1-(3,4-dimethoxyphenyl)-4-hydroxymethyl-4-methyl-3-pyrazolidinone 、
2-磺基苯甲酸酐 在
氮 、 ice water 、
乙腈 、
{1-(3,4-dimethoxyphenyl)-4-methyl-3-oxo-pyrazolidin-4-yl}methyl 2-sulphobenzoate 作用下,
以
四氢呋喃 为溶剂,
反应 24.0h,
以0.93 g (55%) of {1-(3,4-dimethoxyphenyl)-4-methyl-3-oxo-pyrazolidin-4-yl}methyl 2-sulfobenzoate (Compound IV) was isolated in the form of a pale yellow solid的产率得到{1-(3,4-dimethoxyphenyl)-4-methyl-3-oxo-pyrazolidin-4-yl}methyl 2-sulphobenzoate