Product Manager: Selina Zhang; Email: selina@coreychem.com

2-Hydroxyethane-1-sulfonyl chloride (CAS: 78303-70-5) is a highly reactive bifunctional sulfonylating reagent widely used in medicinal chemistry, pharmaceutical synthesis, organic synthesis, and specialty chemical research. Featuring a hydroxyethyl chain bearing a reactive sulfonyl chloride group, it provides an exceptionally versatile platform for selective sulfonylation, sulfur-containing molecule construction, and scaffold diversification. The compound is primarily employed as a key intermediate in the synthesis of sulfonamides, sulfonate esters, sulfones, and functionalized pharmaceutical intermediates, supporting lead optimization, structure–activity relationship (SAR) studies, and scalable process development. Its primary applications are outlined below:

1. Medicinal Chemistry & Drug Discovery

Sulfonamide Pharmacophore Development

2-Hydroxyethane-1-sulfonyl chloride serves as an important precursor for synthesizing sulfonamide-containing drug candidates. Sulfonamide motifs are widely recognized as privileged pharmacophores in medicinal chemistry and are frequently incorporated into enzyme inhibitors, kinase inhibitors, antimicrobial agents, anti-inflammatory drugs, antiviral compounds, and anticancer therapeutics.

Lead Optimization in Drug Development Pipelines

The highly reactive sulfonyl chloride functionality enables efficient coupling with amines, alcohols, and other nucleophiles, allowing medicinal chemists to rapidly generate structural analogues for hit-to-lead optimization. The hydroxyethyl substituent further enables downstream derivatization to fine-tune potency, selectivity, aqueous solubility, and pharmacokinetic performance.

2. Structure–Activity Relationship (SAR) Exploration

Rapid Library Generation

The sulfonyl chloride group readily reacts with diverse nucleophilic substrates, enabling efficient preparation of structurally diverse sulfonamide and sulfonate libraries. Researchers employ this intermediate to investigate how sulfur-containing linkers influence biological activity, receptor affinity, and molecular selectivity.

Physicochemical Property Optimization

The hydroxyethyl moiety provides additional opportunities for polarity modulation, hydrogen-bonding optimization, and molecular flexibility, allowing systematic evaluation of ADME properties during medicinal chemistry campaigns.

3. Organic Synthesis & Intermediate Development

Versatile Sulfonylation Reagent

The compound is widely utilized as a general sulfonylating reagent for preparing sulfonamides, sulfonate esters, sulfones, and other sulfur-containing organic molecules. Its high electrophilicity enables efficient reactions under relatively mild synthetic conditions.

Building Block for Multifunctional Molecules

The simultaneous presence of a reactive sulfonyl chloride group and a hydroxyl functionality allows sequential functionalization, making this compound particularly valuable for multistep synthesis of complex pharmaceutical intermediates, specialty chemicals, and fine chemical products.

4. Chemical Biology & Functional Molecule Design

Probe and Linker Synthesis

Researchers utilize 2-Hydroxyethane-1-sulfonyl chloride to prepare functional molecular linkers and biologically active probes. The hydroxyethyl group provides a convenient attachment site for fluorescent labels, affinity tags, polymers, and other functional moieties used in chemical biology research.

Bioconjugation Research

The compound supports the preparation of sulfonamide-based conjugates for studying protein interactions, enzyme activity, receptor recognition, and biomolecular modification, contributing to chemical biology and molecular imaging applications.

5. Pharmaceutical Process Development

Key Intermediate for Scalable Manufacturing

The compound serves as an important intermediate in pharmaceutical process chemistry for developing scalable synthetic routes to sulfur-containing drug candidates. Its predictable reactivity and commercial accessibility support efficient route optimization, impurity control, and manufacturing scale-up.

Analytical Method Development

Researchers employ this intermediate during HPLC, LC-MS, and impurity profiling studies to establish analytical methods for pharmaceutical intermediates and finished drug substances, supporting quality control and regulatory development.

6. Specialty Chemicals & Materials Science

Functional Intermediate for Specialty Chemicals

2-Hydroxyethane-1-sulfonyl chloride is used in the preparation of specialty chemicals requiring controlled introduction of sulfonyl functionalities, including surfactants, functional additives, reactive intermediates, and performance chemicals.

Polymer and Surface Functionalization

The compound also serves as a useful reagent for introducing sulfonamide or sulfonate groups into polymers, coatings, and advanced functional materials, contributing to improvements in hydrophilicity, chemical stability, adhesion, and surface performance.

7. Handling & Storage

Storage Conditions

Store in tightly sealed containers under dry, cool (2–8 °C), and well-ventilated conditions. Protect from moisture, humidity, and direct sunlight. Because sulfonyl chlorides readily hydrolyze upon exposure to water, handling should be performed under dry conditions using appropriate personal protective equipment.

Intended Use

This product is intended strictly for laboratory research, medicinal chemistry, pharmaceutical R&D, organic synthesis, and process development. It is not intended for therapeutic, diagnostic, veterinary, food, or household applications. Standard laboratory safety procedures should be followed during storage and handling.

Summary

The value of 2-Hydroxyethane-1-sulfonyl chloride (CAS: 78303-70-5) lies in its highly reactive sulfonyl chloride functionality combined with a versatile hydroxyethyl group, providing exceptional flexibility for sulfur-containing molecule construction and molecular diversification. Its efficient sulfonylation capability, broad nucleophile compatibility, and dual-functional synthetic handle make it an important intermediate for medicinal chemistry, structure–activity relationship (SAR) studies, pharmaceutical process development, and specialty chemical synthesis. The compound supports lead optimization, scalable manufacturing, and the development of next-generation sulfonamide- and sulfonate-based functional molecules.

For more information, please contact: selina@coreychem.com