乙酸酐 、
3-<(1E)-1,3-dimethylpent-1-enyl>-8,10-dihydroxy-7-methoxy-8-(2-oxopropyl)-1H-naphtho<2,3-c>pyran-9(8H)-one 在
吡啶 作用下,
以35%的产率得到3-<(1E)-1,3-dimethylpent-1-enyl>-8,9-dihydro-7-methoxy-9-oxo-8-(2-oxopropyl)-1H-naphtho<2,3-c>pyran-8,10-diyl diacetate