photochemical preparation of 5-, 6-, and 7-substituted chroman-4-ones from aryl 3-methyl-2-butenoate esters is described. The two-phase base-catalyzed method relies upon two consecutive processes in one-pot reaction through a photo-Fries rearrangement and a based-catalyzed intramolecular oxa-Michael addition to afford the desired products.
描述了由3-甲基-
2-丁烯酸酯芳基酯容易地光
化学制备5-,6-和7-取代的
吡喃-4-酮的方法。两相碱催化方法依靠一锅反应中的两个连续过程,通过光-弗里斯重排和碱催化的分子内氧杂-迈克尔加成反应得到所需的产物。