CAS 269398-86-9 is an important chiral amino acid derivative with FMOC protecting group, containing chiral carbon center, amino group, carboxyl group and p-methylphenyl functional groups in its molecular structure, with high chiral purity and good chemical reactivity. It is mainly used in pharmaceutical research, peptide synthesis, chiral drug development and other fields, and is an important building block for the synthesis of bioactive molecules and pharmaceutical products. As a key chiral intermediate with FMOC protection, it is widely used in solid-phase peptide synthesis (SPPS) and liquid-phase peptide synthesis, serving as a chiral amino acid building block to construct polypeptide chains with specific functions. The FMOC protecting group in its molecule can be selectively removed under mild basic conditions without affecting other functional groups, which is convenient for the step-by-step synthesis of peptides and improves the efficiency and purity of peptide synthesis. It is also used in the research and synthesis of pharmaceutical products such as anti-tumor drugs, anti-inflammatory drugs and central nervous system drugs. The p-methylphenyl group in its molecule can enhance the lipophilicity and metabolic stability of the target drug, while the chiral amino acid structure can regulate the biological activity, enantioselectivity and pharmacokinetic properties of the drug, providing important support for the research and development of new drugs with high efficiency and low toxicity. In addition, it serves as a standard substance in chiral synthesis research and pharmaceutical quality control, ensuring the accuracy and reliability of synthesis and detection processes. It can also be used in the study of organic reaction mechanisms, especially in the research of FMOC protection/deprotection reactions and chiral amino acid modification reactions, providing a basis for the innovation and optimization of chemical synthesis technology. Due to its unique structure and good compatibility, it is also widely used in the development of peptide drugs, bioactive peptides and other fields, playing an important role in promoting the progress of pharmaceutical and chemical industries.

CAS 269398-86-9 is classified as an irritant (GHS hazard symbol: GHS07; hazard statements: H315, H319, H335), with certain potential hazards that require standard operating procedures during handling and use. It is irritating to the skin, eyes and respiratory tract; direct skin contact may cause skin irritation, such as redness, itching, dryness and mild allergic reactions, and long-term contact may lead to skin dryness and chapping. Eye contact may cause severe eye irritation, including conjunctival hyperemia, burning sensation, corneal irritation and blurred vision, which may cause persistent discomfort if not treated in time. Inhalation of dust or vapor may cause respiratory tract irritation, such as cough, chest tightness, sore throat and difficulty breathing, especially for people with respiratory system diseases, which may aggravate symptoms. There is no obvious acute toxicity, but accidental ingestion may cause gastrointestinal discomfort such as nausea, vomiting, abdominal pain and diarrhea. During operation, all operations shall be carried out in a well-ventilated fume hood and under dark conditions to avoid light. Operators shall wear nitrile gloves, protective clothing, safety goggles and dust mask to avoid direct contact, inhalation of dust and accidental ingestion. Do not eat, drink or smoke during operation, and clean the face and hands thoroughly after operation to prevent residual substances from causing harm. The operation area shall be equipped with emergency rescue equipment and first aid drugs, and avoid contact with strong acids, strong bases, strong oxidants and heavy metal ions to prevent decomposition, racemization and side reactions. For storage and transportation, it shall be stored in a sealed double aluminum vacuum packaging with desiccant inside, and the outer packaging shall be reinforced with HDPE barrel or cardboard barrel; the storage temperature shall be controlled at 2–8 ℃ (refrigeration), protected from light, moisture and high temperature. Transportation shall adopt full cold chain, avoid violent vibration, sun exposure and moisture, and shall be transported in accordance with the regulations of general hazardous chemicals, and shall not be mixed with food, feed, strong oxidants, strong bases and heavy metal compounds. Waste residues and contaminated packaging shall be disposed of in strict accordance with the management regulations of hazardous chemicals, and shall not be directly discharged into water bodies, soil or sewers to avoid environmental pollution; the waste shall be collected and treated by professional hazardous waste disposal institutions in accordance with relevant regulations. First aid measures: In case of skin contact, immediately take off contaminated clothes, rinse thoroughly with plenty of soapy water and clean water for at least 15 minutes, and seek medical advice if there is discomfort; in case of eye contact, rinse with plenty of water for at least 15 minutes and seek medical advice in time; in case of accidental ingestion, do not induce vomiting, keep the patient in a supine position, and seek medical treatment immediately with the product label; in case of inhalation discomfort, move to a well-ventilated place and seek medical advice if symptoms persist.