Primary Amine Building Blocks & Amino Synthons

Welcome to OUHE Technology’s catalog of primary amine building blocks and amino synthons. We supply high-purity aliphatic primary amines, chiral amine building blocks, and substituted anilines essential for peptide couplings, reductive aminations, and diazonium Sandmeyer reactions. Use our advanced search bar to filter by CAS number or product name to secure your target building blocks.

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Managing Terminal Nucleophilicity and Carbamate Precipitation

The highly nucleophilic terminal primary amine group (-NH2) can readily deactivate transition-metal catalysts or undergo unwanted bis-alkylations during molecular assembly. Additionally, liquid alkylamines easily absorb atmospheric carbon dioxide (CO2) to form white carbamate crusts. At OUHE Technology, we prevent carbamate precipitation and catalyst deactivation by supplying pre-protected or stabilized amine building blocks packaged under dry nitrogen in hermetically sealed containers.

Structural Classes: From Chiral Pool Amines to Diazonium Precursors

  • Chiral Primary Amines: Enantiomerically pure building blocks (including amino acid derivatives) optimized for asymmetric organocatalysis and stereoselective API design.

  • Aromatic Anilines (Arylamines): Essential precursors for diazotization and Sandmeyer reactions to introduce halogens, nitriles, or hydroxyl groups onto benzene rings.

  • Pre-Protected Amine Synthons: Reagents pre-configured with Boc, Cbz, or phthaloyl groups to selectively mask nucleophilicity, ensuring orthogonal reactivity during complex couplings.

Amine Titer Determination and High-Resolution Spectroscopic Quality Control

Because primary amines can degrade via oxidation or reaction with ambient carbon dioxide, verifying active amine titer is a major quality concern. We utilize high-resolution capillary GC-FID or HPLC with base-deactivated columns to prevent peak tailing and accurately measure purity. Every batch is verified using high-field NMR and Mass Spectrometry (MS) through our academic partnerships to confirm structural and stereochemical purity.

Frequently Asked Questions

A: The highly nucleophilic terminal −NH2 group (pKa ~9-11) is prone to unwanted bis-alkylations and can poison transition-metal catalysts by coordinating to the metal center. Using pre-protected amine building blocks ensures orthogonal, selective chemistry during multi-step organic synthesis.

A: Our high-purity aniline intermediates undergo smooth reaction with nitrous acid to yield highly reactive diazonium salts. These intermediates can be cleanly converted into iodides, bromides, chlorides, nitriles, or phenols under mild conditions, allowing for highly flexible ring functionalization.

A: We resolve and measure enantiomeric purity (enantiomeric excess, % ee) of chiral amines using high-resolution chiral HPLC with polysaccharide-based columns. Absolute structural and stereochemical configurations are confirmed via detailed 1H-NMR, 13C-NMR, and MS spectra.