Enantioselective Photochemical Rearrangements of Spirooxindole Epoxides Catalyzed by a Chiral Bifunctional Xanthone
作者:Mark M. Maturi、Alexander Pöthig、Thorsten Bach
DOI:10.1071/ch15280
日期:——
The title compounds were shown to undergo an enantioselective photochemical rearrangement to 3-acylindolin-2-ones (16–33 % ee). A xanthone, which is tethered via an anellated oxazole to a chiral 1,5,7-trimethyl-3-azabicyclo[3.3.1]nonan-2-one scaffold, efficiently catalyzed this reaction at λ 366 nm, presumably by triplet sensitization. The observed enantioselectivity can be explained by hydrogen bonding