Chiral Oxathiaphospholane Sulfides for Stereo-Defined Phosphorothioate Synthesis
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Solution Overview
Problem
Current methods for preparing organothiophosphates and phosphodiester compounds face challenges in controlling stereochemical configuration and achieving high yields, particularly for larger oligonucleotides, due to the complexity of existing synthesis processes and the need for specific activators that become less effective with longer fragments.
Innovation Solution
The use of novel chiral oxathiaphospholane sulfides as reagents, which undergo cleavage upon nucleophile addition, allowing for the formation of stereo-defined organophosphorous linkages between nucleophiles, enabling the synthesis of phosphorothioate oligonucleotides and other organophosphorous compounds with improved selectivity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods are used to prepare organothiophosphates and phosphodiester compounds, then synthesis can be achieved, but stereochemical configuration control is poor and yields decrease for larger oligonucleotides
Solution Approach 1:
The invention divides the synthesis process into distinct stages: first forming the P(V) reagent with embedded stereochemical information, then using it to couple nucleophiles. This segmentation allows stereochemical control to be established early and maintained throughout the synthesis, preventing yield loss in longer oligonucleotides.
Solution Approach 2:
The patent performs preliminary action by pre-establishing the stereochemical configuration in the P(V) reagent before the actual oligonucleotide coupling reactions. The chiral auxiliary or stereo-defining group is incorporated in advance, so that subsequent couplings automatically proceed with controlled stereochemistry, eliminating the need for activators that become ineffective with longer fragments.
2Manufacturing precision
If complex synthesis processes are used to achieve stereochemical control, then some selectivity can be obtained, but the process complexity increases and becomes less effective for longer fragments
Solution Approach 1:
The P(V) reagent serves multiple functions: it provides the phosphorous linkage, establishes stereochemical configuration, and enables coupling of nucleophiles. This multi-functionality eliminates the need for separate activators and complex chiral auxiliary systems, reducing process complexity while maintaining stereoselectivity across oligonucleotides of any length.
Solution Approach 2:
The invention changes the fundamental parameter of how stereochemistry is introduced - instead of using external chiral auxiliaries or complex activators during coupling, the stereochemical parameter is built into the P(V) reagent structure itself. This parameter change simplifies the synthesis process while maintaining high stereoselectivity.
3Ease of operation
If specific activators are used for each synthesis step, then coupling can proceed, but the need for different activators for different fragment lengths increases process complexity and reduces efficiency
Solution Approach 1:
The invention extracts the activator function from the coupling step and incorporates it into the P(V) reagent structure. The reagent is pre-activated or designed to react directly with nucleophiles without requiring external activators, eliminating the complexity of selecting and optimizing activators for different fragment lengths.
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
This approach simplifies the synthesis of stereo-defined organophosphorous compounds, enhancing yield and stereoselectivity, particularly for longer oligonucleotides, by using oxathiaphospholane sulfides to form stable phosphorothioate linkages, thus overcoming the limitations of existing methods.
Implementation Method 1
undergo cleavage upon nucleophile addition, allowing for the formation of stereo-defined organophosphorous linkages between nucleophiles
Data Source
AI summary
The present invention relates to novel phosphorous (V) (P(V)) reagents, methods for preparing thereof, and methods for preparing organophosphorous (V) compounds by using the novel reagents.