Azidomethoxy Cleavage Chemistry for Faster Nucleic Acid Sequencing
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Solution Overview
Problem
Existing cleavage reagents for the azidomethoxy group in nucleic acid sequencing require a long time to achieve high efficiency, leading to low overall reaction efficiency.
Innovation Solution
A method involving a mixed system of a compound containing an azidomethoxy group, a palladium compound, and an organic phosphine under specific conditions to accelerate the reduction of azidomethoxy to hydroxy, using a molar ratio of 2:1 to 2000:1 and optimized reaction parameters such as temperature, pH, and metal ion concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing cleavage reagents (THP, TCEP, THMP, THEP, DTT) are used to cleave the azidomethoxy group, then the cleavage reaction can proceed, but the reaction time is long and the overall efficiency is low
Solution Approach 1:
The patent changes the chemical parameters of the cleavage reagent by introducing a palladium compound (Pd(0), Pd(I), or Pd(II)) in combination with organic phosphine or phosphite. This parameter change transforms the reaction mechanism and dramatically accelerates the cleavage of the azidomethoxy group, achieving 90-100% conversion within 20-30 seconds at room temperature, compared to the lengthy reaction times required by conventional reagents.
Solution Approach 2:
The invention employs a composite cleavage system consisting of a palladium compound combined with organic phosphine or phosphite. This composite reagent system synergistically enhances the cleavage capability, where the palladium catalyst activates the azidomethoxy group for rapid reduction while the phosphine/phosphite ligands stabilize the palladium species and modulate reactivity, achieving unprecedented reaction efficiency.
2Reliability
If the reaction time is extended to achieve high cleavage efficiency with existing reagents, then the cleavage completeness improves, but the overall sequencing process efficiency decreases
Solution Approach 1:
The patent optimizes the concentration parameters of the palladium compound (0.01-10 mM) and ligand (0.1-50 mM) to achieve optimal balance between cleavage completeness and reaction speed. Under these optimized parameters, the system achieves 90-100% cleavage efficiency within 20-30 seconds, eliminating the need for prolonged reaction times while ensuring complete cleavage.
Solution Approach 2:
The invention introduces a dynamic, controllable cleavage process using palladium-catalyzed reaction that can be precisely controlled by adjusting reagent concentrations, temperature, and reaction time. This dynamic system allows the reaction to reach completion rapidly (20-30 seconds) without requiring extended incubation, thereby maintaining high productivity while ensuring complete cleavage.
3Loss of time
If a rapid cleavage method is implemented, then the reaction time decreases, but the reaction conditions become more complex requiring palladium compounds and organic phosphines
Solution Approach 1:
The palladium compound with organic phosphine or phosphite ligands serves multiple functions: it acts as a catalyst to accelerate the cleavage reaction, a stabilizing agent to prevent side reactions, and a controllable reagent system where ligand-to-metal ratios can be adjusted to optimize performance. This multi-functional system achieves rapid cleavage (20-30 seconds) while maintaining manageable complexity through well-defined stoichiometric relationships.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method significantly improves the reaction efficiency of reducing azidomethoxy to hydroxy, achieving 90%-100% efficiency within 20-30 seconds, enhancing the overall sequencing process by accelerating the cleavage reaction.
Implementation Method 1
the palladium compound is used for promoting oxidation-reduction reaction between the compound containing the azidomethoxy group and the organic phosphine
Implementation Method 2
the palladium compound is used for promoting oxidation-reduction reaction between the compound containing the azidomethoxy group and the organic phosphine, so that the reaction process of reducing the azidomethoxy group into hydroxy is accelerated
Data Source
AI summary
The present application relates to the technical field of metal ion chemistry, and provides a method for reducing an azidomethoxy group, a sequencing method, and a kit. The method for reducing the azidomethoxy group provided in the present application comprises: mixing a compound I comprising the azidomethoxy group, a palladium compound, and an organic phosphine to give a mixed system, and placing the mixed system under a condition suitable for a chemical reaction to reduce the azidomethoxy group of the compound I into hydroxy, wherein the azidomethoxy group has a chemical formula of —O—CA1(N3)-A2, and A1 is selected from one of hydrogen, substituted or unsubstituted hydrocarbyl, substituted or unsubstituted cyclic hydrocarbyl, substituted or unsubstituted heteroatom-containing hydrocarbyl, substituted or unsubstituted heteroatom-containing cyclic hydrocarbyl, substituted or unsubstituted aryl, and substituted or unsubstituted heteroaryl. According to the method provided in the present application, the palladium compound is introduced into the reaction system, so that an oxidation-reduction reaction between the azidomethoxy group and the organic phosphine is accelerated.