(S)-(+)-2-Amino-1-butanol: Handling & Lab Protocol Guide

(S)-(+)-2-Amino-1-butanol is a water-miscible chiral amino alcohol widely used as an enantiomerically pure building block in asymmetric synthesis and pharmaceutical intermediate preparation.

Chemical Name

(S)-(+)-2-Amino-1-butanol

SKU

A107264

Water Miscibility

Miscible with water

Stereocentre Configuration

S-configuration, (+) optical rotation

Functional Groups

Primary alcohol and primary amine

Typical Application

Chiral auxiliary, pharmaceutical intermediate, asymmetric synthesis

Overview and Chemical Properties

(S)-(+)-2-Amino-1-butanol (SKU: A107264) is an enantiomerically enriched bifunctional compound bearing both a primary hydroxyl group and a primary amine on adjacent carbons, with the stereocentre held in the S-configuration. The compound is a colourless to pale-yellow viscous liquid that is fully miscible with water, making it easy to formulate into aqueous reaction media or biological buffers. Its bifunctional nature—combining nucleophilic amine and alcohol moieties—makes it a versatile chiral building block for the preparation of oxazolines, amino acid derivatives, and other heterocyclic scaffolds frequently encountered in medicinal chemistry.

The compound carries a positive optical rotation, consistent with the S-absolute configuration. Researchers should verify optical purity (ee%) by chiral HPLC or polarimetry before use in stereoselective transformations to ensure that downstream enantioselectivity is not compromised by racemisation during storage.

Storage and Stability

Store (S)-(+)-2-Amino-1-butanol under the following recommended conditions to maintain optical and chemical integrity:

• Temperature: Store at 2–8 °C in a refrigerator, tightly sealed. For long-term archival, storage at −20 °C is advisable to minimise slow racemisation or oxidative degradation.
• Container: Keep in the original amber glass bottle or a compatible inert container. Avoid prolonged contact with reactive metals or strong oxidisers.
• Atmosphere: Seal under an inert atmosphere (nitrogen or argon) after each use to prevent moisture ingress and amine oxidation.
• Light: Protect from prolonged exposure to direct light.

Verify optical purity periodically if the compound has been stored for an extended period or after temperature excursions. Discard any lot showing visible discolouration or precipitation.

Solution Preparation Protocol

Because (S)-(+)-2-Amino-1-butanol is miscible with water, stock solution preparation is straightforward. Follow these steps:

1. Equilibrate to room temperature: Allow the sealed vial to reach ambient temperature before opening to avoid condensation contaminating the bulk reagent.
2. Select solvent: For aqueous applications, dissolve directly in deionised water, phosphate buffer, or aqueous organic co-solvent systems (e.g., water/ethanol). For organic synthesis, common solvents include anhydrous dichloromethane, tetrahydrofuran, or acetonitrile.
3. Weigh accurately: Tare a pre-dried, inert container and transfer the desired mass of liquid reagent using a positive-displacement pipette or a calibrated syringe to minimise volumetric error from the viscous liquid.
4. Dissolve and mix: Add solvent incrementally with gentle stirring or vortexing until a homogeneous solution is obtained. The compound dissolves readily in water at all practical concentrations.
5. Filter if required: Pass the solution through a 0.22 µm syringe filter for biological or HPLC applications.
6. Label and store: Label with compound name, concentration, date, and operator. Store solutions at 2–8 °C and use within a validated stability window.

Note: Avoid strong acids or bases during formulation unless the protocol specifically requires salt formation, as pH extremes may promote racemisation.

Safety and Handling Precautions

Always consult the current Safety Data Sheet (SDS) provided by Aladdin Scientific before handling (S)-(+)-2-Amino-1-butanol. General precautions for amino alcohol reagents include:

• Personal Protective Equipment (PPE): Wear chemical-resistant gloves (nitrile or neoprene), safety goggles, and a lab coat. Work in a fume hood when handling bulk quantities.
• Skin and eye contact: The compound is a primary amine and may cause skin sensitisation or irritation. In case of skin contact, wash thoroughly with soap and water. For eye contact, flush immediately with copious water and seek medical attention.
• Inhalation: Amine vapours can be irritating to the respiratory tract. Ensure adequate ventilation; use a fume hood for open handling.
• Incompatibilities: Keep away from strong acids, strong oxidisers, and acyl halides, which react vigorously with the amine and alcohol groups.
• Waste disposal: Dispose of residues in accordance with local institutional and governmental regulations for amine-containing chemical waste.

Quality Control and Verification

To confirm the identity and purity of (S)-(+)-2-Amino-1-butanol (A107264) prior to critical experiments, the following QC checks are recommended:

• Optical rotation: Measure [α]D at 20 °C in an appropriate solvent (e.g., water or ethanol) and compare with the certificate of analysis (CoA) value. A positive rotation confirms the S-enantiomer is predominant.
• Chiral HPLC: Use a validated chiral stationary phase column to determine enantiomeric excess (ee%). Reject any batch with ee% below the specification on the CoA.
• NMR: ¹H and ¹³C NMR spectra in D₂O or CDCl₃ should match reference spectra for (S)-(+)-2-amino-1-butanol.
• GC purity: Gas chromatography can confirm chemical purity and detect volatile impurities.
• Water content: Karl Fischer titration may be used when anhydrous conditions are critical for the downstream reaction.

All CoA data for lot A107264 are available from Aladdin Scientific upon request or via the product page.

Frequently asked questions

Is (S)-(+)-2-Amino-1-butanol soluble in water?

Yes. (S)-(+)-2-Amino-1-butanol is fully miscible with water at all practical laboratory concentrations, making it straightforward to prepare aqueous stock solutions without the need for co-solvents or heating.

How should I confirm the enantiomeric purity of this compound before use?

Enantiomeric purity is best confirmed by chiral HPLC using an appropriate chiral stationary phase, or by measuring the specific optical rotation [α]D and comparing with the certificate of analysis value. Both methods are complementary and together provide high confidence in optical integrity.

What are the typical synthetic applications of (S)-(+)-2-Amino-1-butanol?

This chiral amino alcohol is commonly used as a chiral auxiliary or building block in asymmetric synthesis, for the preparation of chiral oxazolines, as a resolving agent for racemic acids, and as an intermediate in the synthesis of pharmaceutically active compounds requiring a defined stereocentre.

Can (S)-(+)-2-Amino-1-butanol racemise during storage?

Racemisation of chiral amino alcohols under normal cold storage conditions is typically slow, but it can be accelerated by elevated temperature, exposure to strong acid or base, or oxidative conditions. To minimise risk, store tightly sealed at 2–8 °C or −20 °C under an inert atmosphere and verify optical purity before critical experiments.

What solvents are compatible with (S)-(+)-2-Amino-1-butanol for organic synthesis?

The compound is compatible with a wide range of solvents including water, ethanol, methanol, dichloromethane, tetrahydrofuran, and acetonitrile. Avoid protic solvents that may interfere with specific reactions and strongly acidic or basic media unless intentionally forming a salt.

References

1. Aladdin Scientific Product Page: (S)-(+)-2-Amino-1-butanol, SKU A107264. Product description: miscible with water.
2. March, J. Advanced Organic Chemistry: Reactions, Mechanisms, and Structure. Wiley-Interscience. General reference on amino alcohol reactivity and chiral auxiliary applications.
3. Eliel, E. L.; Wilen, S. H. Stereochemistry of Organic Compounds. Wiley. Reference for configuration assignment and optical rotation of chiral amino alcohols.

Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.