Sunitinib Preparation via Carbonyl Diimidazole Activation

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Solution Overview

Problem

Current methods for preparing sunitinib and its salts face challenges such as the use of hazardous reagents like thionyl chloride and hygroscopic carbonyl diimidazole, which are not environmentally friendly and require anhydrous conditions, limiting their industrial scalability and efficiency.

Innovation Solution

A novel process involving the reaction of 5-((Z)-(5-fluoro-2-oxoindolin-3-ylidene) methyl)-2,4-dimethyl-1H-pyrrole-3-carboxylic acid with a suitable activating group, followed by amidation with N,N-diethyl ethylene diamine, using sulfonylating agents like p-toluene sulfonyl chloride, to obtain sunitinib and its acid addition salts, enhancing solubility and stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If thionyl chloride is used to activate carboxylic acid, then the activation efficiency is improved, but the process generates hazardous toxic gases and is not environmentally friendly

Engineering Contradiction:

Improveactivation efficiencyVSAvoidtoxic gases

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent replaces hazardous thionyl chloride with carbonyl diimidazole, which activates carboxylic acid to form mixed anhydride intermediates that are less harmful. The reaction produces imidazole byproduct instead of toxic gases, converting a harmful activation method into a safer one while maintaining efficiency

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent introduces carbonyl diimidazole as an intermediary activating agent that mediates between carboxylic acid and amine reactants. This intermediary forms a reactive mixed anhydride species that facilitates amide bond formation without requiring harsh conditions or generating toxic byproducts

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If carbonyl diimidazole is used as activating agent, then the environmental friendliness is improved, but the reagent is hygroscopic and requires anhydrous conditions

Engineering Contradiction:

Improveenvironmental friendlinessVSAvoidoperation complexity

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

The patent modifies the reaction parameters by conducting the activation and amidation steps in aprotic solvents like DMF or DCM under anhydrous conditions. This parameter change allows carbonyl diimidazole to function effectively without hygroscopic interference, maintaining its environmental benefits while controlling operational complexity through standardized anhydrous techniques

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If traditional activation methods are used, then the process is simpler, but the yield and purity of sunitinib are reduced

Engineering Contradiction:

Improveprocess complexityVSAvoidpurity

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The patent applies preliminary activation of carboxylic acid with carbonyl diimidazole to form a highly reactive mixed anhydride intermediate before adding the amine. This preliminary action ensures complete and selective amide bond formation, achieving high purity sunitinib product while maintaining reasonable process complexity through sequential addition

Inventive Principle:

Principle #10Preliminary action

4Device complexity

If traditional activation methods are used, then the process is simpler, but the yield of sunitinib is reduced

Engineering Contradiction:

Improveprocess complexityVSAvoidyield

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The patent uses carbonyl diimidazole as an intermediary that mediates the activation of carboxylic acid, creating a highly reactive mixed anhydride species. This intermediary enables efficient nucleophilic attack by the amine, significantly improving sunitinib yield compared to direct coupling methods, while the two-step process remains manageable in complexity

Inventive Principle:

Principle #24Intermediary (Mediator)

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

This process improves the yield, safety, and purity of sunitinib, offering better handling, increased solubility, and stability, making it more suitable for industrial-scale production and pharmaceutical applications.

Implementation Method 1

reacting 5-((Z)-(5-fluoro-2-oxoindolin-3-ylidene) methyl)-2,4-dimethyl-1H-pyrrole-3-carboxylic acid with a suitable activating group, followed by amidation with N,N-diethyl ethylene diamine

Methodology Applied

Scientific EffectChemical activation: Chemical Bonding

Data Source

PatentEP2828251B1An improved process for the preparation of sunitinib and its acid addition salts thereof

Publication Date: 2018.10.31 LAURUS LABS

Figure 1

AI summary

The present invention relates to an improved process for the preparation of Sunitinb. The process involves the activation of 5-((Z)-(5-fluoro-2-oxoindolin-3-ylidene) methyl)-2,4-dimethyl-1 H-pyrrole-3carboxylic acid to corresponding suitable carboxylic acid activating group. The present invention also relates to novel acid addition salts of Sunitinb and preparation thereof.