Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 27, Issue 63, Pages 15722-15729Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202102621
Keywords
Cycloaddition; fluorinated scaffolds; heterocycles; photochemistry; reaction mechanisms
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This study explores the Paterno-Buchi reactions between heteroaromatics, trifluoromethylphenyl ketone, and electron-rich alkenes to form oxetanes. A comprehensive investigation is conducted on the reaction of aromatic ketones with fluorinated alkenes. The results explain the regioselectivity and open perspectives for oxetanes as core structures for biologically active compounds.
In the context of new scaffolds obtained by photochemical reactions, Paterno-Buchi reactions between heteroaromatic, trifluoromethylphenyl ketone and electron rich alkenes to give oxetanes are described. A comprehensive study has then been carried out on the reaction of aromatic ketones with fluorinated alkenes. Depending on the substitution pattern at the oxetane ring, a metathesis reaction is described as a minor side process to give mono fluorinated alkenes. Overall, this last reaction corresponds to a photo-Wittig reaction and yield amid isosteres. In order to explain the uncommon regioselectivity of the Paterno-Buchi reaction with these alkenes, electrostatic-potential derived charges (ESP) have been determined. In a second computational study, the relative stabilities of the typical 1,4-diradical intermediates of the Paterno-Buchi reaction have been determined. The results well explain the regioselectivity. Further transformations of the oxetanes or previous functionalization of the fluoroalkenes open perspectives for oxetanes as core structures for biologically active compounds.
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