11-Methylene-18-Methyl-Estr-4-en-3,17-dione Synthesis via MnO2 Oxidation
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Solution Overview
Problem
Current methods for synthesizing 11-methylene-18-methyl-estr-4-en-3,17-dione are hindered by the use of chromium(VI)-based reagents, complex chromatographic purifications, and excessive reaction steps, making them unsuitable for industrial-scale production due to safety concerns and inefficiencies.
Innovation Solution
A process involving the oxidation of 11α-hydroxy-18-methyl-estra-4-en-3,17-dione, followed by selective reduction, Wittig reaction, and subsequent hydrolysis, which reduces the number of steps and avoids chromium(VI)-based reagents and chromatographic purifications, using commonly available reagents and solvents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If chromium(VI)-based reagents are used for oxidation, then oxidation efficiency is improved, but safety and carcinogenicity worsen
Solution Approach 1:
The patent changes the chemical parameter of the oxidizing agent from chromium(VI)-based reagents to manganese dioxide (MnO2). This parameter change maintains the oxidation capability while eliminating the carcinogenicity issue, as MnO2 is a safer alternative that does not pose the same health risks as chromium(VI) compounds.
2Manufacturing precision
If complex chromatographic purifications are used, then product purity is improved, but process complexity and time worsen
Solution Approach 1:
The patent extracts and eliminates the need for complex chromatographic purifications by optimizing the reaction conditions and workup procedures. The modified synthesis protocol allows for simpler purification methods, removing the requirement for sophisticated chromatography equipment and reducing both process complexity and time.
3Reliability
If excessive reaction steps are used, then synthesis completeness is improved, but productivity worsens
Solution Approach 1:
The patent merges multiple reaction steps into more efficient sequences. By combining certain transformations and optimizing the order of operations, the protocol reduces the total number of steps while maintaining synthesis completeness. This merging of operations directly improves productivity by reducing time and resource consumption.
4Manufacturing precision
If long and complex laboratory procedures are used for separation, then product purity is improved, but industrial applicability worsens
Solution Approach 1:
The patent adopts simpler, more economical purification methods that are suitable for industrial scale-up. By replacing complex chromatographic techniques with more straightforward separation methods, the process becomes more economically viable and easier to manufacture at industrial levels, while still achieving the required product purity.
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 process efficiently synthesizes 11-methylene-18-methyl-estr-4-en-3,17-dione with fewer steps and safer reagents, making it more industrially viable by eliminating chromium(VI) and chromatographic requirements, while maintaining high yield and product quality.
Implementation Method 1
oxidation of 11α-hydroxy-18-methyl-estra-4-en-3,17-dione (II) to 18-methyl-estra-4-en-3,11,17-trione (III)
Implementation Method 2
Wittig reaction on intermediate compound (V) to form the corresponding methylene derivative (VI)
Implementation Method 3
hydrolysis of intermediate compound (VII) to form 11-methylene-18-methyl-estr-4-en-3,17-dione (I)
Data Source
AI summary
There is described a process for the industrial synthesis of 11-methylene-18- methyl-estr-4-en-3, 17-dione, a compound having the structure formula (I) depicted below: (Formula I) (I) useful as intermediate compound in the synthesis of the progestin compounds Desogestrel and Etonogestrel.