GSC Synthesis via Segmented 14-Step Protection Strategy
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Solution Overview
Problem
Current methods for synthesizing cytidine-5′-monophospho-N-glycyl-sialic acid (GSC) are inefficient and lack a comprehensive, reliable process for producing high yields.
Innovation Solution
A 14-step process involving benzylation, acetylation, thiophenol introduction, Boc protection, deacetylation, Boc deprotection, TFA-Gly introduction, thiophenol removal, phosphite introduction, oxidation, debenzylation, triacetyl-cytidine coupling, and acetyl and trifluoroacetamide deprotection reactions is developed to synthesize GSC from N-Acetylneuraminic acid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If current synthesis methods are used, then the synthesis process can be completed, but the yield and efficiency are insufficient
Solution Approach 1:
The synthesis process is divided into 14 distinct steps including benzylation, acetylation, thiophenol introduction, Boc protection, deacetylation, Boc deprotection, TFA-Gly introduction, thiophenol removal, phosphite introduction, oxidation, debenzylation, triacetyl-cytidine coupling, and acetyl and trifluoroacetamide deprotection. This segmentation allows each reaction to be optimized and controlled independently, improving both yield and efficiency
Solution Approach 2:
Protecting groups (benzyl, acetyl, Boc) are introduced in advance to prevent unwanted side reactions during intermediate steps. These preliminary protective actions ensure that sensitive functional groups remain intact until the appropriate stage, thereby improving overall synthesis reliability and yield
2Reliability
If a comprehensive synthesis process is developed, then high yields can be achieved, but the process complexity increases
Solution Approach 1:
Different reaction conditions (temperature, solvent, catalysts, pH) are optimized for each of the 14 synthesis steps. By carefully controlling parameters such as using cesium carbonate for benzylation, specific acetylation conditions, and controlled oxidation conditions, high yields are achieved while managing process complexity through systematic parameter optimization
Solution Approach 2:
Multiple intermediate compounds are formed with specific protecting groups (benzyl, acetyl, Boc) that facilitate subsequent reactions. These intermediates act as mediators that enable the complex synthesis to proceed through manageable stages, with each intermediate designed to enable the next transformation while protecting sensitive functionality
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 process provides a systematic and effective method for producing GSC, enhancing yield and efficiency by breaking down the synthesis into specific, controlled chemical reactions.
Implementation Method 1
Benzylation of N-Acetylneuraminic acid
Implementation Method 2
Cesium Carbonate
Implementation Method 3
Acetylation of Intermediate 1
Implementation Method 4
Boron trifluoride diethyl etherate
Implementation Method 5
Boc Protection of Intermediate 3
Implementation Method 6
Decetylation of intermediate 4
Implementation Method 7
Acetylation of Intermediate 5
Implementation Method 8
Oxidation of Intermediate 10
Implementation Method 9
Debenzylation of Intermediate 11
Data Source
AI summary
Aspects of the present disclosure provide methods for the chemical synthesis of cytidine-5′-monophospho-N-glycyl-sialic acid (GSC).