Enantio‐ and Regioselective Palladium(II)‐Catalyzed Dioxygenation of (Aza‐)Alkenols
作者:Sabrina Giofrè、Letizia Molteni、Donatella Nava、Leonardo Lo Presti、Egle Maria Beccalli
DOI:10.1002/anie.202109312
日期:2021.9.27
An oxidative Pd-catalyzed intra-intermolecular dioxygenation of (aza-)alkenols has been reported, with total regioselectivity. To study the stereoselectivity, different chiral ligands as well as different hypervalent-iodine compounds have been compared. In particular, by using a C-6 modified pyridinyl-oxazoline (Pyox) ligand and hypervalent iodine bearing an aromatic ring, an excellent enantio- and
Switchable Oxidative Reactions of <i>N</i>-allyl-2-Aminophenols: Palladium-Catalyzed Alkoxyacyloxylation vs an Intramolecular Diels–Alder Reaction
作者:Sabrina Giofrè、Manfred Keller、Leonardo Lo Presti、Egle M. Beccalli、Letizia Molteni
DOI:10.1021/acs.orglett.1c02539
日期:2021.10.15
The Pd(II)-catalyzed reaction of N-allyl-2-aminophenols in the presence of PhI(OCOR)2 as the oxidant resulted in an alkoxyacyloxylation process, with the formation of functionalized dihydro-1,4-benzoxazines. The reaction performed in the absence of palladium catalyst switched to an intramolecular Diels–Alder reaction (IMDA) pathway, which was the result of an oxidative dearomatization of the 2-aminophenol