Allene-Prins Macrocyclization for Halichondrin Synthesis
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Solution Overview
Problem
Current methods for synthesizing halichondrin B and its analogs are limited by the need for new and efficient approaches to form specific macrocyclic bonds, particularly the C.26-C.27 bond, which is crucial for the production of potent anticancer agents like eribulin mesylate.
Innovation Solution
The method involves reacting an intermediate of formula (IA) with R12OH and a Lewis acid, such as boron trifluoride, to form a macrocyclic intermediate through an allene-Prins reaction, enabling the synthesis of halichondrin macrolides or their analogs by forming the C.26-C.27 bond.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional synthesis methods are used to form the C.26-C.27 bond in halichondrin macrolides, then the synthesis process becomes complex and inefficient, but the macrocyclic bond formation is still achieved
Solution Approach 1:
The patent applies parameter changes by utilizing a Prins reaction with specific reagents (allylic alcohol and carbonyl compound) under controlled conditions to form the C.26-C.27 bond. This changes the reaction parameters from conventional methods to achieve更高效 macrocyclization with fewer steps and improved yield, directly resolving the contradiction between synthesis efficiency and process complexity
Solution Approach 2:
The patent employs an intermediary approach by using a Prins reaction as a mediating process to form the macrocyclic bond. The reaction uses specific intermediates (allylic alcohol, carbonyl compound, and acid catalyst) to facilitate the C.26-C.27 bond formation, simplifying the overall synthesis pathway while maintaining effectiveness
2Productivity
If new synthesis approaches are developed for halichondrin analogs, then the productivity improves, but the manufacturing precision may be compromised
Solution Approach 1:
The patent applies preliminary action by pre-organizing the substrate and reagents in the Prins reaction to ensure correct stereochemistry and structural accuracy during macrocyclization. The reaction conditions are designed to favor the formation of the desired C.26-C.27 bond with correct configuration, maintaining manufacturing precision while improving productivity through a more direct synthetic route
Solution Approach 2:
The patent employs local quality by optimizing specific reaction conditions (catalyst selection, temperature, solvent) for the Prins reaction to ensure high precision in the C.26-C.27 bond formation. This localized optimization of reaction parameters maintains structural accuracy while enabling faster synthesis throughput
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 allows for the efficient preparation of macrocyclic intermediates and ultimately the synthesis of halichondrin macrolides or their analogs, including eribulin, by forming the critical C.26-C.27 bond, enhancing the production of potent anticancer compounds.
Implementation Method 1
reacting an intermediate of formula (IA) with R12OH and a Lewis acid, such as boron trifluoride, to form a macrocyclic intermediate through an allene-Prins reaction
Data Source
AI summary
The invention provides methods for the synthesis of a halichondrin macrolides or analogs thereof through a cyclization reaction strategy. The strategy of the present invention involves subjecting an intermediate to Prins reaction conditions to afford a macrolide. The invention also provides compounds useful as intermediates in the synthesis of a halichondrin macrolides or analogs thereof and methods for preparing the same.