In the presence of AlCl3, m-tolylthiomethyl chloride (1) reaceted with methyl 3, 4-dimetylcyclopent-3-ene-1-carboxylate (4) to give the [4++2] polar cycloadditino product 6, which was transformed into (±)-β-cuparenone (11) in 4 steps.
在
AlCl3 的存在下,间甲
硫基
甲基氯(1)与 3,4-二甲基环戊-3-烯-1-
甲酸甲酯(4)发生再乙酰化反应,得到[4++2]极性环二
酮类产物 6,并通过 4 个步骤将其转化为 (±)-β-cuparenone (11)。