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CHEMISTRY OF OXALYL DERIVATIVES OF METHYL KETONES. XXXIV. REACTION OF 5-ARYL-2,3-DIHYDROFURAN-2,3-DIONES WITH DISUBSTITUTED DIAZOALKANES
Andreichikov, Yu. S.,Gel't, N. V.
, p. 370 - 373 (2007/10/02)
With diphenyldiazomethane and diazofluorene aroylketenes, generated by the thermolysis of 5-aryl-2,3-dihydro-2,3-furandiones, form 3,3,5-trisubstituted 2-furanones, which are the products from the recyclization of the initially formed aroylcyclopropanones.The reaction of 5-aryl-2,3-dihydro-2,3-furandiones with the same diazoalkanes leads either to 3,3,6-substituted 2,4-pyrandiones or to 6,6,6a-trisubstituted 2,3-dioxo-2,3,6,6a-tetrahydro-5H-furopyrazoles.
