Visible-Light-Mediated Enantioselective Photoreactions of 3-Alkylquinolones with 4-<i>O</i>-Tethered Alkenes and Allenes
作者:Xinyao Li、Christian Jandl、Thorsten Bach
DOI:10.1021/acs.orglett.0c01065
日期:2020.5.1
The title compounds undergo intramolecular [2 + 2] photocycloaddition reactions when irradiated with visible light in the presence of a chiral sensitizer. Up to four defined stereogenic centers are formed in a single step (14 examples with a tethered alkene, 6 examples with an allene, 72-99% yield, 81-99% ee) at catalyst loadings as low as 0.5 mol %. The alkyl group in the 3-position is crucial for