methyl 5-(2',6'-dimethyl-6'-trifluoromethyl-4',4'-ethylenedioxy-1'-hydroxy-2'-cyclohexen-1'-yl)-3-methyl-2,4-pentadienoate 在
硫酸 作用下,
以
四氢呋喃 、
正己烷 、
乙酸乙酯 为溶剂,
以90%的产率得到methyl 5-(2',6'-dimethyl-6'-trifluoromethyl-4'-oxo-1'-hydroxy-2'-cyclohexen-1'-yl)-3-methyl-2,4-pentadienoate