Overview
Hydroquinidine, a hydrogenated derivative of quinidine, is a stereoisomer of hydroquinine. It belongs to the cinchona alkaloid family and is widely recognized for its role in asymmetric catalysis and medicinal chemistry. As a chiral auxiliary, it facilitates enantioselective reactions, particularly in the synthesis of biologically active compounds. Its antiarrhythmic properties stem from sodium channel blockade, though its clinical use is less common than quinidine.
Physical and Chemical Properties
Hydroquinidine crystallizes as a white powder with a melting point of 169-171°C. It exhibits optical activity due to its stereogenic centers, typically with [α]D values around +220° (in chloroform). The compound is weakly basic (pKa ~8.5) and demonstrates moderate solubility in polar organic solvents like ethanol, while being sparingly soluble in water. Its stability is compromised under strong acids, bases, or prolonged UV exposure.
Main Applications
In organic synthesis, hydroquinidine serves as a chiral ligand or phase-transfer catalyst for asymmetric transformations, such as Sharpless dihydroxylations. Pharmaceutical applications include its use as a Class Ia antiarrhythmic agent, though it's primarily employed in research settings today. It also finds niche use in chiral resolution and as a reference standard for analytical methods. Recent studies explore its potential in neurodegenerative disease research due to its modulation of ion channels.
Safety and Storage
Hydroquinidine requires careful handling as it may cause toxicity upon ingestion or skin absorption. Proper PPE (gloves, goggles) is essential during manipulation. Storage should be in airtight containers at room temperature, protected from humidity and light to prevent degradation. Disposal must comply with local regulations for alkaloid compounds. Spills should be contained with inert absorbents and cleaned promptly with appropriate solvents.
B2B Procurement Guide
When sourcing hydroquinidine, prioritize suppliers with ISO 9001 certification and batch-specific COAs (Certificates of Analysis). Key specifications include chemical purity (≥98%), enantiomeric excess (ee), and residual solvent levels. Bulk pharmaceutical-grade material typically commands higher prices. Lead times may vary (2-8 weeks) due to specialized synthesis requirements. Consider multi-kilogram contracts for better pricing from manufacturers in China or India.