Ivanov KS, Samburskiy DE, Zargarova LV, Komarov VY, Mostovich EA. Construction of Annulated Spiro[4.4]-nonane-diones via the Tandem [4 + 2]-Cycloaddition/Aromatization Reaction.
J Org Chem 2023;
88:11003-11009. [PMID:
37462945 DOI:
10.1021/acs.joc.3c00981]
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Abstract
A method for the synthesis of both symmetric and asymmetric fused spiro[4.4]-nonane-dione derivatives has been developed. It is based on a Diels-Alder reaction of spiro[4.4]nona-2,7-diene-1,6-dione as a dienophile component followed by immediate aromatization of the adduct. An active diene component can be generated using the tetrabromoxylene/NaI system, the 1,3-diphenylisobenzofuran/BF3 system, or substituted cyclones.
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