H-Lys-OBzl · 2 p-tosylate

H-Lys-OBzl · 2 p-tosylate is a protected lysine derivative in which the α-amino group is protected as an N-α-benzyloxycarbonyl (Cbz) carbamate, the α-carboxyl is masked as a benzyl ester (OBzl), and the ε-amino side chain is present as a tosylate salt complexed with two p-toluenesulfonate counterions. The molecule therefore contains a chiral lysine backbone with stereogenicity at the α-carbon, a benzylic ester linkage that can be selectively removed under hydrogenolysis conditions, and sulfonamide-forming tosylate protection that modulates nucleophilicity and directs chemoselective peptide coupling. The presence of both Cbz and tosyl-protected amine functionalities provides a staged deprotection profile, while the benzylic ester and aromatic sulfonate groups contribute to crystallinity and handling characteristics typical of protected amino acid intermediates. The combined protecting-group set supports controlled conversion into mono- or di-functional lysine building blocks for peptide synthesis, side-chain derivatization, and downstream chiral intermediate preparation.

1. Protected Amino Acid Synthesis

H-Lys-OBzl · 2 p-tosylate is applied in protected amino acid synthesis and intermediate preparation for lysine-based building blocks used in peptide building workflows. The Cbz-protected α-amino group and benzyl ester at the α-carboxyl provide orthogonal protection relative to the ε-amino tosylate, enabling stepwise deprotection and re-protection strategies that control which nitrogen participates in coupling at each stage. The tosylated ε-amino functionality can be maintained during early coupling steps, while the benzyl ester and Cbz group can be removed to expose reactive sites for subsequent functionalization. The resulting lysine-derived intermediates can be routed into protected amino acid chemistry for fine chemical synthesis and process-oriented manufacture of peptide-grade materials.

2. Peptide Synthesis

H-Lys-OBzl · 2 p-tosylate is suitable for peptide synthesis where lysine incorporation with controlled side-chain reactivity is required. The protected α-amino carbamate and benzyl ester allow chemoselective peptide coupling at the α-position after activation of the carboxyl derivative, while the ε-amino tosylate suppresses undesired side reactions such as branching or crosslinking during chain assembly. The orthogonal protecting-group pattern supports selective deprotection to generate a free ε-amine for later conjugation, cyclization, or salt-formation steps in the peptide assembly sequence. Lysine-containing peptide fragments prepared from this protected amino acid can serve as intermediates for sequence-defined peptides, peptidomimetics, and research-grade protein/peptide analog scaffolds.

3. Side-Chain Functionalization

H-Lys-OBzl · 2 p-tosylate is used for side-chain functionalization workflows targeting lysine ε-amino chemistry in chemical biology and synthetic organic chemistry. The ε-amino tosylate acts as a stable protecting group that can be removed selectively to reveal a nucleophilic primary amine for subsequent derivatization such as acylation, sulfonamide formation, or attachment of linkers for conjugation chemistry. The benzylic ester and Cbz group provide additional handle points for staged transformations, allowing the lysine side chain to be modified without prematurely exposing the α-carboxyl or α-amino functionality. Functionalized lysine derivatives generated from this intermediate can be applied to molecular scaffold diversification, peptidomimetic construction, and downstream preparation of conjugatable biomolecule fragments.

4. Bioconjugation Chemistry

H-Lys-OBzl · 2 p-tosylate is applied in bioconjugation chemistry where lysine-based attachment points are engineered with controlled protection for reproducible coupling. The tosyl-protected ε-amino group can be held inert during intermediate purification and handling, then converted to a free ε-amine at the appropriate stage to enable conjugation to activated esters, isothiocyanates, aldehydes, or other electrophiles used in linker installation. The protected α-functionality helps maintain structural integrity during the synthesis of conjugation-ready peptide or peptidomimetic precursors, supporting consistent stoichiometry in downstream coupling steps. Lysine-containing conjugation intermediates derived from this compound can be used to generate labeled biomolecule constructs and analytical standards that rely on defined amine positioning.

5. Pharmaceutical Manufacturing Intermediates

H-Lys-OBzl · 2 p-tosylate serves as a lysine-protected intermediate for pharmaceutical manufacturing routes that require controlled protection of both α- and ε-amino functionalities during peptide or peptide-like intermediate production. The Cbz carbamate and benzyl ester protect the α-amino and α-carboxyl groups to support robust coupling chemistry, while the ε-amino tosylate provides resistance to side reactions under conditions commonly used for peptide assembly and purification. The staged deprotection profile aligns with process chemistry needs for predictable conversion to lysine-containing intermediates and for minimizing uncontrolled crosslinking from free amines. Downstream use can include preparation of defined peptide building blocks, process intermediates for active pharmaceutical ingredient (API) synthesis, and manufacturing feedstocks for specialty chemical production workflows involving amino acid derivatives.

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