N-Alkylated Oligonucleotides Preventing Alkyl Migration
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Solution Overview
Problem
Current methods for synthesizing alkylated nucleosides and nucleotides are hindered by instability issues, such as the migration of alkyl groups during synthesis, which results in impurities and reduces the effectiveness of these compounds in studying DNA damage and repair mechanisms.
Innovation Solution
Development of N-alkylated pyrimidines and purines with specific nucleobase and sugar protection, along with corresponding phosphoramidites, that allow for the synthesis of oligonucleotides with defined alkylated bases, enabling selective deprotection without alkyl substituent migration, thereby producing high-purity oligonucleotides for studying DNA base mutagenesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods are used to synthesize alkylated nucleosides, then the synthesis process can be completed, but alkyl group migration occurs during synthesis resulting in impurities and reduced stability
Solution Approach 1:
The patent applies preliminary action by introducing protecting groups on the nucleobase before alkylation occurs. These protecting groups prevent alkyl group migration during subsequent synthesis steps, ensuring the alkylated base remains stable and pure throughout the oligonucleotide synthesis process. The protecting group is installed in advance to prevent the harmful effect of alkyl migration.
Solution Approach 2:
The patent uses a protecting group as an intermediary substance between the nucleobase and the alkylating agent. This protecting group mediates the interaction by preventing direct contact that would cause alkyl group migration, while still allowing the synthesis process to proceed. The protecting group acts as a barrier that maintains the stability of the alkyl substituent during synthesis.
2Ease of manufacture
If alkylated nucleosides are synthesized without protection, then the synthesis is simpler, but alkyl group migration causes impurities and reduces effectiveness in studying DNA damage
Solution Approach 1:
The protecting group is introduced in a preliminary step before alkylation. This preliminary action prevents alkyl group migration during the synthesis process, ensuring that the alkylated nucleoside maintains its structural integrity and reliability for studying DNA damage mechanisms, while the additional step is justified by the need for accurate experimental results.
3Productivity
If selective deprotection is performed without specific conditions, then the process is faster, but alkyl substituent migration occurs reducing purity
Solution Approach 1:
The patent applies parameter changes by using specific deprotection conditions (such as controlled pH, temperature, and time parameters) that allow selective removal of the protecting group without causing alkyl group migration. By optimizing these parameters, the process achieves both speed and purity, maintaining the integrity of the alkyl substituent while efficiently completing the deprotection step.
Data Source
AI summary
This invention relates to n-alkylated synthetic nucleosides and phosphoramidites of high regio-specific purity and stability and for selective deprotection of the protecting group in oligonucleotides for the purpose of synthesis of high purity selectively n-alkylated sequence specific DNA and RNA. Such oligonucleotides are useful for study of mechanism of cytotoxic and mutagenic DNA damage, detection and reversal of cellular cytotoxic and mutagenic damages that occurs from the incorporation of methylated nucleosides, the corresponding phosphates and triphosphates and their precursors, via de novo DNA synthesis. The reagents could be extremely valuable tools as diagnostics and mutagenic reversal reagents. The present invention describes N-1-nitrogen alkylated purine and N-3 nitrogen alkylated pyrimidines with appropriate nucleobase amino protection, which are selectively deprotected with minimal migration of the alkyl substituent under the condition which are required for synthesizing high purity regiospecific N-1 and N-3 nitrogen alkylated oligonucleotides. A novel process has been developed to synthesize N-3 nitrogen alkylated cytidine.