Eribulin C14 Acetal Intermediate Synthesis
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Solution Overview
Problem
Current synthetic methods for eribulin are inefficient due to the need for oxidation state adjustment at C14, lacking diversification and requiring complex functional group manipulation steps, which complicates the total synthesis of this structurally complex molecule.
Innovation Solution
A C14 acetal protected intermediate is used, allowing for the direct conversion to an aldehyde through hydrolysis, reducing the number of oxidation steps and simplifying the synthetic route, thereby making the process greener and more efficient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional oxidation methods are used to convert alcohol to aldehyde at C14, then the oxidation state is adjusted, but the synthesis requires additional oxidation steps and complex functional group manipulation
Solution Approach 1:
The patent applies preliminary action by introducing the acetal protecting group at C14 during the fragment assembly stage, before the oxidation step is needed. This preliminary protection strategy allows the alcohol to be converted to acetal early in the synthesis, avoiding the need for later oxidation steps and simplifying the overall synthetic route to eribulin.
2Ease of manufacture
If multiple functional group manipulation steps are performed, then the fragments are assembled, but the number of steps increases and the process becomes less efficient
Solution Approach 1:
The patent applies parameter changes by modifying the oxidation state parameter at C14 through acetal protection. Instead of performing multiple oxidation steps later, the synthesis uses acetal-protected intermediates that can be directly condensed, changing the chemical parameter (oxidation state) to enable more efficient fragment assembly with fewer steps.
3Manufacturing precision
If oxidation reactions are performed to adjust oxidation state at C14, then the aldehyde is formed, but additional reagents and steps are required
Solution Approach 1:
The patent uses the acetal group as an intermediary at C14. Instead of directly oxidizing the alcohol to aldehyde using multiple oxidation steps, the acetal serves as a stable intermediate that can be formed early and then converted to the aldehyde when needed, acting as a mediator that simplifies the oxidation state adjustment process.
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 approach results in a high-yield, mild reaction method suitable for industrial production of the eribulin intermediate, simplifying the synthesis and reducing the complexity of the process.
Implementation Method 1
the alcohol should undergo an oxidation reaction to be transformed into an aldehyde... A C14 acetal protected intermediate is used, allowing for the direct conversion to an aldehyde through hydrolysis
Data Source
AI summary
Disclosed are an intermediate of Eribulin and a preparation method therefor. In particular, disclosed are compounds as represented by formula II, formula III and formula V and a preparation method therefor. Ar is C1-10 alkyl substituted, alkyloxy substituted or unsubstituted aryl; R1 and R2 is an acetal protecting group or a thioacetal protecting group; R3 is hydrogen or a hydroxyl protecting group; and X is halogen or a leaving group. The preparation method therefor has the advantages of mild reaction conditions, high selectivity, easy purification, low synthesis cost and the like, being suitable for large scale production.