Overview
Ethyl (5S)-5-methyl-L-prolinate is a stereospecific proline derivative where the 5-position bears a methyl group in the S-configuration. This compound belongs to the class of N-protected amino acid esters, specifically designed to introduce constrained secondary structure motifs in peptide synthesis. The ethyl ester functionality provides improved solubility in organic reaction media compared to free carboxylic acid derivatives. As a chirally pure building block, it finds extensive use in medicinal chemistry for creating peptidomimetics and conformationally restricted analogs. The methyl substitution at the 5-position introduces additional steric control, making it valuable for studying enzyme-substrate interactions and designing protease inhibitors.
Physical and Chemical Properties
The compound typically presents as a low-viscosity liquid with moderate volatility. Its chiral center at C5 and constrained pyrrolidine ring structure contribute to significant optical rotation values ([α]D +15° to +25° in methanol). The ester group shows characteristic IR absorption at ~1735 cm−1 (C=O stretch) and 1H NMR signals at δ 4.1-4.3 ppm (OCH2) and 1.2-1.3 ppm (CH3). Chemical reactivity follows standard ester behavior - susceptible to hydrolysis under acidic/basic conditions and reducible to alcohols with LiAlH4. The secondary amine (pKa ~9) can participate in amide bond formation without requiring protection in some synthetic routes. The methyl group enhances lipophilicity (calculated logP ~0.8) compared to unsubstituted proline derivatives.
Main Applications
In pharmaceutical development, this compound serves as a crucial intermediate for angiotensin-converting enzyme (ACE) inhibitors and collagenase inhibitors. Its constrained structure helps mimic turn conformations in bioactive peptides, improving metabolic stability. The methyl group's steric influence is exploited to control diastereoselectivity in palladium-catalyzed α-arylation reactions. The material also finds use in organocatalysis as a precursor for Jørgensen-Hayashi-type catalysts. Recent applications include synthesis of macrocyclic depsipeptide antibiotics and as a template for foldamer research. Industrial scale use occurs in cGMP manufacturing of chiral drugs requiring FDA-compliant starting materials.
Safety and Storage
As with most organic esters, the compound is flammable (flash point ~100°C) and should be stored away from ignition sources. Although not classified as acutely toxic, prolonged skin contact may cause irritation due to potential ester hydrolysis products. Recommended PPE includes nitrile gloves and safety goggles when handling. Storage requires amber glass bottles under argon or nitrogen atmosphere to prevent moisture absorption and racemization. Shelf life extends to 2 years when refrigerated (2-8°C) with proper sealing. Large quantities should be stored in certified flammable liquid cabinets with secondary containment. Spills should be absorbed with inert material and disposed as hazardous waste.
B2B Procurement Guide
When sourcing this specialty chemical, buyers should verify: 1) Chiral purity documentation (typically ≥98% ee by chiral HPLC), 2) Residual solvent content (especially for GMP applications), and 3) Batch-to-batch consistency in physical properties. Technical grade (90-95% purity) suffices for catalyst development, while drug substance synthesis requires ≥99% purity. Lead times vary from 2-8 weeks depending on quantity (gram to kilogram scale). Preferred packaging includes septum-sealed bottles under inert gas for small quantities and stainless steel drums for bulk shipments. Some suppliers offer custom enantiomeric ratios or isotopic labeling (13C, 15N) for research applications. Always request recent stability data and impurity profiles for regulatory submissions.
Related Manufacturers
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