Description

D-Cysteine, 1-Methylethyl Ester (9Ci) is a specialized chiral building block and protected derivative of the amino acid cysteine. This compound is valued for its role in asymmetric synthesis and peptide chemistry, where it provides a crucial handle for the controlled introduction of sulfur-containing functionalities. It is primarily utilized by research institutions and manufacturers in the pharmaceutical, agrochemical, and advanced materials sectors for developing novel active ingredients and complex organic molecules.

Application

• Pharmaceutical Intermediate: A key chiral synthon for the synthesis of novel drug candidates, particularly those targeting neurological and metabolic disorders.
• Peptide Synthesis: Serves as a protected cysteine derivative in solid-phase and solution-phase peptide synthesis to prevent unwanted side reactions.
• Asymmetric Catalysis: Employed as a ligand precursor or chiral auxiliary in metal-catalyzed reactions to induce stereoselectivity.
• Agrochemical Research: Used in the development of new pesticides and herbicides where the specific stereochemistry influences biological activity.
• Bioconjugation Chemistry: Facilitates the site-specific modification of proteins and other biomolecules due to its reactive thiol group (when deprotected).
• Material Science: Investigated for creating self-assembled monolayers (SAMs) and functionalized surfaces with specific chemical properties.

Basic Information

Item	Detail
Product Name	D-Cysteine, 1-Methylethyl Ester (9Ci)
CAS No.	208656-55-7
Molecular Formula	C6H13NO2S
Molecular Weight	163.24 g/mol
Synonyms	D-Cysteine isopropyl ester; (R)-2-Amino-3-mercaptopropanoic acid 1-methylethyl ester; Isopropyl D-cysteinate; D-Cys-OiPr; D-Cysteine isopropylester; (R)-Isopropyl 2-amino-3-mercaptopropanoate; 208656-55-7
EINECS	Contact for details

Quality Control

Our D-Cysteine, 1-Methylethyl Ester (9Ci) is produced under strict quality management protocols. Each batch is subjected to comprehensive analytical testing, including chiral purity analysis by HPLC, to ensure high chemical and enantiomeric purity suitable for demanding synthetic applications. Certificates of Analysis (COA) with detailed chromatographic data are provided to guarantee traceability and batch-to-batch consistency.

Storage

Preserve in a tightly closed container, protected from light. Due to its properties of being easily oxidized (store under inert atmosphere) and highly volatile, it is recommended to store the material under an inert gas (e.g., nitrogen or argon) at 2-8°C for long-term stability. Keep the container in a cool, dry, and well-ventilated place.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms to structure
Purity (HPLC)	≥ 97.0%
Chiral Purity (HPLC)	≥ 99.0% ee
Water Content (KF)	≤ 0.5%

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