N-1-Fmoc-1,4-diaminobutane · HCl

N-1-Fmoc-1,4-diaminobutane · HCl is an Fmoc-protected primary diamine hydrochloride derived from 1,4-diaminobutane, providing a chiral-free, flexible aliphatic linker with two terminal nitrogen atoms. The molecule contains an Fmoc carbamate on one amino group, while the remaining amino functionality is present as a protonated hydrochloride salt, shaping its solubility and salt-mediated handling during synthesis. The Fmoc group enables standard base-labile protection/deprotection chemistry, whereas the unprotected amine can participate in nucleophilic acylation, alkylation, and coupling reactions. As a protected amino acid-adjacent building block, it functions as a robust chiral-independent spacer for constructing polyamine-containing structures, including peptide side-chain extensions and amine-rich conjugates.

1. Peptide Synthesis

N-1-Fmoc-1,4-diaminobutane · HCl supports solid-phase peptide synthesis and peptide fragment assembly where a diamino linker is required at an internal position or as a side-chain extension. The Fmoc-protected nitrogen provides a coupling handle compatible with Fmoc/tBu peptide strategies, while the second terminal amine can be left available for orthogonal functionalization after incorporation. Fmoc deprotection under standard base conditions can expose the reactive amine for subsequent coupling steps or for controlled attachment of acyl, activated ester, or isocyanate-derived groups. Downstream, the resulting polyamine-containing peptide analogs can be used to probe backbone spacing effects, improve binding interactions through additional cationic sites, and generate amino-linker variants for synthetic library work.

2. Bioconjugation Chemistry

N-1-Fmoc-1,4-diaminobutane · HCl is suitable for bioconjugation workflows that require amine-rich linkers for attaching biomolecules through stable amide or urea linkages. The hydrochloride salt form promotes aqueous compatibility and can help manage protonation state during conjugation planning, while the Fmoc carbamate provides a protected handle for stepwise assembly. After Fmoc removal, the exposed primary amine can react with activated carboxylic acids, NHS-esters, or aldehyde-derived electrophiles to install conjugation points without disturbing the linker backbone. The diamine spacer can also be used to tune linker length and charge density in antibody-payload conjugates, affinity probes, and chemically defined biomolecule labeling reagents.

3. Protected Polyamine Building Blocks

N-1-Fmoc-1,4-diaminobutane · HCl functions as an Fmoc-protected polyamine intermediate for constructing protected amino-linker scaffolds used in multistep fine chemical synthesis. The combination of an Fmoc-protected amine and a second terminal amine enables orthogonal reactivity: Fmoc can be removed to reveal one nucleophile while the remaining amino group can be selectively acylated or further protected depending on the target architecture. Salt-associated protonation of the free amine can be leveraged to control chemoselectivity during derivatization and to improve handling during purification and intermediate isolation. The resulting protected polyamine derivatives can serve as precursors for dendrimer-like linkers, cationic scaffolds, and amine-functional materials precursor chains.

4. Process Chemistry Intermediate

N-1-Fmoc-1,4-diaminobutane · HCl is applicable as a scalable intermediate in process chemistry for producing amine-linker reagents used across peptide manufacturing and specialty chemical production. The Fmoc carbamate is a well-characterized protecting group in industrial peptide supply chains, supporting predictable deprotection logic and compatibility with common coupling chemistries. The hydrochloride salt form can improve storage and weigh-out behavior and can reduce variability associated with free-base amine volatility, supporting consistent downstream conversion to activated derivatives. The diamine functionality enables straightforward transformation into mono- or bis-functional intermediates, supporting manufacturing routes for linker reagents used in polymer modification, surface functionalization, and amine-terminated conjugate synthesis.

5. Amino-Linker Derivatization

N-1-Fmoc-1,4-diaminobutane · HCl can be employed for side-chain functionalization and derivatization strategies that install additional reactive groups onto aliphatic diamine scaffolds. The unprotected terminal amine can undergo acylation to form amides, carbamates, or ureas, while the diamine spacing can position functional groups for multivalent interactions in synthetic constructs. Fmoc protection allows the compound to be introduced into stepwise sequences without premature reaction of the protected nitrogen, enabling controlled introduction of one functional handle at a defined stage. Downstream, functionalized amino-linker derivatives can be used to generate peptidomimetic scaffolds, SAR-focused linker variants, and amine-terminated intermediates for heterobifunctional reagent design in chemical biology and industrial synthesis.

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