Fluorinated Methoxydibenzo[b,f]oxepin Synthesis for Bidirectional Switching
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Solution Overview
Problem
There is a need for a fast, cheap, and simple method to obtain branched dibenzo[b,f]oxepin derivatives with fluoroazobenzenes that exhibit good atomic economics and are suitable for use as molecular switches in biological systems and photopharmacology, particularly for applications requiring bidirectional photoconversion using visible or near-infrared light.
Innovation Solution
A method involving the reaction of methoxydibenzo[b,f]oxepin with fluoroazobenzene in the presence of a solvent and catalyst, using thionyl chloride as a reagent, followed by evaporation and dissolution steps, to produce fluorinated derivatives characterized by stable and bidirectional photoconversion properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods are used to synthesize dibenzo[b,f]oxepin derivatives with fluoroazobenzenes, then the synthesis process is complex and time-consuming, but the method lacks atomic economics and efficiency
Solution Approach 1:
The synthesis process is divided into distinct sequential steps: (a) formation of chloroazobenzene intermediate by reacting fluoroazobenzene with thionyl chloride, (b) coupling of chloroazobenzene with methoxydibenzo[b,f]oxepin to form the final derivative. This segmentation allows each step to be optimized independently, improving overall productivity while maintaining clarity in the reaction pathway.
Solution Approach 2:
The chloroazobenzene intermediate is prepared in advance through reaction with thionyl chloride before the main coupling step. This preliminary action facilitates the subsequent reaction with methoxydibenzo[b,f]oxepin, reducing the overall synthesis time and improving atomic economics by avoiding multiple steps in the conventional one-pot method.
2Loss of substance
If conventional synthesis methods are used, then the process is simple, but it lacks good atomic economics and produces poor yields
Solution Approach 1:
The reaction conditions are optimized by changing key parameters: using thionyl chloride as a reagent in step (a), controlling the molar ratio of fluoroazobenzene to methoxydibenzo[b,f]oxepin at 1:1 or 1:0.85, and selecting appropriate solvents (methylene chloride, ethyl acetate). These parameter changes improve atomic economics and reaction efficiency while maintaining reasonable synthesis simplicity.
Solution Approach 2:
Thionyl chloride acts as an intermediary reagent that converts fluoroazobenzene into a more reactive chloroazobenzene intermediate. This intermediary facilitates the subsequent coupling reaction with methoxydibenzo[b,f]oxepin, improving atom utilization and reaction efficiency without requiring harsh conditions.
3Productivity
If the reaction is heated to higher temperatures to improve reaction rate, then productivity increases, but energy consumption and potential decomposition increase
Solution Approach 1:
The reaction is performed in continuous stirred tanks with controlled heating, maintaining optimal temperature throughout the reaction process. The use of catalysts and optimized reagent ratios ensures the reaction proceeds efficiently at moderate temperatures, avoiding excessive energy input while maintaining high productivity through continuous processing.
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 enables the synthesis of fluorinated dibenzo[b,f]oxepin derivatives that function as effective molecular switches in biological systems and photopharmacology, utilizing visible or near-infrared light for bidirectional photoconversion with good atomic economics.
Implementation Method 1
In the first step, thionyl chloride is added to fluoroazobenzene 4a-d and 5a-d, and thereafter the mixture is heated.
Implementation Method 2
The reaction mixture is then evaporated to dryness, followed by dissolving several times in an aprotic organic solvent and evaporating again to dryness.
Implementation Method 3
a catalyst is added, and the residue from step (b) dissolved in an aprotic organic solvent, and the reaction mixture is then stirred.
Data Source
AI summary
The invention provides fluorinated derivatives of methoxydibenzo[b,f]oxepin of general formula (1) and general formula (2) and a method for obtaining thereof in a catalysed reaction of fluoroazobenzene with methoxydibenzo[b,f]oxepin. The preferable catalyst of the reaction is triethylamine, and the compounds obtained may be useful as molecular switches in biological systems and photopharmacology.