Li H, Xin J, Xue Y, Wang C. DBU-Mediated Domino Annulation Reaction of 2-Amino-4
H-chromen-4-ones and Aromatic Aldehydes for Synthesis of Polysubstituted 3-Hydroxy-5
H-chromeno[2,3-
b]pyridinones.
J Org Chem 2022;
87:11857-11864. [PMID:
35960790 DOI:
10.1021/acs.joc.2c01152]
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Abstract
A pseudo-three-component annulation reaction of substituted 2-amino-4H-chromen-4-ones with aromatic aldehydes promoted by DBU was investigated to access polysubstituted 5H-chromeno[2,3-b]pyridines. This reaction included a sequential intermolecular nucleophilic addition/Michael cyclization/intramolecular epoxidation/ring opening/aromatization sequence, which possessed excellent step and atom economy in a single operation for generating 3-hydroxy-5H-chromeno[2,3-b]pyridines from readily available substrates.
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