Sulfolenic Intermediate Synthesis Using Strong-Base Low-Temperature Coupling
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Solution Overview
Problem
There is a need for improved processes to produce vitamin A and its derivatives efficiently, as existing methods are complex and not easily accessible.
Innovation Solution
A new process involving specific intermediates of formula (I) is developed, where compounds of formula (II) are reacted with compounds of formula (III) in the presence of strong bases like Schlesinger base or lithium diisopropylamide, using polar aprotic solvents at low temperatures, with molar ratios varying from 1:2 to 2:1.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If existing synthesis methods for vitamin A and its derivatives are used, then the production process is complex and not easily accessible, but the patent aims to improve ease of manufacture and accessibility
Solution Approach 1:
The synthesis process is divided into distinct stages: formation of the sulfur ylide from compound (II) and base, followed by reaction with compound (III). This segmentation allows each step to be optimized independently, simplifying the overall manufacturing process while maintaining accessibility.
Solution Approach 2:
The patent specifies precise reaction parameters including temperature ranges (-78°C to 0°C), molar ratios (1:1 to 2:1), and solvent types (ether, THF, DCM). By defining these parameters clearly, the complex synthesis becomes reproducible and easier to manufacture with consistent results.
2Productivity
If existing synthesis methods for vitamin A and its derivatives are used, then the production process is complex and not easily accessible, but the patent aims to improve productivity
Solution Approach 1:
The reaction proceeds continuously through well-defined stages without interruption. The sulfur ylide forms in situ and immediately reacts with the aldehyde or ketone, maintaining continuous useful action throughout the process, thereby improving productivity despite the multi-step nature of the synthesis.
Solution Approach 2:
The sulfur ylide acts as an intermediary species that facilitates the coupling between compound (II) and compound (III). This intermediary approach allows the reaction to proceed through a controlled mechanism, improving overall productivity by avoiding direct complex interactions.
3Productivity
If specific reaction conditions are used (strong bases, low temperatures, polar aprotic solvents), then the production of new intermediates is efficient, but the process requires precise control of multiple parameters
Solution Approach 1:
The patent defines specific parameter ranges: strong bases (n-BuLi, LDA, LiHMDS), low temperatures (-78°C to 0°C), and polar aprotic solvents (ether, THF, DCM). These parameter specifications enable efficient production while providing clear operational guidelines, balancing efficiency with ease of operation.
Solution Approach 2:
The reaction conditions are designed to be self-regulating within the specified ranges. The low temperature and inert atmosphere automatically prevent side reactions, while the stoichiometric ratios ensure complete conversion, reducing the need for complex monitoring and control during operation.
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 yields new intermediates that are ideal for synthesizing vitamin A and its derivatives, offering improved efficiency and accessibility.
Implementation Method 1
the compound of formula (II) is reacted with a compound of formula (III) in the presence of strong bases like Schlesinger base or lithium diisopropylamide
Implementation Method 2
the compound of formula (II) is reacted with a compound of formula (III)
Implementation Method 3
using polar aprotic solvents at low temperatures
Data Source
AI summary
The present invention relates to a new process for the production of new specific intermediates, which are preferably used in the production of vitamin A, vitamin A acetate, or β-carotene and derivatives thereof, e.g. canthaxanthin, astaxanthin or zeaxanthin.