8-[3-(3-methyl-2-butenyl)-4-hydroxyphenyl]-2,2-dimethyl-3,4,7,8-tetrahydro-2H,6H-benzo[1,2-b:5,4-b']dipyran-6-one 在
甲酸 作用下,
反应 1.0h,
以10 mg的产率得到8-(2,2-dimethyl-3,4-dihydro-2H-1-benzopyran-6-yl)-2,2-dimethyl-3,4,7,8-tetrahydro-2H,6H-benzo[1,2-b:5,4-b']dipyran-6-one