Description

D-Cysteine, 2-Methyl-, Methyl Ester (9Ci) is a specialized, non-proteinogenic amino acid derivative characterized by its D-configuration and methyl ester functionalization. This compound is of significant value in advanced organic synthesis and pharmaceutical research, serving as a key chiral building block for the development of novel bioactive molecules and complex chemical entities. It is primarily sought by research institutions and industrial R&D departments in the pharmaceutical, agrochemical, and fine chemical sectors for applications requiring high stereochemical purity and specific molecular frameworks.

Application

• Pharmaceutical Intermediate: A critical chiral synthon in the research and development of new active pharmaceutical ingredients (APIs), particularly for peptidomimetics and enzyme inhibitors.
• Agrochemical Synthesis: Used in the creation of novel, stereospecific pesticides and herbicides where the D-configuration imparts specific biological activity or stability.
• Biochemical Research: Employed as a substrate or inhibitor in enzymatic studies to investigate stereospecificity and metabolic pathways.
• Peptide Chemistry: Serves as a protected, non-natural amino acid residue for the solid-phase or solution-phase synthesis of modified peptides with enhanced properties.
• Ligand and Catalyst Development: Utilized in the design of chiral ligands for asymmetric catalysis and metal complexes.
• Reference Standard: Acts as a high-purity analytical standard for quality control and method development in analytical laboratories.

Basic Information

Product Name	D-Cysteine, 2-Methyl-, Methyl Ester (9Ci)
CAS No.	742673-67-2
Molecular Formula	C5H11NO2S
Molecular Weight	149.21 g/mol
Synonyms	Methyl (2R)-2-amino-3-mercapto-2-methylpropanoate; (R)-2-Amino-3-mercapto-2-methylpropionic acid methyl ester; D-2-Methylcysteine methyl ester; Methyl D-2-methylcysteinate; (R)-2-Methylcysteine methyl ester; 2-Methyl-D-cysteine methyl ester; Propanoic acid, 2-amino-3-mercapto-2-methyl-, methyl ester, (2R)-
EINECS	Contact for details

Quality Control

Our D-Cysteine, 2-Methyl-, Methyl Ester (9Ci) is manufactured under strict quality management systems. Each batch undergoes comprehensive analytical testing, including chiral purity assessment by HPLC, to ensure it meets the high standards required for research and synthesis. A detailed Certificate of Analysis (COA) providing purity, identity, and impurity profile is supplied with every shipment to guarantee traceability and batch-to-batch consistency.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at a controlled room temperature (15-25°C). This product is hygroscopic (moisture-sensitive) and should be handled under dry conditions to prevent degradation.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Chiral Purity (HPLC)	≥ 99.0% de (D-isomer)
Water Content (KF)	≤ 1.0%
Residue on Ignition	≤ 0.1%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.