The base catalyzed ring expansion of 2-substituted 2H-1, 2-benzisoxazolin-3-one (3) to 2-substituted 2H-1, 3-benzoxazin-4-one (4) was observed during the alkylation of 3-hydroxy-1, 2-benzisoxazole (1).
在 3-羟基-1,2-苯并
异噁唑(1)的烷基化过程中,观察到 2-取代的 2H-1,2-苯并
异噁唑啉-3-酮(3)在碱催化下扩环为 2-取代的 2H-1,3-苯并
异噁唑-4-酮(4)。