作者:Akira Takeda、Eiichiro Amano、Sadao Tsuboi
DOI:10.1246/bcsj.50.2191
日期:1977.8
The reaction of ethyl 2-acetoxy-3-oxoheptanoate with γ-bromo-β-methoxy-cis-crotonate in the presence of sodium ethoxide afforded diethyl 3-methoxy-5-hydroxy-5-valeryl-2-hexenedioate (7) in 65% yield. Treatment of 7 with a dilute aqueous NaOH in acetone gave (±)-4-methoxy-6-valeryl-5,6-dihydro-2-pyrone, a key intermediate leading to pestalotin, in 41% yield.
在乙醇钠存在下,2-乙酰氧基-3-氧代庚酸乙酯与γ-溴-β-甲氧基-顺式巴豆酸酯反应,得到 3-甲氧基-5-羟基-5-戊酰基-2-己二酸二乙酯(7),收率为 65%。用丙酮中的稀 NaOH 水溶液处理 7,可得到(±)-4-甲氧基-6-缬氨酰-5,6-二氢-2-吡喃酮,收率为 41%。