(E)-4-[5-Oxo-2-(3-oxo-butyl)-tetrahydro-furan-2-yl]-but-2-enoic acid methyl ester 在
sodium methylate 作用下,
以
甲醇 为溶剂,
反应 4.0h,
生成 (5SR,7RS,8RS)-7-acetyl-8-methoxycarbonylmethyl-1-oxaspiro[4.4]nonan-2-one 、 (5SR,7SR,8SR)-7-acetyl-8-methoxycarbonylmethyl-1-oxaspiro[4.4]nonan-2-one 、 (5SR,7SR,8RS)-7-acetyl-8-methoxycarbonylmethyl-1-oxaspiro[4.4]nonan-2-one