试验发现，溶剂n, N -二甲基甲酰胺(DMF)的萃取效果优于二甲亚砜、乙腈及甲醇。

The extraction results showed that among the solvents, n, N-dimethylformamide (DMF) was better than dimethyl sulfoxide, ethyl cyanide and methanol.

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最后，凝结(四)2 -(4 -羟苯基)乙酰胺(五)的方式在氢氧化钾甲醇给人的理想产品。

Finally, condensation of (iv) with 2 - (4-hydroxyphenyl) acetamide (v) by means of KOH in MeOH gives the desired product.

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