For chemists and researchers in the B2B sector, a thorough understanding of chemical properties is fundamental to successful synthesis and application. Boc-Leu-ONp, identified by CAS number 3350-19-4, is a key intermediate whose chemical characteristics are vital for its effective use, particularly in peptide synthesis and pharmaceutical research. This article provides an overview of its properties and discusses why reliable sourcing is important, with insights from NINGBO INNO PHARMCHEM, a prominent chemical supplier.

Boc-Leu-ONp, or N-Boc-L-Leucine 4-nitrophenyl ester, is a derivative of the amino acid leucine. Its molecular formula is C17H24N2O6, and it has a molecular weight of approximately 352.38 g/mol. The compound's structure is key to its functionality. It features the tert-butyloxycarbonyl (Boc) group, which is a widely used protecting group for amines in organic synthesis. The Boc group is stable under basic conditions but can be readily cleaved using mild acidic treatments, such as trifluoroacetic acid (TFA), which is a common step in solid-phase peptide synthesis.

The other critical functional group is the 4-nitrophenyl ester. This ester linkage activates the carboxyl group of leucine, making it a good electrophile. The 4-nitrophenol moiety is an excellent leaving group, meaning it detaches easily during a nucleophilic attack by an amine. This activation is what enables Boc-Leu-ONp to efficiently form amide bonds, the characteristic linkage in peptides. The efficiency of this coupling reaction is often high, with minimal side reactions or racemization, which is crucial for maintaining the stereochemical integrity of the synthesized peptides. For B2B clients, this means consistent and predictable reaction outcomes.

When considering the procurement of Boc-Leu-ONp, buyers should pay close attention to its physical properties and purity. While specific appearances can vary slightly, it is typically described as a white powder. Purity is usually specified as ≥ 97% by HPLC, a critical parameter for its intended applications in peptide synthesis and as a pharmaceutical intermediate. Impurities can lead to failed reactions, difficult purification, and ultimately, compromised product quality.

For those looking to buy Boc-Leu-ONp, understanding the market and reliable suppliers is essential. Manufacturers in China, such as NINGBO INNO PHARMCHEM, are key players in providing high-quality chemical intermediates at competitive prices. When evaluating suppliers, it is important to request detailed product specifications, Certificates of Analysis (COA), and Safety Data Sheets (SDS). These documents provide critical information on purity, physical and chemical properties, and safe handling procedures. Ensuring a stable supply chain with consistent quality is paramount for any B2B operation.

In essence, the chemical properties of Boc-Leu-ONp (CAS 3350-19-4) make it an invaluable tool for modern organic synthesis, particularly in the creation of peptides and pharmaceutical compounds. Its stable yet cleavable Boc protection and its activated ester functionality allow for precise and efficient amide bond formation. For businesses seeking this essential intermediate, partnering with a reputable supplier like NINGBO INNO PHARMCHEM ensures access to quality materials that drive scientific and commercial success.