1-Cyclohexene-1-carboxaldehyde, 3-hydroxy-2-methyl- 、
4-hydroxy-6-(3,4-dimethoxyphenyl)-2-pyrone 在
L-脯氨酸 作用下,
以
乙酸乙酯 为溶剂,
生成 (5aR,6S)-3-(3,4-dimethoxyphenyl)-6-hydroxy-5a-methyl-6,7,8,9-tetrahydropyrano[4,3-b]chromen-1-one 、 (5aR,6R)-3-(3,4-dimethoxyphenyl)-6-hydroxy-5a-methyl-6,7,8,9-tetrahydropyrano[4,3-b]chromen-1-one