Linagliptin Intermediate Impurity Synthesis and Purification

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Solution Overview

Problem

Current synthesis methods for linagliptin intermediate 2-(chloromethyl)-4-methylquinazoline involve highly toxic materials, leading to safety concerns, high costs, and low yields, while existing impurity detection methods are not sensitive enough for quality control.

Innovation Solution

A new impurity compound, 4,4′-(2-methylpropane-1,3-diyl)bis(2-(chloromethyl)quinazoline), is synthesized by reacting 2-(chloromethyl)-4-methylquinazoline with acetaldehyde under alkaline conditions, followed by purification using a silica gel column and methyl tert-butyl ether, providing a high-purity reference for quality analysis.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If highly toxic materials (phosphorus trichloride and phosphorus oxychloride) are used in synthesis, then the synthesis route is established, but safety concerns arise and production cost increases

Engineering Contradiction:

Improvesynthesis route establishmentVSAvoidsafety concerns

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent replaces expensive and highly toxic phosphorus-based reagents with cheaper, less hazardous alternatives. The new method uses readily available starting materials and milder reaction conditions, eliminating the need for specialized safety equipment and disposal procedures while maintaining product quality

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent converts the harmful toxic byproducts of phosphorus-based synthesis into a beneficial outcome by using alternative reagents that produce environmentally friendly waste products. The new synthesis route transforms a hazardous process into a safer, more sustainable manufacturing method

Inventive Principle:

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

2Ease of manufacture

If highly toxic materials (phosphorus trichloride and phosphorus oxychloride) are used in synthesis, then the synthesis route is established, but production cost increases

Engineering Contradiction:

Improvesynthesis route establishmentVSAvoidproduction cost

Core Design Contradiction:

Ease of manufactureVSQuantity of substance

Solution Approach 1:

The patent employs inexpensive, commercially available reagents and starting materials that eliminate the need for costly phosphorus-based chemicals. The simplified procedure reduces equipment requirements and operational expenses, making the synthesis economically viable for large-scale production

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Ease of manufacture

If highly toxic materials are used in synthesis, then the synthesis route is established, but yield of synthetic products decreases

Engineering Contradiction:

Improvesynthesis route establishmentVSAvoidyield of synthetic products

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The patent optimizes reaction parameters including temperature, solvent selection, and reaction time to maximize product yield. The new method employs controlled reaction conditions that prevent side reactions and material degradation, achieving higher conversion rates and product recovery compared to the phosphorus-based approach

Inventive Principle:

Principle #35Parameter changes

4Reliability

If existing impurity detection methods are used, then quality control is performed, but sensitivity is insufficient

Engineering Contradiction:

Improvequality controlVSAvoiddetection sensitivity

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent replaces conventional, less sensitive detection methods with high-performance liquid chromatography (HPLC) coupled with mass spectrometry or other advanced analytical techniques. This substitution enables detection of impurities at much lower concentrations, providing superior sensitivity and accuracy for quality control

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 method is simple, efficient, and suitable for industrial production, enhancing the quality and safety of linagliptin bulk drug through precise impurity analysis and control.

Implementation Method 1

reacting 2-(chloromethyl)-4-methylquinazoline with acetaldehyde under alkaline conditions

Methodology Applied

Scientific EffectCondensation reaction: Chemical Bonding

Implementation Method 2

purification using a silica gel column

Methodology Applied

Scientific EffectAdsorption chromatography: Adsorption

Data Source

PatentUS12122754B2Related substance of linagliptin intermediate and synthesis method thereof

Publication Date: 2024.10.22 WISDOM PHARMACEUTICAL CO LTD

AI summary

A related substance of linagliptin intermediate 2-(chloromethyl)-4-methylquinazoline, 4,4′-(2-methylpropane-1,3-diyl)bis(2-(chloromethyl)quinazoline) and a method for synthesizing the related substance (impurity) by reacting 2-(chloromethyl)-4-methylquinazoline with acetaldehyde under an alkaline condition and a purification method are provided. The preparation method is simple and convenient to operate, short in reaction time, high in product purity, and high in yield. The synthesized related substance can be used for qualitative and quantitative analysis of the linagliptin intermediate 2-(chloromethyl)-4-methylquinazoline and API impurities of linagliptin, so that the medication safety of the linagliptin is improved.