1,2-Acyl transposition through photochemical skeletal rearrangement of 2,3-dihydrobenzofurans.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40339026.
- Also identified by DOI 10.1126/science.adv9915 and PMC identifier 12594444.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
Saturated heterocycles are commonly adorned with groups that influence their biological properties. Synthetic methods that transpose existing substituents on saturated heterocycles to multiple peripheral positions are therefore highly valuable. In this work, we report a formal 1,2-acyl transposition through the photochemical exchange of the C<sub>2</sub>-C<sub>3</sub> positions of C<sub>2</sub>-acylated dihydrobenzofurans. This strategy relies on an unusual photochemical isomerization of the dihydrobenzofuran core to a highly electrophilic spiro-cyclopropane intermediate that is then intercepted by a halide nucleophile. A variety of aryl ketones are transposed using 370-nanometer centered irradiation. Additionally, carboxylic acids, esters, and amides can be transposed using 310-nanometer centered irradiation. This work highlights the power of a skeletal rearrangement to achieve a net peripheral modification.