DM-Bsmoc Amino Protecting Group for Peptide Synthesis
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Solution Overview
Problem
Current amino protecting groups, such as Fmoc, face challenges in deblocking and aggregation during peptide synthesis, particularly in solid-phase methodologies, and many Bsmoc-protected amino acids are obtained as oils or amorphous materials, making them inconvenient for commercial use.
Innovation Solution
The introduction of the 5,6-dimethoxy-1,1-dioxobenzo[b]thiophene-2-methyloxycarbonyl (DM-Bsmoc) group, which can be introduced via chloroformate or N-succimidyl ester, provides enhanced deblocking ease, water solubility, and stability, allowing for the formation of stable solid amino acid derivatives, facilitating peptide synthesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Fmoc protecting group is used for amino acid protection, then amino acid can be protected for peptide synthesis, but deblocking becomes difficult and aggregation occurs during synthesis
Solution Approach 1:
The patent modifies the Fmoc protecting group by introducing a sulfone moiety at the 5-position of the fluorene ring system. This structural parameter change (adding electron-withdrawing sulfone group) alters the electronic properties and steric characteristics of the protecting group, enabling easier deblocking while reducing aggregation tendencies during solid-phase peptide synthesis
2Productivity
If Bsmoc-protected amino acids are used, then peptide synthesis can proceed, but the amino acids are obtained as oils or amorphous materials making them inconvenient for commercial use
Solution Approach 1:
The patent combines the Bsmoc protecting group structure with a sulfone substituent to create a composite molecular structure (5-sulfone-Bsmoc). This composite structure integrates the beneficial deblocking properties of Bsmoc with the crystallization-promoting effects of the sulfone group, resulting in amino acid derivatives that form stable solids suitable for commercial manufacturing
Solution Approach 2:
The sulfone group is strategically placed at the 5-position of the benzo[b]thiophene ring system, creating a localized functional region that influences the overall molecular packing and intermolecular interactions. This local structural modification specifically addresses the physical state issue without compromising the protecting group's functionality
3Productivity
If conventional protecting groups are used, then peptide synthesis can be performed, but solvent use increases and environmental sustainability is reduced
Solution Approach 1:
The introduction of the sulfone group creates a more polar protecting group structure that enhances water solubility of the amino acid derivatives. This parameter change (increased polarity and water solubility) allows for reduced organic solvent consumption during peptide synthesis operations while maintaining synthesis efficiency
Data Source
AI summary
Amino acid protecting groups are provided for use in peptide synthesis. Particular compounds disclosed include 5,6-dimethoxy-1,1-dioxobenzo[b]thiophi methyloxycarbonyl (DM-Bsmoc) and related amino-protecting groups.