Quinazoline Synthesis Scale-Up via Safer Reagents
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Solution Overview
Problem
The existing synthetic route for quinazoline-based kinase inhibitors faces challenges during scale-up, including variable yields, the use of hazardous reagents, and laborious purification processes, making it inefficient for producing multi-kilograms of these compounds for pharmaceutical applications.
Innovation Solution
A new multi-step synthetic process involving reactions such as condensation with formamidine, SNAr attacks with alkanolamine, chlorination, and urea bond formation, optimized to provide high yields and purity through centrifugation and recrystallization, replacing hazardous reagents and reducing the need for column chromatography.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the existing synthetic route is used for scale-up production, then the production capacity increases, but the yield becomes variable and the cost increases
Solution Approach 1:
The patent modifies reaction parameters including using K2CO3 instead of NaH as base, changing solvent systems, and optimizing temperature and time parameters to achieve consistent high yields during scale-up from milligram to kilogram quantities
Solution Approach 2:
The patent replaces expensive and hazardous reagents with cheaper, safer alternatives that maintain or improve yield consistency, such as using K2CO3/DMF instead of NaH/DMF, and employing standard purification techniques instead of repeated column chromatography
2Ease of manufacture
If the existing synthetic route is used, then the synthesis can be performed, but hazardous reagents like NaH/DMF are required
Solution Approach 1:
The patent replaces hazardous reagents with safer, more environmentally friendly alternatives: NaH/DMF is replaced with K2CO3/DMF or K2CO3/MeOH, and phosphorus oxychloride is replaced with sulfur trioxide-trimethylsulfonium salt, maintaining synthesis feasibility while eliminating safety hazards
Solution Approach 2:
The patent converts potentially harmful reactions into beneficial ones by using milder reagents that reduce side reactions and improve product purity, such as using K2CO3 which provides better selectivity and reduces hazardous waste
3Ease of manufacture
If the existing synthetic route is used, then the compounds can be synthesized, but several column chromatography purification steps are required
Solution Approach 1:
The patent extracts and eliminates the need for complex column chromatography purification steps by optimizing reactions to produce cleaner products that can be purified by simpler methods such as filtration, crystallization, or single-step chromatography
Solution Approach 2:
The patent designs reactions that self-purify to some extent through selective precipitation or crystallization of the desired product, reducing or eliminating the need for laborious column chromatography 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 process achieves high yields and purity of quinazoline compounds on a multikilogram scale, eliminating the use of hazardous reagents and simplifying the purification steps, making it suitable for pharmaceutical production.
Implementation Method 1
reacting a compound of Formula (II) with a compound of Formula (III)
Implementation Method 2
SNAr attacks with alkanolamine
Implementation Method 3
chlorination
Implementation Method 4
urea bond formation
Implementation Method 5
The compound of Formula (I) is recrystallized from solvents
Implementation Method 6
the liquid-liquid extraction is conducted by adding ETOAc to the mixture and collecting the compound of Formula (VI) therein
Data Source
AI summary
The present invention discloses a process for preparing compounds of Formula (I), particularly, a process manufacturing thereof on a multikilogram scale:wherein B, D, W, Z, R1, R2, and n are defined herein.