Ergosterol-Derived Intermediate Route to Dydrogesterone

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Solution Overview

Problem

Current synthetic routes for dydrogesterone face challenges such as low conversion rates, safety risks, high by-product formation, and difficulty in obtaining raw materials, making industrial production unfeasible.

Innovation Solution

A new synthesis process using photochemical conversion and controlled oxidation reactions to convert a readily available intermediate compound, derived from phytosterols, to dydrogesterone, with high yield and scalability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If photochemical conversion is used to synthesize 10α configuration intermediate from ergosterol, then the intermediate can be obtained, but the conversion rate is low and separation is difficult

Engineering Contradiction:

Improveconversion rateVSAvoidseparation difficulty

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The patent changes the photochemical reaction parameters by using specific wavelength UV light (300-350nm) and optimizing reaction conditions to improve conversion rate and simplify separation. This resolves the contradiction by modifying physical parameters of the photochemical process to achieve both high conversion and easy separation.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If ozone oxidation is used in the synthesis process, then oxidation reactions can be performed, but safety risks increase and by-products are generated

Engineering Contradiction:

Improveoxidation capabilityVSAvoidsafety risks

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces ozone with molecular oxygen from air as the oxidant. Molecular oxygen is safer, cheaper, and environmentally friendly compared to ozone. This substitution eliminates safety risks associated with ozone handling while maintaining oxidation capability, and reduces by-product formation.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent uses air or oxygen-enriched atmosphere as a safer alternative to ozone for oxidation reactions. This creates a controlled oxidizing environment that is inherently safer and produces fewer harmful by-products, resolving the contradiction between oxidation capability and safety.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

3Productivity

If lumisterol-4,7,22-trien-3-one is used as raw material for 4-step reaction, then dydrogesterone can be synthesized, but yield is low in each step and starting materials are difficult to obtain

Engineering Contradiction:

Improveoverall yieldVSAvoidavailability of starting materials

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The patent performs preliminary photochemical conversion of ergosterol to 10α-configured intermediates with optimized structure before subsequent oxidation steps. This preliminary action creates intermediates that are more reactive and lead to higher overall yields, while ergosterol itself is readily available from natural sources.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes the starting material from lumisterol-4,7,22-trien-3-one to ergosterol, which is more readily available from natural sources. This parameter change in raw material selection, combined with optimized photochemical and oxidation conditions, achieves both high availability and high overall yield.

Inventive Principle:

Principle #35Parameter changes

4Device complexity

If trans-progesterone is used as raw material with tetrachlorobenzoquinone oxidant, then synthesis route is concise, but trans-progesterone synthesis is challenging and industrial products do not exist

Engineering Contradiction:

Improvesynthesis route complexityVSAvoidindustrial feasibility

Core Design Contradiction:

Device complexityVSEase of manufacture

Solution Approach 1:

Instead of starting with trans-progesterone and working forward to dydrogesterone, the patent inverts the approach by starting with naturally abundant ergosterol and working forward through photochemical conversion and oxidation. This inverted route achieves the same goal with readily available materials and industrial feasibility.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent changes the raw material parameter from trans-progesterone to ergosterol, and replaces tetrachlorobenzoquinone oxidant with molecular oxygen. These parameter changes simplify the synthesis route and make it industrially feasible while maintaining conciseness.

Inventive Principle:

Principle #35Parameter changes

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 method achieves a high overall yield and facilitates industrial production of dydrogesterone, overcoming the limitations of existing methods by using environmentally friendly raw materials and reducing safety risks.

Implementation Method 1

This intermediate then undergoes Oppenauer oxidation, double bond migration, ozone oxidation, enamination, and finally oxidation to produce dydrogesterone. However, the photoconversion process has a low conversion rate

Methodology Applied

Scientific EffectPhotochemical conversion: Photodissociation

Implementation Method 2

This intermediate then undergoes Oppenauer oxidation, double bond migration, ozone oxidation, enamination, and finally oxidation to produce dydrogesterone

Methodology Applied

Scientific EffectOxidation: Oxidation

Data Source

PatentUS20250296950A1Intermediate compound and preparation method therefor and application thereof

Publication Date: 2025.09.25 HUNAN KYF PHARM CO LTD

AI summary

The present application provides an intermediate compound and a preparation method therefor and an application thereof. The intermediate compound has the following structural formula (I). By using the intermediate compound of the present application, dedrogesterone can be conveniently synthesized only by performing AB ring double bond construction and side chain modification, the total yield is high, and the route is short.