98369-39-2Relevant academic research and scientific papers
REGIOSELECTIVE SYNTHESIS OF SUBSTITUTED PHTHALIDES VIA INTRAMOLECULAR "DIENE-REGENERATIVE" DIELS-ALDER REACTION OF 2-PYRONES
Noguchi, Michihiko,Kakimoto, Shinji,Kawakami, Hisao,Kajigaeshi, Shoji
, p. 1085 - 1088 (2007/10/02)
Some 2-pyrone-6-carboxylates bearing appropriate dienophiles in ester moieties underwent "diene-regenerative" Diels-Alder reaction to afford the dihydrophthalides, which were aromatized to phthalide derivatives in the presence of palladium-charcoal.In these reactions the substituents at 4 or 7-position of phthalides arose from those on yhe dienophile moieties in the starting 2-pyrones.
