Synthesis 2022; 54(12): 2894-2806
DOI: 10.1055/s-0037-1610793
paper

Pd-Catalyzed N–H or C–H Functionalization/Oxidative Cyclization for the Efficient Synthesis of N-Aryl-Substituted [3,4]-Fused Pyrrolo­coumarins

Thomas D. Balalas
a   Laboratory of Organic Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, University Campus, Thessaloniki 54124, Greece
,
Maria G. Kanelli
a   Laboratory of Organic Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, University Campus, Thessaloniki 54124, Greece
,
Catherine Gabriel
b   Center for Research of the Structure of Matter, Magnetic Resonance Laboratory, Department of Chemical Engineering, Aristotle University of Thessaloniki, University Campus, Thessaloniki 54124, Greece
,
Eleni Pontiki
c   Department of Pharmaceutical Chemistry, School of Pharmacy, Faculty of Health Sciences, Aristotle University of Thessaloniki, University Campus, Thessaloniki 54124, Greece
,
Dimitra J. Hadjipavlou-Litina
c   Department of Pharmaceutical Chemistry, School of Pharmacy, Faculty of Health Sciences, Aristotle University of Thessaloniki, University Campus, Thessaloniki 54124, Greece
,
a   Laboratory of Organic Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, University Campus, Thessaloniki 54124, Greece
› Author Affiliations


Abstract

1-Aryl-2-methyl- or 3-methylchromeno[4,3-b]pyrrol-4(1H)-ones have been synthesized in excellent yields by the Pd-catalyzed intramolecular aza-Wacker-type cyclization of 3-allyl-4-arylaminocoumarins or C–H insertion/oxidative cyclization of N-allyl-N-aryl-4-aminocoumarins, respectively, in the presence of Cu(OAc)2 in acetic acid under heating. The starting allylcoumarins have been prepared by the allylation of 4-arylaminocoumarins with allyl bromide in CH3CN in the presence of Cs2CO3 at room temperature. Preliminary biological tests indicated interesting antioxidant activity and significant levels of inhibition of soybean lipoxygenase.

Supporting Information



Publication History

Received: 20 December 2021

Accepted after revision: 24 January 2022

Article published online:
09 March 2022

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