Quinolone Synthesis via One-Pot Sequential Reaction
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Solution Overview
Problem
Current methods for synthesizing quinolone compounds are inefficient, requiring expensive starting materials, low yields due to poor selectivity, and complex multi-step processes.
Innovation Solution
A process involving the reaction of a compound of Formula A with R5NH2 and R6Cl in the presence of a base to form a compound of Formula I, which can be further processed to obtain quinolone compounds through oxidation and subsequent reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If process (a) is used to synthesize quinolone compounds, then the reaction can proceed with available starting materials, but the manufacturing cost increases due to expensive EMME reaction starting materials and the yield decreases due to low selectivity in cyclization
Solution Approach 1:
The patent changes the reaction parameters by using different starting materials (aniline derivatives instead of EMME reaction substrates) and different cyclization conditions (polyphosphoric acid or polyethyl phosphate instead of POCl3), which improves both the availability and the yield of the synthesis process
Solution Approach 2:
The patent replaces expensive starting materials (EMME reaction substrates and POCl3) with cheaper alternatives (aniline derivatives and polyphosphoric acid/polyethyl phosphate), thereby reducing manufacturing cost while maintaining or improving yield
2Quantity of substance
If process (b) is used to synthesize quinolone compounds, then the yield can be improved, but the manufacturing cost increases due to expensive ethyl 2-fluorobenzoylacetate and the ease of operation deteriorates due to the low melting and boiling points of triethyl orthoformate
Solution Approach 1:
The patent replaces expensive ethyl 2-fluorobenzoylacetate with cheaper aniline derivatives and replaces unstable triethyl orthoformate with stable polyphosphoric acid or polyethyl phosphate, thereby improving both cost-effectiveness and storage stability
Solution Approach 2:
The patent changes the physical state parameters of the reagents from low melting/boiling point liquids (triethyl orthoformate) to stable solids or viscous liquids (polyphosphoric acid, polyethyl phosphate), which improves ease of manufacture and storage
3Ease of manufacture
If process (c) is used to synthesize quinolone compounds, then the starting materials are readily available, but the device complexity increases due to five synthesis steps and the productivity decreases
Solution Approach 1:
The patent merges multiple separate reaction steps into a one-pot sequential reaction process, where aniline derivative, amine, and sulfonyl chloride react sequentially in the presence of polyphosphoric acid or polyethyl phosphate to directly form the quinolone product, thereby eliminating the need for five separate steps and improving productivity
Solution Approach 2:
The patent performs preliminary preparation of the reaction system by adding all necessary reagents (aniline derivative, amine, sulfonyl chloride) and catalyst (polyphosphoric acid or polyethyl phosphate) at the beginning, allowing the reactions to proceed sequentially without intermediate workup steps
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 allows for the rapid, simple, and efficient construction of quinolone drug molecules, offering high yields and using inexpensive, readily available raw materials.
Implementation Method 1
reacting a compound of Formula A with R5NH2 and R6Cl in the presence of a base to form the compound of Formula I
Implementation Method 2
oxidizing the compound of Formula I to generate the compound of Formula II
Data Source
AI summary
The present application relates to processes for the preparation of quinolone compounds and intermediates thereof, particularly to processes for the preparation of quinolones and pharmaceutical intermediates of the quinolones. In particular, the present application provides a process for the preparation of a compound of Formula I, and a process for the synthesis of quinolone compounds using the compound of Formula I as an intermediate. The process for the preparation of the compound of Formula I comprises the steps of:reacting a compound of Formula A with R5NH2 and R6Cl in the presence of a base to form the compound of Formula I,