乙酸酐 、
3-Benzenesulfinyl-6-methyl-2-oxo-2,4,5,6-tetrahydro-benzofuran-6-carboxylic acid methyl ester 以
吡啶 为溶剂,
生成
(4S,6R)-4-Acetoxy-6-methyl-2-oxo-2,4,5,6-tetrahydro-benzofuran-6-carboxylic acid methyl ester 、 (4R,6R)-4-Acetoxy-6-methyl-2-oxo-2,4,5,6-tetrahydro-benzofuran-6-carboxylic acid methyl ester