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Photochemical [2+2] Cycloaddition of Alkynyl Boronates
Oleksandr S Liashuk1,2,3, Oleksandr O Grygorenko1,3, Yulian M Volovenko1
1Chemical Faculty, Taras Shevchenko National University of Kyїv, Kyiv, Volodymyrska Street 60, 01601, Kyїv, Ukraine.
This study introduces a new photochemical [2+2] cycloaddition reaction between alkynyl boronates and maleimides. This method efficiently synthesizes valuable cyclobutenyl boronates, useful for further chemical transformations.
Area of Science:
- Organic Chemistry
- Photochemistry
- Synthetic Methodology
Background:
- Cycloaddition reactions are fundamental in organic synthesis.
- Alkynyl boronates and maleimides are versatile building blocks.
- Developing efficient methods for constructing complex cyclic structures is crucial.
Purpose of the Study:
- To report a novel photochemical [2+2] cycloaddition between alkynyl boronates and maleimides.
- To synthesize maleimide-derived cyclobutenyl boronates.
- To explore the synthetic utility of the obtained products.
Main Methods:
- Photochemical [2+2] cycloaddition reaction.
- Synthesis of maleimide-derived cyclobutenyl boronates.
- Mechanistic studies involving triplet-excited states.
Main Results:
- Achieved 35-70% yield of cyclobutenyl boronates.
- Demonstrated wide functional group compatibility.
- Prepared a cyclobutene-derived analogue of Thalidomide in one step.
- Mechanistic studies indicated triplet-excited maleimides and ground-state alkynyl boronates.
Conclusions:
- The developed protocol offers an efficient route to cyclobutenyl boronates.
- The products serve as versatile synthons for various organic transformations.
- The reaction proceeds via a triplet-excited state mechanism.
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