Solution Phase Etelcalcetide Synthesis

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Solution Overview

Problem

Traditional solid-phase synthesis methods for etelcalcetide are costly, time-consuming, and require extensive chromatographic purification, limiting scalability and chiral purity.

Innovation Solution

Solution-phase methods involving fragment coupling to form the main heptapeptide chain of etelcalcetide, followed by introduction of the L-cysteine side chain via disulfide bridge formation, allowing for crystallization-based purification and easier scale-up.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If solid-phase synthesis is used to prepare etelcalcetide, then the synthesis can be performed with standardized protocols, but the raw material costs increase and purification becomes time-consuming

Engineering Contradiction:

Improvesynthesis protocol standardizationVSAvoidpurification time

Core Design Contradiction:

Ease of manufactureVSLoss of time

Solution Approach 1:

The patent changes the phase parameter from solid-phase to solution-phase synthesis, which fundamentally alters the purification mechanism from chromatographic separation to crystallization-based purification, thereby reducing purification time while maintaining manufacturing feasibility

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention utilizes phase transition from solution to solid crystal form during purification. The peptide forms crystalline precipitates that can be easily separated by filtration, replacing the time-consuming chromatographic purification steps required in solid-phase synthesis

Inventive Principle:

Principle #36Phase transitions

2Ease of manufacture

If solid-phase synthesis is used to prepare etelcalcetide, then the synthesis can be performed with standardized protocols, but raw material costs increase

Engineering Contradiction:

Improvesynthesis protocol standardizationVSAvoidraw material cost

Core Design Contradiction:

Ease of manufactureVSQuantity of substance

Solution Approach 1:

The patent changes the synthesis phase from solid to solution, which enables the use of less expensive reagents and simplifies the overall manufacturing process, thereby reducing raw material costs while maintaining ease of manufacture through standardized solution-phase protocols

Inventive Principle:

Principle #35Parameter changes

3Manufacturing precision

If conventional purification methods are used, then the peptide can be purified effectively, but the process becomes time-consuming and complex

Engineering Contradiction:

Improvepeptide purification effectivenessVSAvoidpurification process complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The invention exploits the phase transition of the peptide from dissolved state to crystalline precipitate. This natural phase separation provides effective purification through simple filtration, dramatically reducing process complexity while maintaining high purification effectiveness

Inventive Principle:

Principle #36Phase transitions

Solution Approach 2:

The patent extracts the peptide from the complex reaction mixture by inducing crystallization. The pure crystalline peptide separates from impurities in the solution phase, enabling simple filtration-based purification instead of complex chromatographic methods

Inventive Principle:

Principle #2Taking out (Extraction)

4Ease of manufacture

If solid-phase synthesis is used, then the synthesis can be performed on resin support, but scalability to commercial production is limited

Engineering Contradiction:

Improveresin support synthesisVSAvoidcommercial scale-up capability

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The patent changes the synthesis phase from solid to solution, which enables scaling to commercial production. Solution-phase chemistry allows for larger reaction volumes and easier process engineering compared to solid-phase methods, directly improving productivity and commercial scalability

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

This approach reduces raw material costs, simplifies purification, enhances chiral purity, and facilitates commercial scale-up while maintaining high efficiency in producing etelcalcetide and its pharmaceutically acceptable salts.

Implementation Method 1

coupling in solution phase a protected N-terminal tetrapeptide fragment of etelcalcetide with a protected tripeptide fragment to form a protected heptapeptide precursor

Methodology Applied

Scientific EffectAmide bond formation: Chemical Bonding