4,6-dimethyl-3-oxo-2-phenyl-1,2,3,4,6,7-hexahydro-pyrano[4,3-c]pyrazole-7-carboxylic acid 、
硫酸二甲酯 在
sodium hydroxide 作用下,
生成 1,4,6-trimethyl-3-oxo-2-phenyl-1,2,3,4,6,7-hexahydro-pyrano[4,3-
c]pyrazole-7-carboxylic acid 、 1,4,6-trimethyl-3-oxo-2-phenyl-1,2,3,4,6,7-hexahydro-pyrano[4,3-
c]pyrazole-7-carboxylic acid methyl ester