dimethyl-4,4 oxo-2 hydroxyimino-6 (4,5, 7H) furo<3,4-b>pyranne 在
PPA 作用下,
反应 0.33h,
生成 5,5-Dimethyl-2-(3'-hydroxy-2'-oxo-2',5'-dihydrofuryl)-Δ2-oxazolin 、
4,4-Dimethyl-2,7-dioxo-2H,4H,5H,7H,8H-furo<3,4-f>-3,6-oxazepin 、 5,5-Dimethyl-3-(3'-hydroxy-2'-oxo-2',5'-dihydrofuryl)-Δ2-isoxazolin