Shekhar C, Satyanarayana G. Acid-Mediated Domino Cyclization of
ortho-Formyl Cinnamate Esters: Synthesis of Substituted Indene/Indane Esters and Indeno[
a]indenones.
J Org Chem 2024;
89:5069-5090. [PMID:
38497282 DOI:
10.1021/acs.joc.4c00301]
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Abstract
A Bro̷nsted acid-driven protocol to access substituted monoarylindene esters, biarylindane esters, and indeno[a]indenones from simple ortho-formylcinnamate esters and external arenes has been revealed. Remarkably, this single-pot process enabled the construction of two, three, and four new C-C bonds in building monoarylindene esters, biarylindane esters, and indeno[a]indenones, respectively, under metal-free and mild reaction parameters via triggering the inactive cinnamate ester moiety. In addition, the present strategy is investigated with widespread substrate scope.
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