Ganaie BA, Balasubramani A, Bhat BA, Mehta G. Indeno-Annulation of
o-Formyl-Ynones,
o-Bis-Ynones, and
p-Bis-
o-Formyl-Ynones with Dimethyl Acetone-1,3-Dicarboxylate: One Flask Cascade Synthesis of Functionally Endowed 9-Fluorenols and Indeno[1,2-
b]fluorenols.
J Org Chem 2023;
88:11637-11649. [PMID:
37558646 DOI:
10.1021/acs.joc.3c00958]
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Abstract
A mild, scalable, one-pot access to multifunctional 9-fluorenols from o-formyl-ynones and o-bis-ynones on reaction with dimethylacetone-1,3-dicarboxyate through tandem Michael addition-Aldol condensation cascade has been conceptualized and executed. The scope and utility of this synthetic approach have been further amplified for one-pot entry into functionally enhanced, higher order fluorenols like pentacyclic indeno[1,2-b]fluorene-6,12-diols and further to indeno[1,2-b]fluorene-6,12-diones through the implementation of "double indeno-annulation" tactic on p-bis-o-formyl ynones and dimethylacetone-1,3-dicarboxylate. Besides several green attributes, the current approach is also compatible with the emerging time and energy economy features and is a swift gateway to build complexity.
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