Giofrè S, Keller M, Lo Presti L, Beccalli EM, Molteni L. Switchable Oxidative Reactions of
N-allyl-2-Aminophenols: Palladium-Catalyzed Alkoxyacyloxylation vs an Intramolecular Diels-Alder Reaction.
Org Lett 2021;
23:7698-7702. [PMID:
34570517 PMCID:
PMC8524420 DOI:
10.1021/acs.orglett.1c02539]
[Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
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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, nucleophilic addition, and Diels–Alder
reaction cascade, highlighting the role of the oxidant as both a nucleophilic
donor and an oxidizing agent.
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