Multi-Step Synthesis of Cyclic Dinucleotide Intermediates for STING Agonists
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for preparing cyclic dinucleotides, which act as STING agonists, are inefficient and lack specificity, hindering their potential in cancer treatment applications.
Innovation Solution
A multi-step process involving benzoyl protection, oxidation, reductive amination, and deprotection reactions using specific reagents and conditions to synthesize intermediate compounds like Compound 8, 15, and 22, allowing for the production of novel intermediate compounds and their salts with varying protecting groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If current methods are used for preparing cyclic dinucleotides, then the synthesis process is simpler, but the efficiency and specificity are insufficient
Solution Approach 1:
The synthesis process is divided into multiple discrete steps including benzoyl protection, oxidation, reductive amination, and deprotection reactions. Each step is optimized independently with specific reagents and conditions, allowing for precise control and high specificity while maintaining overall productivity through systematic progression.
Solution Approach 2:
Protecting groups (benzoyl and benzyl) are introduced in advance to prevent unwanted side reactions during subsequent synthesis steps. These preliminary protective actions ensure that only the desired transformations occur at each stage, significantly improving synthesis efficiency and specificity by eliminating competing reactions.
2Manufacturing precision
If current methods are used for preparing cyclic dinucleotides, then fewer reaction steps are required, but the specificity of synthesis is lacking
Solution Approach 1:
Different protecting groups (benzoyl for hydroxyl groups, benzyl for amine groups) are selectively applied to specific functional groups at precise locations in the molecule. This local differentiation allows each functional group to be controlled independently, achieving high synthesis specificity through targeted protection and deprotection sequences.
Solution Approach 2:
Protecting groups serve as intermediaries that temporarily modify functional groups to enable selective reactions. The benzoyl and benzyl protecting groups mediate the synthesis by preventing unwanted reactions during intermediate stages, then are selectively removed to reveal the desired product with high specificity.
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 enhances the efficiency and specificity of cyclic dinucleotide synthesis, enabling their effective use in combination with anticancer agents for treating various cancer types.
Implementation Method 1
reacting Compound 1 in a benzoyl protection reaction to afford Compound 2
Implementation Method 2
reacting Compound 2 in an oxidation reaction to afford Compound 3
Implementation Method 3
reacted in a reductive amination to afford Compound 4
Implementation Method 4
Compound 4 is reacted in a protection step using a benzyl protecting agent and base in a solvent at a temperature of about 70° C. to afford Compound 5
Implementation Method 5
reacted in a deprotection step with an acid in a common organic solvent to afford Compounds 6 and 7
Implementation Method 6
reacting Compounds 6 and 7 with a benzoyl protecting reagent and a base in an organic solvent to afford Compound 8
Implementation Method 7
reacting Compound 8 using Vorbrüggen chemistry to afford Compound 9
Implementation Method 8
Compound 13 is then reacted with ammonia to afford Compound 14
Implementation Method 9
which is subsequently hydrogenated to afford intermediate Compound 15 or Compound 15a
Data Source
AI summary
The invention generally relates to improved processes for the preparation of intermediates of a cyclic dinucleotide which is useful as a STING agonist.