Sanshool Synthesis via Diene Iron Complex
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Solution Overview
Problem
Current methods for producing sanshools, such as gamma-sanshool and delta-sanshool, face challenges with low yield and low E/Z selectivity, making them impractical for synthesis.
Innovation Solution
A novel diene iron complex compound is used, which reacts with specific deprotecting agents and undergoes reduction and amidation steps to produce sanshools with high stereoselectivity and stability, overcoming the limitations of previous synthesis methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods (Wittig reaction) are used to form triene moiety, then synthesis can be achieved, but yield is low and E/Z selectivity is low
Solution Approach 1:
The patent changes the chemical parameters by replacing the conventional Wittig reaction with a Horner-Wadsworth-Emmons reaction using a phosphonate compound. This parameter change in the reaction type and reagents leads to improved E/Z selectivity and yield in forming the triene moiety of sanshool
Solution Approach 2:
The patent introduces a diene iron complex compound as an intermediate in the synthesis pathway. This intermediate serves as a stable precursor that can be converted to the final sanshool product with high stereoselectivity, resolving the selectivity issue of conventional direct methods
2Reliability
If sanshool is produced as pure substance, then therapeutic effect is improved, but stability is poor due to triene moiety structure
Solution Approach 1:
The patent performs preliminary synthesis of a stable diene iron complex compound that serves as a precursor to sanshool. This preliminary action allows the unstable triene moiety to be introduced in a controlled manner, enabling isolation of pure sanshool with maintained therapeutic activity
Solution Approach 2:
The patent employs a short synthesis pathway using readily available reagents and a stable intermediate that can be easily prepared and converted. The diene iron complex compound acts as a disposable intermediate that facilitates the formation of pure but unstable sanshool product
3Manufacturing precision
If synthesis process is extended to improve selectivity, then E/Z selectivity may improve, but process time increases
Solution Approach 1:
The patent employs a continuous synthesis pathway where the diene iron complex compound intermediate can be directly converted to the final product without isolation or additional purification steps. This continuous action maintains high E/Z selectivity while minimizing process time and losses
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 production of sanshools in a short process with high stereoselectivity and stability, reducing by-product formation and minimizing isomerization, thus providing a practical and efficient synthesis route.
Implementation Method 1
reacting a diene iron complex compound represented by the following general formula (I) with a deprotecting agent selected from the group consisting of cerium (IV) compounds, trimethylamine N-oxide, pyridine N-oxide, iron (III) chloride, copper (II) chloride, dichlorodicyano benzoquinone, and hydrogen peroxide
Implementation Method 2
a step of reducing a diene iron complex compound represented by the following general formula (III)
Data Source
AI summary
Provided are a method for producing a sanshool, which can produce a sanshool in a short process and with high stereoselectivity, as well as a novel diene iron complex compound that is a stable intermediate useful for the production method. The diene iron complex compound is represented by the following general formula (I): (in which A represents CO, P(RA)3, CN, NO, SO(RA)3, or N(RA)2; RA represents a straight chain or branched chain alkyl group having 1 to 4 carbon atoms or an aryl group having 6 to 12 carbon atoms; and one of R1 and R2 represents a hydrogen atom and the other one thereof represents a structure represented by the following formula (II)): (in which R represents a hydrogen atom, a hydroxyl group, or a methyl group