Furan → 4,7-Epoxy-1H-isoindole-1,3(2H)-dione, 3a,4,7,7a-tetrahydro-

Participants

Reaction Steps

A mixture of maleimide (Sigma-Aldrich, St. Louis Mo.; 2.0 g, 0.0206 moles) and furan (Sigma-Aldrich, St. Louis Mo.; 7.49 mL, 0.103 moles) in anhydrous ethyl ether (50 mL) was stirred for 70 hours at room temperature under an argon atmosphere. A white precipitate formed during the reaction and was filtered off and dried under reduced pressure giving 1.57 g of white crystals. NMR (d6-DMSO): Mixture of exo- and endo-isomers (37:63) of ETPI: Exo-3,6-Epoxy-1,2,3,6-tetrahydrophthalimide: 2.85 ppm (s, —CH, 2H), 5.25 ppm (s, —CH, 1H), 6.55 ppm (s, —CH═CH—, 2H), Endo-3,6-Epoxy-1,2,3,6-tetrahydrophthalimide: 3.48 ppm (s, —CH, 2H), 5.11 ppm (s, —CH, 2H), 6.49 ppm (s, —CH═CH, 2H).

Provenance & Evidence