(4Z,9Z)-5,7,9-Trihydroxy-6-((2S,6S)-6-methyl-tetrahydro-pyran-2-yl)-3,11-dioxo-trideca-4,9-dienedioic acid dimethyl ester 在
calcium acetate 作用下,
以
甲醇 为溶剂,
反应 2.5h,
生成
1,8-Dihydroxy-3-methoxycarbonylmethyl-7-((2S,6S)-6-methyl-tetrahydro-pyran-2-yl)-naphthalene-2-carboxylic acid methyl ester