Vanadium Catalysts for Selective Carbon Isotope Exchange
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Solution Overview
Problem
Current catalysts for carbon isotope exchange (CIE) are unsuitable due to high preference for cross metathesis, limiting the use of first-row metals like Vanadium (V) which are more abundant, cost-effective, and have lower environmental impact, and lack efficient and selective homogeneous well-defined catalysts for CIE processes.
Innovation Solution
Development of V-based catalysts with specific structures for CIE, utilizing a sequence of dehydrogenation, olefin metathesis, and hydrogenation reactions with Ir- or Co-based catalysts, and V-based catalysts to exchange carbon isotopes in compounds, enabling regioselective formation of metallacyclobutane and avoiding cross-products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Ru, Mo, or W-based homogeneous catalysts are used for olefin metathesis, then high activity and functional group stability are achieved, but the cost increases and environmental footprint expands due to rarity and toxicity
Solution Approach 1:
The patent replaces expensive, rare, and toxic second- and third-row transition metals (Ru, Mo, W) with first-row transition metals (V, Cr, Mn, Fe, Co, Ni, Cu) that are abundant, inexpensive, and less toxic. This substitution maintains catalytic functionality while dramatically reducing cost and environmental impact, embodying the principle of using cheaper alternatives that perform adequately for the intended application.
Solution Approach 2:
The patent modifies the catalyst composition by changing the metal center from rare/toxic metals to abundant/less toxic first-row transition metals. This parameter change in catalyst composition achieves similar catalytic activity and functional group stability while improving cost-effectiveness and reducing environmental footprint and toxicity.
2Productivity
If currently used OM catalysts are employed, then olefin metathesis reactions proceed efficiently, but cross metathesis is highly preferred over the desired CIE process
Solution Approach 1:
The patent introduces specific ligand environments around the first-row transition metal centers that create local electronic and steric properties favoring CIE over cross metathesis. The ligand design modifies the catalyst's local characteristics to selectively promote the desired carbon isotope exchange reaction while maintaining high reaction efficiency.
Solution Approach 2:
The patent changes the catalyst parameters by using first-row transition metals with different electronic configurations and coordination preferences compared to traditional OM catalysts. This parameter change in metal identity and ligand composition shifts the reaction selectivity from cross metathesis to carbon isotope exchange while preserving catalytic activity.
3Object-affected harmful factors
If V-based catalysts are used for CIE, then cost decreases and environmental impact reduces, but efficient and selective homogeneous well-defined catalysts are currently unavailable
Solution Approach 1:
The patent creates composite catalyst systems by combining first-row transition metal centers with specifically designed ligand frameworks. This composite approach integrates the cost and environmental advantages of first-row metals with the efficiency and selectivity of well-defined homogeneous catalyst structures, achieving all desired properties simultaneously.
Solution Approach 2:
The patent uses specially designed ligands as intermediaries that bridge the gap between the simple first-row transition metal centers and the complex catalytic functions required for efficient and selective CIE. These ligand intermediaries provide the necessary electronic and steric control to achieve high catalyst performance while maintaining the advantages of first-row metals.
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 V-based catalysts facilitate efficient and selective carbon isotope exchange in pharmaceuticals and natural products, making labeled compounds accessible without the need for new synthetic strategies, and offer superior performance compared to traditional catalysts.
Implementation Method 1
Olefin metathesis (OM) is a vital reaction that utilizes heterogeneous and homogeneous transition metal catalysts. V-based catalysts facilitate efficient and selective carbon isotope exchange in pharmaceuticals and natural products
Implementation Method 2
converting the terminal methyl group of the compound to a terminal CH2 moiety, i.e., ═CH2, in the presence of a labeled carbon (*C) source and a V-based catalyst
Implementation Method 3
converting the labeled terminal *CH2 moiety, i.e., ═*CH2, to a labeled terminal methyl group, i.e.,—*CH3, wherein the conversion of terminal ═*CH2 to—*CH3 occurs via a hydrogenation reaction in the presence of a hydrogen donor, and a second catalyst
Data Source
AI summary
The subject invention provides catalytical compounds/complexes, compositions comprising such compound/complex, synthesis of the compounds/complexes, and methods of using such compounds/complexes as catalysts in, for example, carbon isotope exchange (CIE) on target bioactive molecules. Methods that allow CIE directly on drug candidates are of great importance to chemistry, biology, and medicine. Especially valuable are catalytic procedures that rely on a limited collection of available labeled materials. The instant method comprises converting a methyl group to terminal ═CH2 utilizing transfer dehydrogenation catalysts to enable V-based olefin metathesis, followed by a hydrogenation step. The one-pot strategy allows the formal methylation/demethylation sequence and can be applied to an assortment of alkyl-containing compounds.