aspartimide formation during peptide synthesis Aspartimide formation - Aspartimide formationmass difference aspartimide formation during peptide synthesis Mastering Peptide Synthesis: Strategies to Mitigate Aspartimide Formation

Aspartimidestructure Aspartimide formation is a well-documented and persistent challenge within the realm of peptide synthesis, particularly in Fmoc solid phase peptide synthesis (SPPS). This undesirable side reaction can significantly compromise the yield and purity of synthesized peptides, leading to costly purification processes or even rendering certain peptide sequences inaccessible. Understanding the mechanisms and implementing effective prevention strategies is crucial for researchers and chemists aiming for successful and efficient peptide synthesis.

At its core, aspartimide formation is a cyclization event. It occurs when the alpha-carboxyl amide bond of an aspartic acid residue undergoes ring closure with the beta-carboxyl side chain. This process is often implicated in the Fmoc-based solid phase peptide synthesis of peptides containing aspartic acidThe use of the aspartic acid derivatives according to the present invention leads to the minimization of base catalyzedaspartimide formation during peptide.... The formation of the cyclic aspartimide is a two-step reaction. Initially, the cyclic aspartimide is formed, which can then re-open.Aggregation, Racemization and Side Reactions This re-opening can lead to the formation of epimerized alpha- and beta-Asp peptides, further complicating the purity profile of the final product. The aspartimide structure itself is a key intermediate in this problematic pathway.Preventing aspartimide rearrangements during fmoc-based ...

Several factors can exacerbate aspartimide formation during peptide synthesis. One of the primary culprits is the repeated exposure of aspartic acid-containing sequences to bases, most notably piperidine, which is commonly used for Fmoc deprotection. This exposure is a direct cause of the issue, as highlighted by studies showing that piperidine exhibits a marked tendency to induce aspartimide formation during Fmoc deprotection, particularly in sequences like Asp-Gly.Solving Aspartimide Formation in Fmoc SPPS with ... Consequently, aspartimide formation is more likely to occur during rapid peptide synthesis protocols that involve frequent or aggressive deprotection steps.作者：TL Pham·2022·被引用次数：9—The two most common problems in SPPS arepeptideaggregationduring synthesisandaspartimide formation, which can naturally coincide.

The sequence of amino acids within the peptide chain also plays a significant role.Aspartimide formation 1,2is caused by repeated exposure of aspartic acid-containing sequencesto bases like piperidine and can result ultimately in the ... For instance, peptides containing the Asp-Gly sequence are particularly prone to aspartimide formation, with estimates suggesting it can occur to the extent of approximately 0.5% per cycleIn solid-phase peptide synthesis, why are the formation of .... The sequence dependence of aspartimide formation has been extensively studied, revealing that certain arrangements of amino acids can increase the likelihood of this side reaction.

Fortunately, a variety of strategies have been developed to combat and minimize aspartimide formation. One approach involves incorporating a blocking group on the alpha-nitrogen of the amino acid preceding aspartic acid in the peptide sequence. This steric hindrance can effectively prevent the cyclization event.ASPARTIMIDE FORMATION Furthermore, the judicious selection of protecting groups for the aspartic acid side chain is paramount作者：K Sato·2024·被引用次数：8—We introduce an approach that utilizes hydrazide as a carboxylic-acid-protecting group to reduce theformationofaspartimide.. For example, the use of certain aspartic acid derivatives has been shown to lead to the minimization of base-catalyzed aspartimide formation during peptide synthesis. Innovations in protecting group chemistry, such as the use of cyanosulfurylides as carboxylic acid-protecting groups, offer additional avenues for prevention of aspartimide formation during peptide synthesis.Identification, occurrence and prevention of aspartimide ...

Another effective method is the utilization of specialized reagents and techniques作者：TL Pham·2022·被引用次数：9—The two most common problems in SPPS arepeptideaggregationduring synthesisandaspartimide formation, which can naturally coincide.. Employing a slower-acting coupling reagent can reduce the propensity for aspartimide formation, as opposed to rapid synthesis methods.作者：V Aucagne·2025·被引用次数：1—We show that theformationofaspartimideand derived byproducts can be limited by adopting “good NCL practices”, which involve restricting the ligation ... Adapting "good NCL practices," which involve restricting ligation steps, can also limit the formation of aspartimide and its derived byproducts. Researchers have also explored the use of hydrazide as a carboxylic-acid-protecting group to reduce aspartimide formation.

The challenges associated with aspartimide formation are not limited to linear peptides. It can also complicate the synthesis of cyclic peptides on solid phase. Developing methods to detect and control this phenomenon is therefore essential for a broad range of peptide chemistry applications.

In summary, aspartimide formation remains a significant hurdle in peptide synthesis, particularly within the Fmoc solid phase peptide synthesis framework. Its occurrence leads to low yields and necessitates robust prevention strategies.Identification, occurrence and prevention of aspartimide ... By understanding the underlying mechanisms, recognizing sequence-dependent vulnerabilities, and strategically employing advanced protecting groups, coupling reagents, and synthetic protocols, chemists can effectively mitigate this side reaction, ensuring the successful and efficient production of high-purity peptides. The ongoing research and development in this area continue to provide valuable insights and tools for overcoming this persistent challenge in peptide chemistry.2021年5月26日—I'm studying solid-phasepeptide synthesis(SPPS) at the moment, and a common problem is theformationof aspartimides, which disrupt the synthetic process.