(+/-)-methyl 3,4-O-isopropylidene-6-epishikimate 、
苯硫酚 在
sodium hydride 作用下,
生成
endo-3,4-isopropylidenedioxy-exo-2-phenylthio-6-oxabicyclo<3.2.1>octan-7-one 、 methyl 5α-hydroxy-3α,4α-isopropylidenedioxy-2β-phenylthiocyclohexan-1β-oate 、 methyl 5α-hydroxy-3α,4α-isopropylidenedioxy-2β-phenylthiocyclohexan-1α-carboxylate