Catalytic Asymmetric Epoxidation of 2-Cyclopentenones
作者:Anna Lee、Corinna M. Reisinger、Benjamin List
DOI:10.1002/adsc.201200072
日期:2012.6.18
The first highly efficient asymmetricepoxidation of 2‐cyclopentenones has been developed. Using a newly designed and readily available Cinchona amine catalyst, 2‐cyclopentenones are reacted with hydrogen peroxide to give the corresponding epoxycyclopentanones in high yields and excellent enantioselectivities.
Visible Light Photocatalysis of 6π Heterocyclization
作者:Niels Münster、Nicholas A. Parker、Lucy van Dijk、Robert S. Paton、Martin D. Smith
DOI:10.1002/anie.201705333
日期:2017.8.1
Photo-mediated 6π cyclization is a valuable method for the formation of fused heterocyclic systems. Here we demonstrate that irradiation of cyclic 2-aryloxyketones with blue LED light in the presence of an IrIII complex leads to efficient and high yielding arylation across a panoply of substrates by energy transfer. 2-Arylthioketones and 2-arylaminoketones also cyclize effectively under these conditions