Cocrystal Melting Point Elevation for API Processing

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Solution Overview

Problem

The substituted 2-oxo-1-pyrrolidinyl triazole compound of formula (I) has a low melting point, making particle-size reduction and formulation challenging, and it does not form simple salts due to non-protonatable nitrogen atoms, limiting the development of stable pharmaceutical forms for cognitive impairment treatment.

Innovation Solution

Formation of cocrystals with a carboxylic acid coformer, such as those of formula (II), which enhances the melting point, stability, and processing properties, including non-hygroscopicity and high purity, facilitating particle size reduction and downstream processing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If the substituted 2-oxo-1-pyrrolidinyl triazole compound is used in its pure form, then the compound maintains its chemical integrity, but the low melting point (approximately 85°C) makes particle-size reduction and formulation challenging

Engineering Contradiction:

Improvemelting pointVSAvoidparticle-size reduction and formulation

Core Design Contradiction:

TemperatureVSEase of manufacture

Solution Approach 1:

The patent forms a cocrystal composite material by combining the substituted 2-oxo-1-pyrrolidinyl triazole compound with a carboxylic acid coformer. This composite cocrystal structure raises the melting point to over 25°C higher than the pure API, thereby improving particle-size reduction capability and downstream processing while maintaining chemical integrity through the stable crystalline lattice.

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If simple salt formation is attempted with the substituted 2-oxo-1-pyrrolidinyl triazole compound, then the option of forming a crystalline salt is available, but the nitrogen atoms are not easily protonated, making salt formation not available

Engineering Contradiction:

Improvesalt formationVSAvoidprotonation of nitrogen atoms

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent uses a carboxylic acid coformer as an intermediary to achieve crystalline salt-like stability without requiring protonation of the nitrogen atoms. The cocrystal formation creates a stable crystalline lattice through non-covalent interactions between the API and coformer, providing the benefits of crystalline salts without the need for traditional acid-base salt formation.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of manufacture

If the substituted 2-oxo-1-pyrrolidinyl triazole compound is formulated as a cocrystal with a carboxylic acid coformer, then the melting point increases and processing properties improve, but the identification of suitable coformers becomes challenging

Engineering Contradiction:

Improveprocessing propertiesVSAvoidcoformer identification process

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The patent employs systematic parameter changes in the coformer selection process, focusing on carboxylic acids with specific structural parameters (formula II with varying n values and L groups). This structured approach to parameter variation enables identification of suitable coformers that optimize melting point and processing properties while maintaining crystalline stability.

Inventive Principle:

Principle #35Parameter changes

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 cocrystals exhibit improved melting points, stability, and processing characteristics, enabling more effective formulation and storage of the substituted 2-oxo-1-pyrrolidinyl triazole compound for pharmaceutical applications, particularly in treating cognitive disorders.

Implementation Method 1

The present invention provides cocrystals of the substituted 2-oxo-1-pyrrolidinyl triazole compound of formula (I) with improved physical properties compared to the pure compound

Methodology Applied

Scientific EffectCocrystal formation: Crystallisation

Implementation Method 2

the cocrystals of the present invention have a higher melting point than that of the pure API. Indeed, particular cocrystals of the invention exhibit melting points over 25° C. higher than that of the API

Methodology Applied

Scientific EffectMelting point elevation: Melting