Oxime Intermediate Synthesis for 3'-N Nucleosides
Solution Overview
Problem
The synthesis of amines through azide intermediates is hazardous and inefficient for commercial-scale production of modified oligonucleotides, which often requires multiple steps with low yield and purity.
Innovation Solution
A novel synthetic route using an oxime intermediate to produce amine-substituted moieties, such as 3′-N nucleosides, which involves converting a hydroxyl or carbonyl moiety to an oxime, then selectively reducing it to a hydroxylamine, and finally forming the amine compound, thereby avoiding hazardous azides and simplifying the synthesis process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If azide intermediates are used for amine synthesis, then amine compounds can be produced, but the process becomes hazardous and inefficient for commercial-scale production
Solution Approach 1:
The patent replaces hazardous azide intermediates with oxime intermediates as the mediating compound in the amine synthesis pathway. The oxime intermediate is formed from the carbonyl compound and hydroxylamine, then selectively reduced to produce the amine without generating hazardous azide byproducts, thus eliminating the safety hazards while maintaining synthetic utility.
2Productivity
If traditional azide-based synthetic routes are used, then amine-substituted nucleosides can be produced, but the process requires multiple steps with low overall yield
Solution Approach 1:
The patent segments the synthesis into distinct modular stages: (1) formation of oxime intermediate from carbonyl compound, (2) selective reduction of oxime to hydroxylamine, and (3) conversion to amine product. This segmentation allows each step to be optimized independently and enables telescoping of operations to reduce the total number of steps and improve overall yield.
Solution Approach 2:
The patent performs preliminary protection of functional groups and formation of the oxime intermediate before the final amine formation step. This preliminary action prepares the molecule in advance for the subsequent transformation, allowing for better control of reaction conditions and higher overall yields by preventing side reactions.
3Manufacturing precision
If traditional synthetic routes are used for modified nucleosides, then the compounds can be produced, but the process has low purity and is suboptimal for commercial manufacture
Solution Approach 1:
The patent employs parameter changes including temperature control, solvent selection, and reagent stoichiometry optimization to achieve high purity products. The selective reduction step uses specific reducing agents and conditions that favor the desired transformation while minimizing side products, enabling straightforward purification and scaling to commercial manufacture.
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 method provides a safer, more efficient, and scalable synthesis of oligonucleotides with improved yield and purity, reducing the complexity and hazards associated with traditional azide-based methods.
Implementation Method 1
converting the 3′-oxime modified nucleoside to a 3′-NH modified nucleoside
Data Source
AI summary
Provided herein are novel synthetic routes to amines through an oxime intermediate, e.g., 3′-N nucleosides and novel and intermediate compounds produced during these synthetic procedures.