Jiménez-Aberásturi X, Palacios F, de Los Santos JM. Sc(OTf)
3-Mediated [4 + 2] Annulations of
N-Carbonyl Aryldiazenes with Cyclopentadiene to Construct Cinnoline Derivatives: Azo-Povarov Reaction.
J Org Chem 2022;
87:11583-11592. [PMID:
35972474 PMCID:
PMC9447289 DOI:
10.1021/acs.joc.2c01224]
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Abstract
We disclose the first accomplishment of the azo-Povarov reaction involving Sc(OTf)3-catalyzed [4 + 2] annulations of N-carbonyl aryldiazenes with cyclopentadiene in chloroform, in which N-carbonyl aryldiazenes act as 4π-electron donors. Hence, this protocol offers a rapid access to an array of cinnoline derivatives in moderate to good yields for substrates over a wide scope. The synthetic potential of the protocol was achieved by the gram-scale reaction and further derivatization of the obtained polycyclic product.
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