Das A, Ajarul S, Debnath S, Hota P, Maiti DK. Bro̷nsted Acid-Catalyzed [5+1] and [4+1] Annulation of Cyclic Anhydrides with
o-Alkynylanilines to Construct Fused-N-Heterocycles.
J Org Chem 2023;
88:15073-15084. [PMID:
37876131 DOI:
10.1021/acs.joc.3c01525]
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Abstract
An unprecedented p-TsOH and MsOH-catalyzed construction of valuable isoindolo/pyrido/pyrrolo-quinolinediones and isoindolo-indolones is demonstrated through annulation reactions of cyclic anhydrides or o-formylbenzoates with o-alkynylanilines. The metal-free Bro̷nsted acid-mediated new [5+1] and [4+1] fused-cyclization is an operationally simple, highly regioselective, atom economical, high yielding, sustainable, and catalytically efficient approach.
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