The present invention provides a method for the preparation of a 4-halo-2'-nitrobutyrophenone compound having the structural formula I
which
comprises reacting a 2-nitrobenzoyl halide compound having the structural formula
wherein X and R are as described above with at least one molar equivalent of the magnesium enolate of acetyl-butyrolactone in the presence of a solvent at an elevated temperature and optionally concentrating the resultant reaction mixture by distillation of the solvent.
The formula I compound is an important intermediate in the manufacture of a sulfamoyl urea herbicidal agent.
本发明提供了一种具有结构式 I 的 4-卤代-2'-硝基
丁酮化合物的制备方法
其中
包括使具有结构式 I 的 2-硝基卤代苯甲酰基化合物反应
其中 X 和 R 如上所述,与至少一个摩尔当量的乙酰丁内酯
镁烯酸盐在溶剂存在下于高温下反应,并可选择通过蒸馏溶剂浓缩反应混合物。
式 I 化合物是生产
氨基磺酰基
脲除草剂的重要中间体。