Migalastat Synthesis via Double Reductive Amination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for synthesizing migalastat, a potent galactosidase inhibitor, face challenges such as low yield, requirement for toxic reducing agents, and environmental hazards, making them unsuitable for industrial-scale production with high purity and safety.
Innovation Solution
A process involving double reductive amination of a dicarbonyl compound with a specific amine and reducing agent, followed by conversion and purification, which includes the use of safer borane complexes and improved solvent systems to enhance yield and stereochemical purity, allowing for efficient separation of diastereoisomers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If double reductive amination is performed using NaCNBH3 as reducing agent, then the reaction can proceed, but toxic HCN is released and cyanide ions contaminate wastewater
Solution Approach 1:
The patent replaces the harmful NaCNBH3 reducing agent with safer alternatives such as NaBH4, BH3·THF, or BH3·SMe2 that eliminate toxic HCN release and cyanide contamination while maintaining effective reductive amination reaction capability
Solution Approach 2:
The patent employs readily available and safer reducing agents like sodium borohydride (NaBH4) that can be used in standard conditions without requiring special safety infrastructure, making the process suitable for industrial scale-up
2Productivity
If excess NaCNBH3 is used to drive the reductive amination, then the reaction yield may improve, but the amount of toxic cyanide waste increases
Solution Approach 1:
The patent eliminates the trade-off between yield and waste by replacing NaCNBH3 with non-toxic reducing agents like NaBH4 that provide equivalent or superior reaction efficiency without generating harmful cyanide waste, even when used in excess
3Manufacturing precision
If chromatography is used to purify the product, then high purity migalastat can be obtained, but the process complexity and cost increase
Solution Approach 1:
The patent employs protecting groups (such as acetonide or isopropylidene groups) that are installed before the reductive amination reaction to pre-direct the stereochemistry and protect sensitive functional groups, thereby simplifying subsequent purification steps and enabling crystallization-based isolation instead of chromatography
Solution Approach 2:
The patent modifies the reaction conditions and substrate structure (using protected dicarbonyl compounds) to favor the formation of the desired stereoisomer, allowing purification by simpler crystallization or filtration methods rather than requiring complex chromatographic separation
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 higher yields and improved stereochemical purity of migalastat, facilitating safer and more environmentally friendly industrial-scale production while overcoming the limitations of previous methods.
Implementation Method 1
double reductive amination of a dicarbonyl compound of formula (VI) with an amine of formula (VII)
Data Source
AI summary
The present invention relates to a process for the preparation of migalastat of formula (I) and intermediates useful in the synthesis thereof. The process comprises the double reductive amination reaction of a compound of formula (VI).