1H-Furo[3,2-b]imidazo[4,5-d]pyridine Synthesis via Segmented Steps
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Solution Overview
Problem
Existing methods for synthesizing 1H-furo[3,2-b]imidazo[4,5-d]pyridine compounds are costly, complex, and not suitable for industrial scale due to high impurities and difficult process control.
Innovation Solution
A method involving reacting compound 1 with compound 2 or its hydrochloride in the presence of a base, followed by reduction and ring-closing reactions, using specific solvents and catalysts to obtain 1H-furo[3,2-b]imidazo[4,5-d]pyridine compounds with high yield and fewer impurities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If prior art synthesis methods are used, then 1H-furo[3,2-b]imidazo[4,5-d]pyridine compounds can be synthesized, but the process is costly and complex with high impurities
Solution Approach 1:
The synthesis process is divided into three distinct steps: (1) condensation of compound 1 with compound 2 to form intermediate 3, (2) reduction of intermediate 3 to form intermediate 4, and (3) ring-closing reaction of intermediate 4 with compound 5 to yield the final product. This segmentation allows each step to be optimized independently, improving overall purity while reducing process complexity compared to one-pot methods.
Solution Approach 2:
The patent introduces specific intermediates (compound 3 and compound 4) that facilitate the transformation from starting materials to final product. These intermediates serve as controlled stepping stones, allowing precise control over the synthesis pathway and enabling purification at each stage, thereby reducing final product impurities.
2Productivity
If prior art synthesis methods are used, then compounds can be produced, but the operation is difficult to control and not suitable for industrial scale
Solution Approach 1:
The patent optimizes reaction parameters at each step: using specific bases (DBU, Na2CO3, KHCO3, or NaHCO3), controlling temperature ranges (50-80°C for step 1, 15-90°C for step 2, 80-120°C for step 3), and adjusting solvent systems (ethanol/acetonitrile mixtures). These parameter optimizations make the process more controllable and suitable for industrial scaling.
Solution Approach 2:
The synthesis method employs readily available reagents and standard laboratory equipment, eliminating the need for specialized facilities or complex process control systems. The three-step sequence uses common solvents (ethanol, acetonitrile, toluene) and standard purification techniques, making the process self-sufficient and easily scalable to industrial production.
3Quantity of substance
If prior art synthesis methods are used, then products can be obtained, but the cost is high
Solution Approach 1:
The patent employs straightforward purification methods at each step (filtration, extraction, crystallization) that recover unreacted starting materials and intermediates for potential reuse. The simple work-up procedures minimize material loss and reduce the need for expensive purification techniques, thereby lowering overall synthesis costs while maintaining high yield.
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 method achieves high yield, reduces impurities, simplifies operation, and lowers costs, making it suitable for industrial-scale production.
Implementation Method 1
reacting compound 1 with compound 2 or compound 2 hydrochloride in a solvent in the presence of a base to obtain compound 3
Implementation Method 2
subjecting the compound 3 to a reduction reaction to obtain compound 4 or compound 4 hydrochloride
Implementation Method 3
subjecting the compound 4 or compound 4 hydrochloride to a ring-closing reaction with compound 5 or compound 5′ to obtain compound 6
Data Source
AI summary
Provided is a method for synthesizing 1H-furo[3,2-b]imidazo[4,5-d]pyridine compounds. The method comprises the following steps of: reacting compound 1 with compound 2 in a solvent in the presence of a base to obtain compound 3; subjecting the compound 3 to a reduction reaction to obtain compound 4; and subjecting the compound 4 to a ring-closing reaction with compound 5 or compound 5′ to obtain compound 6 or a hydrate thereof, wherein R is methyl or ethyl, the methyl or ethyl is optionally substituted by hydroxyl, and X═O or CH2. The method for synthesizing the 1H-furo[3,2-b]imidazo[4,5-d]pyridine compound has the advantages of high yield, fewer impurities and is easy to control, saves the cost. The method is simple and convenient to operate, and is suitable for industrial scale.