CDK4/6 Inhibitor Synthesis Without Column Chromatography
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Solution Overview
Problem
Existing methods for preparing the CDK4/6 inhibitor of formula (I) are not suitable for industrial production due to the use of oily intermediates requiring silica gel column chromatography, metal catalysts, and long reaction times, making them costly and complex.
Innovation Solution
A new method involving cost-effective reagents and simple operations that eliminate the need for silica gel column chromatography, using a series of reactions with specific solvents, bases, and catalysts to produce high-yield and pure intermediates, including steps like methylation and boronation, to ultimately prepare the compound of formula (I), which are suitable for industrial production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the existing preparation method is used, then the compound of formula (I) can be synthesized, but the process requires silica gel column chromatography for purification of multiple oily intermediates, making it unsuitable for industrial production
Solution Approach 1:
The patent changes the chemical structure parameters of intermediates by introducing specific functional groups and protecting groups that enable crystalline forms to be obtained instead of oils. This structural modification allows the intermediates to be purified by simple filtration and washing operations, eliminating the need for silica gel column chromatography and making the process suitable for industrial production.
2Productivity
If metal catalysts are used in the preparation process, then the reactions can proceed efficiently, but the process cost increases and post-treatment becomes complex
Solution Approach 1:
The patent extracts and removes the metal catalyst requirement from the synthesis process by using alternative reagents and reaction conditions that do not require metal catalysis. This eliminates the associated costs and complex post-treatment steps for metal removal while maintaining reaction efficiency through carefully selected reagents and optimized reaction parameters.
3Manufacturing precision
If compound (8) with multiple N atoms is reduced, then the target structure is achieved, but the reaction time becomes too long for industrial production
Solution Approach 1:
The patent performs preliminary modifications on the nitrogen-containing compound before the reduction step, including introducing activating groups or modifying the molecular structure to facilitate faster reduction. This preliminary action prepares the molecule for more efficient reduction, significantly shortening the reaction time required to achieve the target structure while maintaining manufacturing precision.
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 method provides a cost-effective and efficient method for preparing the compound of formula (I), which is suitable for industrial production.
Implementation Method 1
reacting compound SMA-1 with compound SMA-8 to give compound SMA-2
Implementation Method 2
reacting compound SMA-2 with hydrazine hydrate to give compound SMA-3
Implementation Method 3
subjecting compound SMA-3 to a methylation reaction to give compound SMA-4
Implementation Method 4
reacting compound SMA-4 with bis(pinacolato)diboron to give compound SMA-5
Implementation Method 5
reacting compound SMA-5 with compound SMA-9 to give compound SMA-6
Implementation Method 6
reacting compound SMA-6 with compound SMA-10 to give compound SMA-7
Data Source
AI summary
A preparation method for a CDK4/6 inhibitor for a compound of formula (I):5-fluoro-4-(3-isopropyl-2-methyl-2H-indazol-5-yl)-N-(5-(piperazin-1-yl) pyrazol-2-yl)pyrimidine-2-amine. The preparation method has cheap and readily available starting materials and reagents, greatly simplified total reaction steps, shortened reaction time, improved total yield and a high purity of the key intermediate and final product, being suitable for industrial production.