Sulfonic Acid Crosslinker Synthesis via One-Pot Sulfonation
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Solution Overview
Problem
Current methods for preparing sulfonic acid-bearing crosslinkers, such as sulfo-SPDB, are inefficient and lengthy, requiring multiple chemical steps, which hinders the scalable production of charged crosslinkers that enhance the aqueous solubility and therapeutic activity of antibody-drug conjugates.
Innovation Solution
A simplified process for preparing sulfonic acid-bearing heterobifunctional linkers, including sulfo-SPDB, involving direct sulfonation of 4-(2-pyridyldithio)butanoic acid with chlorosulfonic acid in the presence of a base, followed by reaction with N-hydroxysuccinimide, to produce a crosslinker that improves the solubility and therapeutic efficacy of antibody-drug conjugates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the traditional multi-step synthesis process is used to prepare sulfonic acid-bearing crosslinkers, then the product can be obtained with adequate purity, but the process is lengthy and inefficient requiring multiple chemical steps
Solution Approach 1:
The patent combines multiple separate chemical steps into a single one-pot reaction by adding chlorosulfonic acid, base, and N-hydroxysuccinimide simultaneously to the substrate. This merging of operations eliminates intermediate isolation steps and reduces the overall synthesis time while maintaining product purity, directly resolving the contradiction between productivity and time consumption.
Solution Approach 2:
The patent performs preliminary preparation of the reaction mixture by combining all reagents (substrate, chlorosulfonic acid, base, and N-hydroxysuccinimide) before initiating the reaction. This preliminary action ensures that all components are in place and properly mixed before the sulfonation occurs, streamlining the process and eliminating the need for sequential addition steps, thereby improving productivity without sacrificing product quality.
2Ease of manufacture
If charged crosslinkers with sulfonic acid groups are used to improve aqueous solubility of antibody-drug conjugates, then solubility and therapeutic activity are enhanced, but the synthesis process becomes more complex
Solution Approach 1:
The patent merges the sulfonation reaction and the N-hydroxysuccinimide ester formation into a single one-pot operation. By combining these two transformations that would traditionally require separate steps, the patent simplifies the manufacturing process for producing charged crosslinkers, making them easier to manufacture at scale while maintaining the desired sulfonic acid functionality for improved solubility.
Solution Approach 2:
The patent optimizes reaction parameters such as the sequence of addition, temperature control, and stoichiometry of reagents to facilitate the one-pot synthesis. By carefully controlling these parameters, the patent achieves high yields and purity of the charged crosslinker without requiring complex purification steps, thereby improving ease of manufacture while managing process complexity.
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 new process significantly reduces the complexity and time required for producing sulfonic acid-bearing crosslinkers, enabling improved aqueous solubility and therapeutic activity of antibody-drug conjugates, particularly against multidrug-resistant cells.
Implementation Method 1
direct sulfonation of 4-(2-pyridyldithio)butanoic acid with chlorosulfonic acid
Implementation Method 2
in the presence of a base
Implementation Method 3
followed by reaction with N-hydroxysuccinimide
Data Source
AI summary
Processes for the preparation of charged crosslinkers bearing a sulfonic acid moiety are disclosed. These procedures also optionally include methods to convert the resulting products to substantially a single salt form.