Selective Acylation of Pyripyropene Derivatives
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Solution Overview
Problem
The production of pyripyropene derivatives with acyloxy at the 1-position and hydroxyl at the 7-position is inefficient, requiring multiple steps and high costs due to non-selective hydrolysis and the use of protective groups, which complicates purification and isolation.
Innovation Solution
A process involving selective acylation of hydroxyl groups at the 1-position and 11-position of a trideacyl compound derived from pyripyropene A, allowing for the production of 1,11-diacyloxy compounds through one to three steps, followed by purification and isolation of solvate crystals using appropriate solvents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If non-selective hydrolysis of acyloxy is used to produce pyripyropene derivatives, then the derivatives can be obtained from a 1,7,11-triacyloxy compound, but the production efficiency is low and purification is complicated
Solution Approach 1:
Instead of using non-selective hydrolysis to remove acyloxy groups and then purifying the mixture, the invention inverts the approach by using selective acylation to introduce acyloxy groups only at the desired 1 and 11 positions. This selective acylation method produces the target compound directly with high purity, eliminating the need for complicated purification steps and significantly improving production efficiency
Solution Approach 2:
The invention applies local quality by making the acylation reaction selective for specific positions (1 and 11) on the pyripyropene molecule. By using specific reaction conditions and reagents, the acyloxy groups are introduced only at the desired locations rather than uniformly across all available positions, thereby producing the target compound with the correct structure directly without requiring extensive purification
2Adaptability or versatility
If protective groups are used in the synthesis of pyripyropene derivatives, then acyl can be introduced at the 7-position, but the number of steps increases and production cost rises
Solution Approach 1:
The invention extracts and eliminates the need for protective groups from the synthetic pathway. By using selective acylation conditions that inherently target the 1 and 11 positions without requiring protection of the 7-position hydroxyl group, the method simplifies the synthesis to fewer steps and reduces production costs while maintaining the ability to introduce acyl groups at the desired positions
3Manufacturing precision
If multiple steps are used to selectively acylate hydroxyl groups, then the target compound can be produced with high purity, but the production process becomes lengthy and costly
Solution Approach 1:
The invention merges multiple acylation steps into a single selective acylation operation. By optimizing the reaction conditions, reagents, and catalysts, the process achieves selective acylation at both 1 and 11 positions in one step rather than requiring sequential acylation operations, thereby reducing production time and costs while maintaining high 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 significantly enhances production efficiency by reducing the number of steps, improving yield, and simplifying purification, resulting in a cost-effective and efficient method for producing pyripyropene derivatives useful as insect pest control agents.
Implementation Method 1
selectively acylating, through one to three steps, hydroxyl groups at the 1-position and 11-position of compound B1 with acylating agent
Implementation Method 2
purification and isolation of solvate crystals using appropriate solvents
Data Source
AI summary
Disclosed is a process for efficiently producing pyripyropene derivatives having acyloxy at the 1-position and 11-position and hydroxyl at the 7-position. The process comprises selectively acylating hydroxyl at the 1-position and 11-position of a compound represented by formula B1 through one to three steps with an acylating agent in the presence or absence of a base.