2β-(2',6'-dimethoxy-4'-methylbenzoyl)-3β-methoxycarbonyl-7-oxabicyclo<2.2.1>heptane 在
phenyltrimethylammonium tribromide 作用下,
以
四氢呋喃 为溶剂,
反应 5.0h,
以1.9 g的产率得到2α-bromo-2β-(2',6'-dimethoxy-4'-methylbenzoyl)-3β-methoxycarbonyl-7-oxabicyclo(2.2.1)heptane