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Regiocontrol Using Fluoro Substituent on 3,6-Disubstituted Arynes
Eito Yoshioka1, Yousuke Yamaoka1, Shunsuke Shimada1
1School of Pharmacy and Department of Pharmacy, Hyogo Medical University.
The study investigated how fluorine substituents influence the regioselectivity of 3,6-disubstituted aryne reactions. Fluorine and bromine substituents enabled high regiocontrol in cycloaddition and insertion reactions.
Area of Science:
- Organic Chemistry
- Synthetic Chemistry
Background:
- Arynes are highly reactive intermediates crucial in organic synthesis.
- Controlling the regioselectivity of aryne reactions is essential for targeted synthesis.
Purpose of the Study:
- To investigate the impact of fluoro substituents on the regioselectivity of 3,6-disubstituted aryne reactions.
- To explore the use of fluorine and other electron-withdrawing groups in directing aryne reactivity.
Main Methods:
- Studied reactions of 3,6-disubstituted arynes bearing fluorine and other electron-withdrawing groups.
- Examined (3+2) cycloaddition reactions with benzyl azide.
- Investigated aryne insertion into Sn-F sigma bonds.
- Analyzed three-component coupling reactions involving aryne insertion into C=O pi bonds.
Main Results:
- Achieved a reasonable degree of regiocontrol in the (3+2) cycloaddition of fluoro-bromo substituted arynes with benzyl azide.
- Demonstrated high regiocontrol in the insertion of arynes into Sn-F sigma bonds.
- Observed high regiocontrol in three-component coupling reactions involving aryne insertion into C=O pi bonds.
Conclusions:
- Fluoro substituents significantly influence the regioselectivity of 3,6-disubstituted aryne reactions.
- The presence of both fluorine and bromine substituents enhances regiocontrol in cycloaddition reactions.
- Aryne insertion reactions into Sn-F and C=O bonds show high regioselectivity when directed by fluoro substituents.
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