Icotinib Synthesis Eliminating Toxic Chlorinating Agents
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Solution Overview
Problem
Current methods for preparing Icotinib and Icotinib hydrochloride involve the use of highly toxic reagents like chlorinating agents and metal catalysts, leading to environmental pollution, high costs, and health risks due to difficulties in removing or recovering these substances.
Innovation Solution
The development of novel methods using intermediates such as compound A, compound B, and compound C, which avoid the use of high-toxic reagents and proceed under mild reaction conditions, allowing for the preparation of Icotinib and Icotinib hydrochloride in a more environmentally friendly and economically viable manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If highly toxic chlorinating agents (such as (COCl)2 or phosphorus oxychloride) are used in the preparation methods disclosed by US7078409B2 and CN130568C, then the synthesis of Icotinib can be achieved, but the reagents are difficult or costly to be completely removed in later reactions, causing severe environment pollution and health threats
Solution Approach 1:
The patent extracts and removes the highly toxic chlorinating agents ((COCl)2, phosphorus oxychloride) from the synthesis pathway entirely. Instead, it uses non-toxic or low-toxic reagents such as carbon dioxide, triethylamine, and other benign chemicals to achieve the same synthetic transformations, thereby eliminating the harmful factors while maintaining manufacturing feasibility
Solution Approach 2:
The patent replaces expensive and hazardous reagents that require complex removal procedures with inexpensive, easily removable reagents. The new reagents system allows for simple filtration and washing steps to remove byproducts, eliminating the costly and complex purification processes previously required to remove toxic chlorinating agents
2Ease of manufacture
If metal catalysts are used in the preparation method disclosed in WO2010/003313, then the synthesis of Icotinib hydrochloride can be achieved, but the metal catalysts are costly and difficult to be separated or recovered, causing severe environment pollutions
Solution Approach 1:
The patent completely removes metal catalysts from the synthesis pathway. Instead of using metal-based catalysis that requires complex separation and recovery processes, the invention employs organic chemistry transformations that proceed without metal catalysts or use easily removable organic alternatives, thereby eliminating metal contamination and environmental pollution
Solution Approach 2:
The patent introduces intermediary compounds (such as compound A, compound B, compound C in the synthetic pathway) that facilitate the reaction without requiring metal catalysts. These intermediary organic compounds act as mediators to enable the transformations needed for Icotinib synthesis while avoiding the use of harmful metal catalysts
3Productivity
If highly toxic reagents are used in existing synthetic methods, then the preparation of Icotinib intermediates can be achieved, but the methods are costly and cause severe environment pollution problems
Solution Approach 1:
The patent converts the synthetic pathway from one using harmful reagents to one using benign reagents. By redesigning the reaction sequence to use carbon dioxide, triethylamine, and other environmentally friendly chemicals, the invention maintains or improves synthesis efficiency while transforming the harmful chemical process into a beneficial, environmentally sustainable process
Solution Approach 2:
The patent changes the chemical parameters of the reaction system by substituting toxic reagents with non-toxic alternatives. This parameter change in reagent composition allows the synthesis to proceed with similar or improved efficiency while eliminating environmental pollution and health risks associated with the original toxic reagent system
Data Source
AI summary
The present invention relates to the technical field of medicine. Provided are methods of preparing icotinib, icotinib hydrochloride, and intermediates thereof. The methods avoid the use of phosphoryl chloride, thereby greatly reducing the emission of pollutants, which is of major benefit to the economy and environment.