate handling. The benzyl ester strategy supports orthogonal protection logic, enabling selective conversion of the ester to an activated acid derivative or amide under conditions compatible with other protecting groups. Downstream, the compound can serve as a controlled-release or staged-protection intermediate for generating alanine-containing fragments used in peptide coupling chemistry and fine chemical synthesis.

2. Peptide Coupling Chemistry

H-Ala-p-nitrobenzyl ester · HBr is suitable for peptide synthesis development where alanine residues must be introduced with stereochemical fidelity and a protected carboxyl functionality. The N-terminal salt state and the esterified carboxyl provide a defined reactivity profile for sequential transformations, supporting strategies that generate an alanine acylating component or an alanine-containing intermediate for stepwise chain assembly. The p-nitrobenzyl ester can be leveraged as a removable protecting group concept, allowing controlled unmasking of the carboxyl functionality to enable amide bond formation with compatible coupling partners. Resulting alanine-containing peptide fragments and protected intermediates can be used for library synthesis, peptide analog construction, and method development in peptide chemistry.

3. Chiral Building Block Intermediate

H-Ala-p-nitrobenzyl ester · HBr functions as a chiral amino acid intermediate for stereodefined synthesis of alanine derivatives used in molecular design and synthetic route planning. The single chiral center at the alanine α-carbon enables incorporation of a specific stereochemical configuration into downstream amides, peptides, and constrained analogs. The ester form provides a handle for conversion into carboxylic acid derivatives or activated species, while the p-nitrobenzyl group provides a distinct chemical motif that can be tracked by spectroscopic methods during intermediate handling. The compound therefore supports stereoselective fragment construction and downstream derivatization steps that preserve chiral integrity across synthetic sequences.

4. Chromophore-Tagged Intermediate Studies

H-Ala-p-nitrobenzyl ester · HBr can be employed in analytical research and reaction monitoring contexts where the p-nitrobenzyl chromophore aids detection of ester-containing intermediates. The electron-withdrawing p-nitro group on the benzyl moiety supports strong UV-Vis absorbance characteristics, facilitating tracking of protection, esterification, and deprotection events during amino acid derivative synthesis. The alanine ester scaffold maintains a chemically relevant functional motif for coupling or conversion studies while the benzyl chromophore provides a built-in analytical tag. Downstream use includes preparation of labeled or trackable alanine fragments for method development, process troubleshooting, and intermediate characterization in peptide and amino acid chemistry workflows.

5. Process Chemistry Intermediate Preparation

H-Ala-p-nitrobenzyl ester · HBr is relevant to process chemistry and specialty chemical production as an isolable amino acid ester salt intermediate that can feed controlled manufacturing steps for protected alanine derivatives. The salt form with HBr can influence handling behavior and can be integrated into synthetic sequences that require consistent amino functionality management during ester-to-acid or ester-to-activated-acyl transformations. The p-nitrobenzyl ester provides a defined protecting group identity that can be selected to align with downstream coupling schedules and orthogonality requirements in multi-step synthesis. Industrially oriented downstream utility includes manufacturing of protected alanine building blocks, peptide fragment precursors, and fine chemical intermediates used in scalable peptide construction and amino acid derivative supply chains.

1. Immune-awakening Saccharomyces-inspired nanocarrier for oral target delivery to lymph and tumors

2. Exosomes-mediated Transfer of miR-125a/b in Cell-to-cell Communication: A Novel Mechanism of Genetic Exchange in the Intestinal Microenvironment

3. Extended exenatide administration enhances lipid metabolism and exacerbates pancreatic injury in mice on a high fat, high carbohydrate diet

4. Myotropic activity and immunolocalization of selected neuropeptides of the burying beetle Nicrophorus vespilloides (Coleoptera: Silphidae)

5. Novel Peptide-Based PD1 Immunomodulators Demonstrate Efficacy in Infectious Disease Vaccines and Therapeutics