Overview
N-Carbobenzyloxy-D-alaninol is a specialized chiral compound primarily employed in asymmetric synthesis and peptide chemistry. The carbobenzyloxy (Cbz) protecting group makes it particularly useful in stepwise peptide chain elongation, where selective deprotection is required. This derivative maintains the stereochemical integrity of the D-alanine precursor while providing an alcohol functional group for further modifications. As a building block in pharmaceutical manufacturing, it contributes to the synthesis of bioactive peptides and peptidomimetics. The compound's stability under basic conditions and selective deprotection under hydrogenolysis make it a versatile intermediate in medicinal chemistry applications.
Physical and Chemical Properties
The compound crystallizes in a stable orthorhombic system with characteristic IR absorption bands at 3300-3500 cm-1 (O-H stretch) and 1700 cm-1 (C=O stretch). Its optical rotation typically ranges between +12° to +15° in methanol at 20°C, reflecting the D-configuration's stereochemical purity. Thermogravimetric analysis shows decomposition above 200°C, making it suitable for most solution-phase reactions. The benzyloxycarbonyl group provides UV activity (λmax ~260 nm), allowing for convenient reaction monitoring by HPLC. The alcohol functionality participates in standard acylation and oxidation reactions while the protected amine resists nucleophilic attack.
Main Applications
In peptide synthesis, this compound serves as a C-terminal alcohol or side-chain modifier, particularly in solid-phase peptide synthesis (SPPS) protocols. Pharmaceutical manufacturers utilize it to construct constrained peptide analogs where the hydroxyl group enables cyclization or glycosylation. The material has shown utility in catalytic asymmetric synthesis as a chiral auxiliary or ligand precursor. Recent applications include incorporation into antimicrobial peptoids and as a scaffold for protease inhibitor development. Its stability makes it preferable to Boc-protected analogs in certain multi-step syntheses requiring basic conditions.
Safety and Storage
As a moisture-sensitive compound, it requires storage with desiccant in amber glass containers under argon or nitrogen atmosphere. Prolonged exposure to air leads to gradual decomposition and loss of chiral purity. The material presents moderate acute toxicity (LD50 oral rat >500 mg/kg) and requires standard laboratory precautions. Spills should be contained with inert absorbents and disposed as hazardous organic waste. In case of skin contact, wash immediately with copious water. The Cbz group generates benzyl alcohol upon hydrogenolysis, requiring proper ventilation during large-scale deprotection reactions.
B2B Procurement Guide
Industrial buyers should verify certificates of analysis for enantiomeric excess (typically ≥98% ee) and residual solvent content. Batch-to-batch consistency is critical for pharmaceutical applications, requiring supplier audits for GMP compliance if intended for API synthesis. Technical specifications should include: chiral purity by HPLC, melting point range, optical rotation value, and heavy metal content. For bulk orders (>100kg), consider manufacturers with in-house chiral chromatography capabilities to ensure quality control. Lead times often range 4-6 weeks for custom quantities due to specialized production requirements.
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