Cyclohomogeranate Synthesis via Acid-Catalyzed Ester Cyclization
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Solution Overview
Problem
Existing synthesis methods for cyclohomogeranates are multistep, low-yielding, and not suitable for industrial scale due to the use of toxic reagents, limited availability of starting materials, and generation of waste, making them economically inefficient and environmentally unsustainable.
Innovation Solution
A two-step process using Brønsted or Lewis acid catalysts to cyclize homogeranic acid esters, allowing for the production of α-/β-cyclohomogeranates or their mixtures with high yields, scalability, and minimal waste generation, suitable for both batch and continuous processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multistep synthesis routes are used (starting from myrcene, cyclogeranic acid, or 2,4,4-trimethyl-2-cyclohexenone), then cyclohomogeranates can be synthesized, but the overall yield is low (less than 20% from myrcene) and multiple purification steps are required
Solution Approach 1:
The invention segments the synthesis by identifying the critical cyclization step as the key transformation, using Brønsted or Lewis acid catalysts to enable direct cyclization of homogeranic acid esters in one or two steps, thereby achieving high yields (70-90%) and eliminating the need for multiple intermediate steps and purifications
Solution Approach 2:
The invention changes the reaction parameters by introducing specific Brønsted or Lewis acid catalysts and optimizing reaction conditions (temperature, solvent, catalyst loading) to achieve high-yielding direct cyclization, transforming a low-yield multistep process into a high-yield streamlined process
2Manufacturing precision
If lab-scale processes with silyl protecting groups or MsCl are used, then cyclohomogeranates can be synthesized, but a lot of waste is produced and reagents have limited availability
Solution Approach 1:
The invention extracts and eliminates the harmful silyl protecting groups and MsCl reagents from the synthesis route, replacing them with environmentally benign Brønsted or Lewis acid catalysts that do not generate excessive waste and use readily available starting materials
Solution Approach 2:
The invention converts the potentially harmful cyclization step into a beneficial process by using catalytic amounts of Brønsted or Lewis acids that promote cyclization without requiring stoichiometric amounts of hazardous reagents, thereby reducing waste while maintaining synthesis efficiency
3Reliability
If stoichiometric amounts of BF3 are used for cyclization, then the reaction proceeds, but a lot of waste products are produced making it unsuitable for industrial application
Solution Approach 1:
The invention replaces stoichiometric BF3 with catalytic amounts of Brønsted or Lewis acid catalysts that can be used in small quantities and regenerated, eliminating the need for large amounts of hazardous reagents while maintaining reliable cyclization reaction
Solution Approach 2:
The invention changes the reaction parameters from stoichiometric reagent usage to catalytic usage, optimizing catalyst loading and reaction conditions to achieve reliable cyclization with minimal waste production, making the process industrially viable
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 process achieves high yields of cyclohomogeranates with reduced waste and simplified purification steps, making it economically viable and environmentally friendly for industrial applications.
Implementation Method 1
cyclizing the compound of formula (III) to obtain compound of formula (I) in the presence of a catalyst selected from Brønsted acid or Lewis acid
Data Source
AI summary
The present invention relates to a process for the preparation of cyclohomogeranates. The invention relates to the synthesis of cyclohomogeranates from well available esters of homogeranic acid in only one step. The cyclohomogeranates prepared according to the process of the present invention can be used in the fragrance industry as intermediates or the compounds can be used as such as aroma compound.