Treprostinil Synthesis via Stereoselective Cuprate Addition
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Solution Overview
Problem
Current methods for preparing treprostinil are inefficient and costly due to multiple steps and low yields, making them unsuitable for mass production.
Innovation Solution
A method involving steps such as converting an alkyl halide to a cuprate for stereoselective 1,4-addition, methenylation, deprotection, cyclic carbonate formation, intramolecular Friedel-Crafts allylic alkylation, hydrogenation, and hydrolysis to produce treprostinil with high purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If prior preparation methods (intramolecular alkylation or Pauson-Khand cyclization) are used, then treprostinil can be prepared, but the process requires a large number of steps and column purifications resulting in low yields
Solution Approach 1:
The synthesis is divided into distinct stages: preparation of starting materials (compounds of formulas 1 and 2), cycloaddition reaction to form compound of formula 3, and final conversion to treprostinil. This segmentation allows each stage to be optimized independently, with the cycloaddition reaction being the key high-yield step that avoids multiple purification steps.
Solution Approach 2:
The patent uses compound of formula 3 as a key intermediate that consolidates multiple structural features. This intermediary compound is formed through a single cycloaddition reaction with high yield, eliminating the need for multiple sequential reactions and purifications required in prior art methods.
2Manufacturing precision
If prior preparation methods are used, then treprostinil can be prepared, but the process is costly and time-consuming making it unsuitable for mass production
Solution Approach 1:
The starting materials (compounds of formulas 1 and 2) are prepared in advance with specific stereochemical configurations. This preliminary preparation ensures that the main cycloaddition reaction proceeds with high efficiency and selectivity, reducing the need for subsequent purification steps and making the overall process more suitable for mass production.
Solution Approach 2:
The patent employs specific reaction conditions including temperature control (-78°C to room temperature), solvent selection (dichloromethane, diethyl ether), and catalyst choice (CuI, triethylamine) to optimize the cycloaddition reaction. These parameter changes enable high-yield synthesis with simplified purification, making the process cost-effective for mass production.
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 method enables the cost-effective and efficient production of treprostinil with high purity, suitable for commercial mass production by simplifying the process and increasing yield.
Implementation Method 1
converting an alkyl halide or alkenyl tin of the following formula (3) to its cuprate, and subjecting the cuprate to stereoselective 1,4-addition to an α,β-unsaturated ketone of the following formula (2)
Implementation Method 2
subjecting the compound of the following formula (9) to hydrogenation to obtain a compound of the following formula (10)
Implementation Method 3
hydrolyzing an ester group of the compound of the following formula (12)
Data Source
AI summary
The present invention relates to a cost-effective and efficient method for preparing treprostinil with high purity, and an intermediate therefor.