4-((3-bromo-1-methyl-4-oxocyclohexa-2,5-dien-1-yl)oxy)but-2-yn-1-yl 4-methylbenzoate 在
silver hexafluoroantimonate 、 3,3'-bis[3,5-bis(trifluoromethyl)phenyl]-1,1'-binaphthyl-2,2'-diyl hydrogenphosphate 、
水 作用下,
以
1,2-二氯乙烷 为溶剂,
以41%的产率得到6-bromo-5-hydroxy-7a-methyl-9-oxo-2,3,3a,4,5,7a-hexahydro-3,5-ethanobenzofuran-3-yl 4-methylbenzoate