Stereoselective synthesis of functionalized butenolides by the photochemical rearrangement of [2,1]benzisoxazolequinone derivatives

Article abstract of DOI:10.1016/S0040-4020(97)00058-6

On direct irradiation 3-alkoxy[2,1]benzisoxazolequinones 1a, 1b, 1c, 1e and 3-N,N-dimethylamino[2.1]benzisoxazolequinone 1d undergo rearrangement to the corresponding γ-cyano alkylidenebutenolides 3 in high yield. The reaction is highly stereoselective fo