Abstract
A simple and efficient procedure for the synthesis of 5-methyl-3,3′-dioxo-3H,3′H-spiro[furan-2,1′-isobenzofuran]-3,3′-dione derivatives, proceeding via a condensation reaction between ninhydrin and various 1,3-dicarbonyl compounds followed by oxidative cleavage of the corresponding 3a,8b-dihydroxy-2-methyl-4-oxo-4,8b-dihydro-3aH-indeno[1,2-b]furans is presented. The syntheses were carried out in water at room temperature and proceeded with short reaction times to give the products with high yields. The structural assignments were supported by IR, 1H NMR, 13C NMR, and mass spectrometry data.
Published Version
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