、
乙酸酐 在
吡啶 作用下,
反应 4.0h,
生成 (5R,7S,8S)-5-methoxy-7-[(methylcarbonyloxy)methyl]-2,3,7,8-tetrahydro-5H-[1,4]dithiino[2,3-c]pyran-8-yl acetate 、
(5S,7S,8S)-5-methoxy-7-[(methylcarbonyloxy)methyl]-2,3,7,8-tetrahydro-5H-[1,4]dithiino[2,3-c]pyran-8-yl acetate