Bile Acid Derivative Synthesis via Segmented Grignard and Oxidative Cleavage
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Solution Overview
Problem
Current synthetic routes for producing a compound of formula I are inefficient, requiring multiple steps and resulting in low yields, making large-scale industrial production challenging.
Innovation Solution
A 4-step or 6-step process is developed, involving specific chemical transformations such as Grignard reactions, oxidative cleavage, reduction, and sulfonation, which improves yield and reduces the number of steps compared to existing methods, allowing for commercial-scale production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If current synthetic routes are used, then the compound can be produced, but the yield is low and the number of steps is high
Solution Approach 1:
The synthesis route is divided into distinct functional segments: (1) protection of hydroxy groups, (2) Grignard reaction for ring formation, (3) oxidative cleavage of double bond, (4) reduction of carboxylic acid, and (5) sulfonation. This segmentation allows each step to be optimized independently, achieving high overall yield while maintaining manageable complexity through systematic organization of transformations.
Solution Approach 2:
Hydroxy groups are protected at the beginning of the synthesis sequence before subsequent transformations. This preliminary protection prevents unwanted side reactions during Grignard reaction and oxidative cleavage steps, ensuring high yield by preserving the integrity of functional groups that would otherwise interfere with later reactions.
2Productivity
If current synthetic routes are used, then the compound can be produced, but the process is inefficient for large-scale production
Solution Approach 1:
The synthesis employs parameter optimizations including: (1) selection of specific protecting groups that facilitate high-yield deprotection, (2) control of oxidative cleavage conditions to prevent over-oxidation, (3) optimization of reduction conditions for complete conversion, and (4) selection of sulfonating agents that provide high yields. These parameter changes collectively enable efficient large-scale production.
Solution Approach 2:
The synthesis route is designed with continuous productive transformations where each step builds upon the previous one without unnecessary interruptions. The protected intermediate undergoes sequential transformations (Grignard reaction → oxidative cleavage → reduction → sulfonation) in a continuous flow of useful chemical actions, maximizing manufacturing efficiency for scale-up.
3Adaptability or versatility
If current synthetic routes are used, then the compound can be produced, but different methodologies and bond forming/breaking steps are required
Solution Approach 1:
The protected intermediate serves multiple functions throughout the synthesis: it protects hydroxy groups during Grignard reaction, enables subsequent oxidative cleavage, and provides a stable platform for reduction and sulfonation. This multi-functionality of the protected intermediate structure allows diverse transformations to proceed from a single versatile platform, achieving adaptability without proportionally increasing complexity.
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 new process achieves a significantly higher yield of at least 46%, enabling large-scale industrial synthesis of the compound, compared to the approximately 7% yield of existing methods, while utilizing different methodologies and bond forming/breaking steps.
Implementation Method 1
Grignard reaction to form a compound of formula 3A
Implementation Method 2
oxidative cleavage of the double bond of a compound of formula 3A
Implementation Method 3
reduction of the C23 carboxylic acid of a compound of formula 4A
Implementation Method 4
sulfonation of the C23 hydroxy group of a compound of formula 5A
Data Source
AI summary
The present invention relates to processes for preparing compounds of formula I:or a pharmaceutically acceptable salt or solvate thereof.