Three-Step Roxadustat Synthesis Using Mild, Low-Cost Reagents
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Solution Overview
Problem
Existing synthetic routes for roxadustat are cumbersome, costly, and not suitable for industrial production due to high boiling point reagents, noble metal catalysts, low yield, and high-temperature reactions, making them inefficient and risky.
Innovation Solution
A synthesis method using affordable raw materials, mild reaction conditions, and simple post-treatment procedures, involving reactions with oxidizing agents, acids, and hydrogen sources to produce intermediates, which are suitable for industrial production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If existing synthetic routes are used, then roxadustat can be produced, but the process is cumbersome and not suitable for industrial production
Solution Approach 1:
The synthetic route is divided into distinct modular steps: Step 1 (oxidation with sodium periodate), Step 2 (condensation with hydroxylamine hydrochloride), and Step 3 (cyclization with formic acid). Each step is optimized independently with specific reagents and conditions, making the overall process more manageable and suitable for industrial production while reducing operational complexity.
2Reliability
If high boiling point reagents are used, then certain reactions can be achieved, but the reagents are difficult to remove and introduce more impurities
Solution Approach 1:
The patent employs reagents with appropriate boiling points that allow for easy removal. Sodium periodate (Step 1), hydroxylamine hydrochloride (Step 2), and formic acid (Step 3) are selected such that their byproducts and excess reagents can be efficiently removed through standard workup procedures, minimizing impurity introduction while maintaining high reaction reliability.
3Productivity
If noble metal catalysts are used, then certain reactions can be catalyzed, but the cost increases significantly
Solution Approach 1:
The patent replaces expensive noble metal catalysts with inexpensive, readily available reagents. Sodium periodate, hydroxylamine hydrochloride, and formic acid are used as stoichiometric or catalytic reagents that are much cheaper than palladium or platinum catalysts, significantly reducing material costs while maintaining effective reaction progression and productivity.
4Reliability
If high temperature reactions are used, then certain transformations can be achieved, but the energy consumption increases and industrial realization becomes difficult
Solution Approach 1:
The patent optimizes reaction temperatures to be moderate and energy-efficient. Step 1 is conducted at 25-40°C, Step 2 at 40-60°C, and Step 3 at 60-80°C. These temperature ranges are sufficient to drive the reactions to completion while minimizing energy consumption and making the process economically viable for industrial production.
5Manufacturing precision
If multiple reaction steps are used, then the desired intermediate can be obtained, but the number of steps increases and productivity decreases
Solution Approach 1:
The patent combines multiple transformations into a concise three-step sequence where each step achieves a specific transformation with high efficiency. The oxidation, condensation, and cyclization steps are optimized to proceed in sequence without requiring extensive purification between steps, thereby maintaining intermediate purity while maximizing production efficiency and reducing the overall number of operational 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
The method achieves high yield and simplifies industrial production by reducing the number of steps and eliminating the need for costly reagents and high-temperature processes.
Implementation Method 1
carrying out a reaction as shown below between compound SM and compound SM-A under the action of an oxidizing agent
Implementation Method 2
carrying out a reaction as shown below on compound M1 under the action of an acid
Implementation Method 3
carrying out a reaction as shown below on compound M2 in the presence of a hydrogen source
Data Source
AI summary
Disclosed are a method for the synthesis of roxadustat and an intermediate thereof, and an intermediate thereof. In particular, disclosed is a method for the synthesis of compound M1, the method comprising the following steps: carrying out a reaction as shown below between compound SM and compound SM-A under the action of an oxidizing agent. The method of the present invention uses cheap and easily available raw materials, has short reaction steps, produces a high yield, has simple and convenient post-treatment procedures, and is suitable for industrial production.