Sofosbuvir Synthesis via Segmented Intermediates
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Solution Overview
Problem
Current methods for synthesizing sofosbuvir, an HCV NS5B polymerase inhibitor, face inefficiencies and impurities in the production process, necessitating the development of novel intermediates and synthetic pathways for improved yield and purity.
Innovation Solution
A novel process for synthesizing sofosbuvir involves converting compound 17 to 16, followed by oxidation to 15, fluorination to 14, hydrolysis to 13, protection of hydroxyl groups to 12, and subsequent conversion to 9, using specific reagents and conditions such as thionyl chloride, sodium hypochlorite, hydrogen fluoride, and hydroxy protecting groups, ultimately leading to high yield and enantiomeric purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods are used for synthesizing sofosbuvir, then the synthesis process is simpler, but the yield and purity are lower
Solution Approach 1:
The synthesis process is divided into multiple discrete steps with specific intermediates (compound 17 → 16 → 15 → 14 → 13 → 12 → 9 → sofosbuvir). Each step is optimized independently to achieve high overall purity, with protecting groups and selective reagents used at each stage to prevent side reactions and maintain enantiomeric integrity.
Solution Approach 2:
Multiple intermediate compounds (17, 16, 15, 14, 13, 12, 9) are employed as mediators in the synthesis pathway. Each intermediate serves as a controlled transition state that allows for selective transformations and purification steps, ultimately leading to high purity sofosbuvir with >98% enantiomeric excess.
2Productivity
If conventional methods are used for synthesizing sofosbuvir, then fewer reagents are needed, but the yield is lower
Solution Approach 1:
The synthesis employs specific reagents and conditions at each step to optimize yield: thionyl chloride for conversion to compound 16, sodium hypochlorite for oxidation to 15, hydrogen fluoride for fluorination to 14, and various protecting groups for compounds 12 and 9. These parameter changes at each stage cumulative to achieve >90% 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 achieves high yield and chemical and enantiomeric purity of sofosbuvir, making it suitable for effective treatment of hepatitis C, either alone or in combination with other drugs, and can be formulated into pharmaceutical forms for patient consumption.
Implementation Method 1
converting a compound of formula 17 to a compound of formula 16
Implementation Method 2
oxidizing the compound of formula 16 to get a compound of formula 15
Implementation Method 3
fluorinating the compound of formula 15 to obtain fluoro sulfate compound of formula 14
Implementation Method 4
hydrolyzing the compound of formula 14 to yield a compound of formula 13
Data Source
AI summary
A process for the preparation of intermediates 9, useful in the synthesis of sofosbuvir, as well as intermediates of formula [12] are disclosed herein.