4-Oxoquinoline Synthesis via Extraction and Inversion
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Solution Overview
Problem
Current production methods for anti-HIV agents like compound (10) face challenges such as decreased yield due to dimer formation, corrosion from hydrogen fluoride, and complex operations involving hydroxyl group protection and deprotection, making them unsuitable for industrial-scale production.
Innovation Solution
A novel synthetic intermediate, compound (2'), is developed, which allows for a more efficient production method by avoiding dimer formation and hydrogen fluoride generation, simplifying the production process and improving yield, and is stable under severe conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional production methods are used, then the synthesis pathway is established, but the yield decreases due to dimer formation
Solution Approach 1:
The patent removes the hydroxyl protecting group entirely from the synthesis pathway, extracting the source of dimer formation. By using a synthesis route that does not require protecting group manipulation, the method eliminates the dimerization side reaction that plagues conventional approaches, thereby improving yield without compromising the ability to produce the desired 4-oxoquinoline compound.
Solution Approach 2:
Instead of following the conventional approach of protecting the hydroxyl group first and then proceeding with synthesis, the patent inverts the strategy by using a synthesis pathway where the hydroxyl group remains unprotected throughout. This inversion of the standard protective strategy eliminates the need for protection/deprotection steps and prevents dimer formation.
2Ease of manufacture
If conventional production methods are used, then the reaction can proceed, but corrosion occurs from hydrogen fluoride generation
Solution Approach 1:
The patent converts the potentially harmful fluorinated intermediate stage into a beneficial approach by using a fluorinated starting material that directly yields the desired product without generating free hydrogen fluoride. The fluorine atom remains bonded throughout the synthesis, preventing HF generation while maintaining reaction feasibility.
3Ease of manufacture
If conventional production methods are used, then the synthesis can be performed, but operational complexity increases due to protection and deprotection steps
Solution Approach 1:
The patent extracts and removes the protecting group introduction and removal steps from the conventional synthesis pathway. By selecting a route where the hydroxyl group does not require protection, the method eliminates multiple operational steps, reducing complexity while maintaining the ability to synthesize the target compound.
Solution Approach 2:
The patent performs preliminary selection of a synthesis pathway where the hydroxyl group is inherently compatible with the reaction conditions, eliminating the need for subsequent protection and deprotection steps. This preliminary strategic choice simplifies the overall process by preventing the need for complex protective group manipulations.
4Ease of manufacture
If conventional production methods are used, then the synthesis pathway is established, but industrial scalability is reduced
Solution Approach 1:
The patent extracts the problematic protection/deprotection steps from the conventional synthesis pathway, creating a streamlined route suitable for industrial-scale production. By removing these complex steps, the method improves scalability while maintaining the synthetic capability to produce the desired 4-oxoquinoline compound efficiently.
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 new method enhances the industrial viability of producing anti-HIV agents by improving yield, reducing operational complexity, and ensuring the stability and quality of the synthetic intermediate, facilitating better quality control and economic production.
Implementation Method 1
reacting a compound represented by the formula [Ib], or a salt thereof, with a compound represented by the formula [XIIb] in the presence of a base and a chelator
Implementation Method 2
reacting a compound represented by the formula [Ib], or a salt thereof, with a compound represented by the formula [XIIb] in the presence of a base and a chelator
Implementation Method 3
reacting a compound represented by the formula [Ib], or a salt thereof, with a compound represented by the formula [XIIb] in the presence of a base and a chelator
Implementation Method 4
treating the resulting compound with an acid to prepare a compound represented by the formula [V], or a salt thereof
Data Source
AI summary
The present invention provides a compound useful as a synthetic intermediate for an anti-HIV agent having an integrase inhibitory activity, and a production method thereof, and a production method of an anti-HIV agent using the synthetic intermediate. Specifically, for example, a compound represented by the formula (2'): wherein R is a fluorine atom or a methoxy group, and R400 is a hydrogen atom or a C1 - C4 alkyl group, or a salt thereof, and a production method thereof, and a production method of an anti-HIV agent using the synthetic intermediate.