Solid-Phase Etelcalcetide Synthesis via Disulfide Bond Formation
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Solution Overview
Problem
Current methods for synthesizing Etelcalcetide are cumbersome, requiring multi-step purification and resulting in low yields and high production costs due to the complexity of constructing intermolecular disulfide bonds.
Innovation Solution
A solid-phase synthesis method is employed, where a peptide resin is synthesized, and the sulfhydryl group of D-Cys is activated with 2,2'-dithiodipyridine to form a disulfide bond with L-Cys, bypassing the need for multiple purification steps, thereby increasing yield and purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional intermolecular disulfide bond construction method is used, then disulfide bonds can be formed, but the process requires multi-step purification and preparation, resulting in low total yield and high production cost
Solution Approach 1:
The invention combines the disulfide bond formation step with the solid-phase peptide synthesis process. The sulfhydryl group activation and disulfide bond construction are performed while the peptide remains attached to the solid support, eliminating the need for separate purification steps between these operations. This merging of steps directly addresses the low productivity issue by reducing the number of isolation and purification cycles required.
Solution Approach 2:
The invention performs preliminary protection of the sulfhydryl group during the solid-phase synthesis process. The side chain protecting groups are strategically removed and activated in advance, allowing the disulfide bond to form before final cleavage from the resin. This preliminary action ensures that the disulfide bond construction is integrated into the synthesis workflow rather than being a separate post-synthesis step.
2Reliability
If conventional intermolecular disulfide bond construction method is used, then disulfide bonds can be formed, but multiple purification steps are required, resulting in high production cost
Solution Approach 1:
The invention merges the disulfide bond formation with the solid-phase synthesis process, eliminating multiple intermediate purification steps. By performing the sulfhydryl activation and disulfide bond construction while the peptide is still on the resin, the method reduces the number of isolation and purification operations required, thereby lowering production costs while maintaining reliable disulfide bond formation.
Solution Approach 2:
The solid support serves a dual function: it acts as both the synthesis platform and the purification medium. The resin allows for easy washing and removal of excess reagents and byproducts through simple filtration, eliminating the need for complex liquid-liquid extraction or column chromatography steps. This self-service capability of the solid support significantly reduces manufacturing complexity and cost.
3Reliability
If conventional intermolecular disulfide bond construction method is used, then disulfide bonds can be formed, but multi-step purification is required, resulting in tedious reaction steps
Solution Approach 1:
The invention combines multiple operations into a single integrated process: solid-phase peptide synthesis, side chain deprotection, sulfhydryl activation, and disulfide bond formation are all performed in sequence while the peptide remains attached to the resin. This merging eliminates the need for intermediate isolation and purification steps, dramatically simplifying the overall reaction protocol while ensuring reliable disulfide bond construction.
Solution Approach 2:
The invention performs preliminary removal of side chain protecting groups and activation of sulfhydryl groups during the solid-phase synthesis process. By preparing the peptide with free or activated sulfhydryl groups before cleavage from the resin, the method ensures that disulfide bond formation can occur in a single step immediately following resin cleavage, rather than requiring multiple separate preparation and reaction steps.
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 method achieves a crude peptide purity of 80-90% and a yield of above 95%, with refined peptide purity exceeding 98% and total yield of 45-60%, significantly improving the efficiency and cost-effectiveness of Etelcalcetide production.
Implementation Method 1
activating the sulfhydryl group of the side chain of D-Cys in the peptide resin of fragment B with 2,2'-dithiodipyridine to obtain a peptide resin of fragment C; and coupling L-Cys coupled with a protecting group at the N-terminus thereof to the peptide resin of fragment C in a coupling system to construct a disulfide bond
Data Source
AI summary
Provided is a method for solid phase synthesis of Etelcalcetide, comprising synthesizing Etelcalcetide backbone peptide resin, removing the side chain protecting group of Cys in the peptide chain, and then activating the sulfydryl group of the Cys side chain on the peptide resin with 2,2'-dithiodipyridine and constructing a disulfide bond with L-Cys, such that a crude Etelcalcetide peptide is obtained by cleaving. The method does not require undergoing multi-step purification, the yield and purity of the obtained crude peptide are relatively high, and the total yield of the refined peptide after purification is greatly increased.