Construction of Annulated Spiro[4.4]-nonane-diones via the Tandem [4 + 2]-Cycloaddition/Aromatization Reaction
Konstantin S Ivanov1, Denis E Samburskiy1, Leila V Zargarova1,2
1Laboratory of Low-carbon Chemical Technologies, ORËL Research Lab, Novosibirsk State University, Novosibirsk 630090, Russia.
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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