Formula I Intermediates for PQQ Synthesis
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Solution Overview
Problem
Current synthetic routes for pyrroloquinoline quinone (PQQ) and related compounds are complex, laborious, and involve numerous steps, making them inefficient and costly for large-scale production.
Innovation Solution
The use of compounds of Formula I, which are synthesized through a simplified process involving specific reactions with esters and bases, reducing the number of steps and improving yield, allowing for the efficient production of PQQ and its salts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional synthetic routes (Corey et al., Martin et al.) are used for PQQ production, then the synthesis can be completed, but the process involves 9-10 steps with complex and laborious workup procedures
Solution Approach 1:
The patent segments the complex 9-10 step synthesis into distinct modular stages: (i) formation of compound of formula I from compounds of formula II and III, (ii) conversion to compound of formula IV, (iii) cyclization to compound of formula V, and (iv) oxidation to final PQQ product. Each stage uses specific reagents and conditions optimized for that transformation, allowing independent optimization and simplification of each step.
Solution Approach 2:
The patent performs preliminary actions by pre-forming key intermediates (compounds of formula I) with predetermined structural features that facilitate subsequent transformations. The workup procedures are also designed as preliminary actions that simplify later steps, such as using extraction methods that pre-concentrate the product in a form ready for the next reaction.
2Ease of operation
If traditional synthetic routes are used, then PQQ can be synthesized, but the workup procedure is very complex and laborious
Solution Approach 1:
The patent employs disposable extraction systems using common solvents (ethyl acetate, dichloromethane, hexane) that can be easily removed by evaporation. These simple, readily available materials replace complex purification equipment and procedures, making the workup faster and easier while allowing complete removal of solvents to obtain pure product.
Solution Approach 2:
The patent changes physical parameters such as solvent polarity, temperature, and pH to control product isolation. For example, adjusting the pH during extraction, using solvents with different polarities for selective extraction, and controlling temperature during crystallization steps enable simple yet effective separation without complex equipment.
3Productivity
If multi-step synthesis is used for PQQ production, then the target compound can be obtained, but the process is costly and inefficient for large-scale production
Solution Approach 1:
The patent develops a universal synthesis platform where compounds of formula I serve as versatile intermediates that can be converted to multiple different products (PQQ, pyrroloquinoline derivatives, other heterocyclic compounds) through variations of the same core reaction sequence. This multi-functionality allows the same basic methodology to be applied across different target molecules, reducing development costs and improving manufacturing efficiency.
Solution Approach 2:
The patent optimizes reaction parameters (temperature, pressure, catalyst loading, solvent choice, reaction time) for each transformation step to maximize yield and minimize byproducts. By carefully controlling these parameters, the process achieves high efficiency suitable for large-scale production while reducing material waste and energy consumption.
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 process results in a cost-effective, environmentally friendly, and efficient synthesis of PQQ and its salts, reducing the number of steps from 10 to 6 and significantly improving yield, making it suitable for large-scale production.
Implementation Method 1
reacting a compound of Formula III with ester and base to obtain the compound of Formula I
Implementation Method 2
reacting a compound of Formula III with ester and base to obtain the compound of Formula I
Implementation Method 3
reacting the compound of Formula I with reducing agent to obtain a compound of Formula IV
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
The present disclosure relates to compounds of Formula (I) and process of obtaining the same. Said compounds of Formula (I) is employed in the syntheses of pyrroloquinoline quinone (PQQ), 4,5-dioxo-4,5-dihydro-1H-pyrrolo[2,3-f]quinoline-2,7,9-tricarboxylic acid 2-allyl ester, 5-ethoxy-5-hydroxy-4-oxo-4,5-dihydro-1H-pyrrolo[2,3-f]quinoline-2,7,9-tricarboxylic acid, 5- hydroxy-6-(1,1,4-trioxo-1 lambda* 6*-1,2, 5 -thiadiazolidin-2-yl)-1H-indole-2-carboxylic acid and its pharmaceutically acceptable salts. Said syntheses of compounds via. compounds of Formula (I) as intermediates employ minimum number of steps resulting in a shorter process and has improved efficiency along with many other advantages.