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Controlled reduction of isocyanates to formamides using monomeric magnesium
Rohit Kumar1,2, Vishal Sharma1,2, Subhrashis Banerjee2,3
1Inorganic Chemistry and Catalysis Division, CSIR-National Chemical Laboratory, Dr Homi Bhabha Road, Pashan, Pune 411008, India. ss.sen@ncl.res.in.
This study presents a new transition metal-free method for reducing isocyanates to formamides using pinacolborane and a magnesium catalyst. This efficient process selectively yields N-boryl formamides, offering a valuable synthetic route.
Area of Science:
- Organic Chemistry
- Catalysis
- Synthetic Methodology
Background:
- Isocyanates are versatile synthetic intermediates.
- Controlled reduction of isocyanates to formamides is synthetically important.
- Existing methods may lack selectivity or require transition metals.
Purpose of the Study:
- To develop a novel transition metal-free reduction of isocyanates.
- To achieve selective formation of formamide derivatives.
- To utilize pinacolborane as a hydrogenating agent with a novel catalyst.
Main Methods:
- Employed a bis(phosphino)carbazole ligand stabilized magnesium methyl complex as a catalyst.
- Utilized pinacolborane (HBpin) as the hydrogenating agent.
- Investigated the reduction of various isocyanate substrates.
Main Results:
- Developed an efficient and controlled reduction methodology.
- Achieved exclusive formation of formamide derivatives.
- Demonstrated selective hydroboration yielding N-boryl formamides across a range of substrates.
Conclusions:
- The developed magnesium-catalyzed method offers a transition metal-free route to N-boryl formamides.
- This methodology provides a selective and efficient transformation of isocyanates.
- The use of pinacolborane as a hydrogenating agent is effective in this system.
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