Abstract A novel rearrangement of 2 (5H)-furanones is described. When refluxed in aq. Ethanolic solution in the presence of excess KOH, the 2, 5-dihydro-2-oxofuran-3- carboxamides 6 underwent a novel rearrangement to the corresponding 4, 5-dihydro-4-oxo-
![4-[N-(p-chlorophenyl)amino]-2,5-dihydro-2-oxo-N-phenyl-3-furancarboxamide Structure](https://image.chemsrc.com/caspic/367/106212-59-3.png)
![[N-(trans-2-phenylcyclopropyl)amino]-4,5-dihydro-4-oxo-3-furancarboxylic acid Structure](https://image.chemsrc.com/caspic/187/103921-14-8.png)
![4-[(p-chlorophenyl)amino]-2,5-dihydro-2-oxo-N-(trans-2-phenylcyclopropyl)-3-furancarboxamide Structure](https://image.chemsrc.com/caspic/219/106212-50-4.png)