Phragmalin Limonoid Synthesis via Segmented Ring Opening and Closing
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Solution Overview
Problem
The synthesis of compounds with sexual enhancing activity, particularly those with structure (1), is hindered by their rarity in plants, difficulty in isolation, and the complexity of ring opening and closing reactions, leading to low yields and excessive side products using conventional methods.
Innovation Solution
A novel process is developed to efficiently synthesize compounds with structure (1) and (5) using distinct conditions and reagents, achieving chemoselectivity and regioselectivity, and providing a high-yield route from readily available starting materials, including the conversion of compound (2a) to (1) and (5), and inducing aggressive behavior in mammals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional isolation methods are used to obtain compounds with structure (1), then the compounds can be obtained, but the process is difficult and expensive with low yields due to rarity in plants
Solution Approach 1:
The synthesis is divided into multiple discrete steps: ring opening of the lactone ring in compound (2a) to form intermediate (3), followed by ring closing to form compound (1). This segmentation allows each step to be optimized independently, improving overall yield and feasibility.
Solution Approach 2:
A novel intermediate compound with structure (3) is introduced as a bridge between the readily available starting material (2a) and the target compound (1). This intermediary enables the transformation through manageable steps rather than attempting direct conversion.
2Quantity of substance
If conventional ring opening and closing methods are used, then the transformation can be achieved, but excessive side products are formed and yields are low
Solution Approach 1:
Distinct reaction conditions and reagents are employed for the ring opening and ring closing steps, optimizing parameters such as temperature, solvent, and catalyst to maximize selectivity and minimize side product formation.
Solution Approach 2:
The patent transforms the challenge of ring opening and closing reactions, which conventionally produce excessive side products, into a high-yield process by using novel reagents and conditions that selectively drive the desired transformations while suppressing unwanted side reactions.
3Ease of manufacture
If full synthesis of compound (1) is attempted using conventional methods, then the target compound can be produced, but the process is very difficult and has not been successfully attempted thus far
Solution Approach 1:
The lactone ring in compound (2a) is opened in advance to form intermediate (3) before the ring closing step. This preliminary action simplifies the overall synthesis by breaking down the complex transformation into preparatory and final steps, making the process feasible.
Solution Approach 2:
The complex synthesis is segmented into distinct manageable steps: ring opening to form intermediate (3), followed by ring closing to form compound (1). This segmentation reduces the overall complexity and makes the synthesis achievable through systematic approach.
Data Source
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AI summary
The present invention relates to novel chemical compounds, to methods for synthesis of such compounds, and to the use of these novel compounds in the synthesis of other chemical compounds that, inter alia, may be used in the treatment of sexual dysfunction, and for eliciting enhancing effects on sexual behavior. The invention also relates to remarkable biological properties of the novel compounds in their capacity of inducing aggressive behavior.