Cyclic Dinucleotide Synthesis via Protected Intermediates
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Solution Overview
Problem
Existing methods for preparing cyclic dinucleotides, such as Compound I, are lengthy and require hazardous reagents, lacking diastereoselectivity and resulting in lower yields and quality.
Innovation Solution
A multi-step process involving specific reactions with compounds like TBSCl, Et3N, imidazole, DBU, and potassium t-butoxide in solvents like DMF and THF, followed by quenching with acids, to synthesize Compound I with improved diastereoselectivity and reduced hazardous reagent usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If existing methods are used to prepare cyclic dinucleotides, then the synthesis can be completed, but the process is lengthy and requires hazardous reagents
Solution Approach 1:
The patent changes the chemical parameters of the synthesis process by using specific protecting groups (Bz for amine, TBS for alcohol) and controlled reaction conditions to reduce the number of steps and eliminate hazardous reagents while maintaining synthesis completeness
Solution Approach 2:
The patent extracts and removes hazardous reagents from the synthesis process by replacing them with safer alternatives that achieve the same chemical transformations, thereby eliminating harmful factors while maintaining product quality
2Manufacturing precision
If existing methods are used to prepare cyclic dinucleotides, then the synthesis can be completed, but the process lacks diastereoselectivity resulting in lower yield and quality
Solution Approach 1:
The patent applies local quality by introducing specific chiral protecting groups and reagents that provide diastereoselectivity at specific positions in the molecule, ensuring high precision in the formation of specific stereoisomers while improving overall yield
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 process significantly reduces synthesis length, minimizes the use of hazardous reagents, and achieves high diastereoselectivity, resulting in improved yield and quality of Compound I.
Implementation Method 1
reacting Compound 1 in DMF with TBSCl and Et3N to afford Compound 2
Implementation Method 2
reacting Compound 2 with a base such as imidazole, DBU, diisopropylethylamine, triazole, tetrazole or metal alkoxide bases in a solvent such as THF, 2-MeTHF, MeCN or DMF, and then with Compound A to afford Compound 3
Implementation Method 3
adding a base such as potassium t-butoxide, DBU or other metal allkoxide bases, followed by quenching with an appropriate acid such as acetic acid to afford Compound 4
Implementation Method 4
followed by quenching with an appropriate acid such as acetic acid to afford Compound 4
Implementation Method 5
treating a solution of compound 5 in a solvent such as THE, MeTHE, or MeCN, with an acid such as TFA, MSA, p-TSA or utilizing a fluoride deprotection, to afford Compound 6
Data Source
AI summary
The invention generally relates to an improved processes for the preparation of a cyclic dinucleotide which is useful as a STING agonist.